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Journal articles on the topic 'Barium Manganite'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Sardjono, Priyo, and Wisnu Ari Adi. "Thermal Analysis and Magnetic Properties of Lanthanum Barium Manganite Perovskite." Advanced Materials Research 896 (February 2014): 381–84. http://dx.doi.org/10.4028/www.scientific.net/amr.896.381.

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The lanthanum manganite is the family of magnetic materials which had the magnetic properties are varied depend on the composition. This study has been carried out synthesis and characterization of thermal and magnetic properties of the lanthanum barium manganite perovskite. The perovskite material is prepared by oxides, namely La2O3, BaCO3, and MnCO3. The mixture was milled for 10h and then sintered at temperature of 1000 °C for 10h. Thermal analysis and magnetic properties are measured by differential thermal analysis (TG-DTA) and vibrating sample magnetometer (VSM), respectively. Decomposition phase of MnCO3become MnO occurred at temperatures around 390 °C with releasing in CO2. Since lanthanum manganite has a stable ion configuration, magnetic properties of these systems are built from MnO phase transformation become α-Mn2O3is arrayed anti-ferromagnetic due to the presence of lanthanum in the system. And this anti-ferromagnetic behavior occurred due to magnetic interactions between Mn3+adjacent ions through super-exchange mechanism. While lanthanum barium manganite had a less stable ion configuration, therefore magnetic properties of these systems are built from phase transformation MnO become α-Mn3O4is arrayed ferromagnetic due to the presence of lanthanum and barium in this system. The presence of lanthanum and barium trigger in the emergence of mixed-valence Mn ions, so that occur to magnetic interaction between Mn3+and Mn4+through the double-exchange mechanism. We concluded that the characteristic of magnetic properties on the lanthanum barium manganite system perovskite is affected by thermal properties, fundamental properties of raw material and the result of reaction is formed.

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2

Nagabhushana, B. M., R. P. Sreekanth Chakradhar, K. P. Ramesh, V. Prasad, C. Shivakumara, and G. T. Chandrappa. "Magnetoresistance studies on barium doped nanocrystalline manganite." Journal of Alloys and Compounds 450, no. 1-2 (February 2008): 364–68. http://dx.doi.org/10.1016/j.jallcom.2006.10.162.

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3

Kassenov, B. K., Sh B. Kassenova, Zh I. Sagintaeva, E. E. Kuanyshbekov, and M. O. Turtubaeva. "Calorimetric Research into the Heat Capacity of Novel Nano-Sized Cobalt(Nickelite)-Cuprate-Manganites of LaBaMeIICuMnO6 (MeII = Co, Ni) and their Thermodynamic Properties." Eurasian Chemico-Technological Journal 22, no. 1 (March 26, 2020): 27. http://dx.doi.org/10.18321/ectj927.

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The isobaric heat capacities of novel nano-sized cobalt-cuprate-manganite of lanthanum and barium LaBaCoCuMnO6 and nickel-cuprate-manganite of lanthanum and barium LaBaNiCuMnO6 were investigated by dynamic calorimetry over the temperature range of 298.15‒673 K. It is found that a λ-shaped effect is observed on the curve of the heat capacity dependence on temperature of LaBaCoCuMnO6 at 523 K, while LaBaNiCuMnO6 also has a similar effect at 473 K. Equations for the temperature dependence of the heat capacity of cobalt(nickelite)-cuprate-manganite of lanthanum and barium are derived with allowance for the temperatures of phase transitions. Based on the experimental data, the fundamental constants ‒ the standard heat capacities of the compounds under study were found. Irrespective of the experimental data, we also calculated the standard heat capacities of the mentioned compounds using the Debye theory using the characteristic temperatures of the elements, their melting points, the Koref and Nernst-Lindemann equations. The obtained calculated data on C0p (298.15) of the compounds were in satisfactory agreement with the experimental data on the standard heat capacity. The standard entropies of LaBaCoCuMnO6 and LaBaNiCuMnO6 were calculated by the ion increment method. We calculated the temperature dependences of the enthalpy Ho(T)- Ho(298.15), entropy ΔSo(T), and the reduced thermodynamic potential ΔФ**(Т).

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4

Mandal, Tapas Kumar, Litty Sebastian, J. Gopalakrishnan, Lloyd Abrams, and J. B. Goodenough. "Hydrogen uptake by barium manganite at atmospheric pressure." Materials Research Bulletin 39, no. 14-15 (December 2004): 2257–64. http://dx.doi.org/10.1016/j.materresbull.2004.08.009.

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5

Simon, Jürgen, Thomas Walther, and Werner Mader. "Barium diffusion and calcium segregation in manganite thin films." Microscopy and Microanalysis 9, S03 (September 2003): 268–69. http://dx.doi.org/10.1017/s1431927603023262.

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6

Chakraborty, Amitava, P. Sujatha Dévi, and H. S. Maiti. "Low temperature synthesis and some physical properties of barium-substituted lanthanum manganite (La1−x BaxMnO3)." Journal of Materials Research 10, no. 4 (April 1995): 918–25. http://dx.doi.org/10.1557/jmr.1995.0918.

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Barium-substituted lanthanum manganite (La1−xBaxMnO3) powders have been synthesized by a novel autoignition technique, and the effect of barium content on the autoignition characteristics, stability of the compound, and the powder characteristics have been investigated. X-ray examinations show that the material exists as a single phase having perovskite structure up to 40 at. % substitution of Ba for La, beyond which mixed phases of LaMnO3 and BaMnO3 are formed at least up to the highest limit of substitution (50 at. %) and calcination temperature (1350 °C) investigated. Electrical conductivity and thermal expansion behavior of the material have been studied for plausible use as cathode material in solid oxide fuel cells.

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7

Zinzuvadiya, Sushant, Rutvi J. Pandya, Jitendra Singh, and U. S. Joshi. "Low field magnetotransport behavior of barium hexaferrite/ferromagnetic manganite bilayer." Journal of Applied Physics 130, no. 2 (July 14, 2021): 024102. http://dx.doi.org/10.1063/5.0055741.

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8

Bhavani, Annabathini Geetha, Won Yong Kim, and Jae Sung Lee. "Barium Substituted Lanthanum Manganite Perovskite for CO2 Reforming of Methane." ACS Catalysis 3, no. 7 (June 13, 2013): 1537–44. http://dx.doi.org/10.1021/cs400245m.

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9

Zhou, Ling, Chi Chen, Qiuyun Fu, Dongxiang Zhou, Fei Xue, Yahui Tian, Mingzhi Zhang, Geng Wang, and Mei Wang. "Asymmetry induced intrinsic magnetodielectric effects in manganite – Barium titanate solid solutions." Journal of Magnetism and Magnetic Materials 468 (December 2018): 168–74. http://dx.doi.org/10.1016/j.jmmm.2018.07.069.

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10

Shukla, Jyoti, and Ashutosh Mishra. "Study of structural, dielectric, and modulus behaviour of barium modified YMnO3 manganite." Materials Today: Proceedings 46 (2021): 2189–92. http://dx.doi.org/10.1016/j.matpr.2021.03.122.

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11

Legchenkova, I. V., A. I. Prokhvatilov, Yu E. Stetsenko, and K. A. Yagotintsev. "X-ray studies of barium manganite Ba6Mn24O48 in the magnetic transition region." Low Temperature Physics 42, no. 2 (February 2016): 149–51. http://dx.doi.org/10.1063/1.4942583.

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12

Bichurin, M. I., and V. M. Petrov. "Modeling of Magnetoelectric Interaction in Magnetostrictive-Piezoelectric Composites." Advances in Condensed Matter Physics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/798310.

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The paper dwells on the theoretical modeling of magnetoelectric (ME) effect in layered and bulk composites based on magnetostrictive and piezoelectric materials. Our analysis rests on the simultaneous solution of elastodynamic or elastostatic and electro/magnetostatic equations. The expressions for ME coefficients as the functions of material parameters and volume fractions of components are obtained. Longitudinal, transverse, and in-plane cases are considered. The use of the offered model has allowed to present the ME effect in ferrite cobalt-barium titanate, ferrite cobalt-PZT, ferrite nickel-PZT, and lanthanum strontium manganite-PZT composites adequately.

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13

Repi, Viktor Vekky Ronald, Azwar Manaf, and Bambang Soegiono. "Microwave Properties of Composite Ba_0.5Sr_0.5Fe_11.7Mn_0.15Ti_0.15O₁₉/La_0.7Ba_0.3MnO₃ Material." Advanced Materials Research 896 (February 2014): 440–43. http://dx.doi.org/10.4028/www.scientific.net/amr.896.440.

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Mn-Ti substituted Barium - Strontium Hexaferrite and Barium – Lanthanum Manganite both well established materials which have been shown poses microwave absorbtion properties. As the properties of composite system are a composition sensitive, composite materials must be properly designed to meet a specific application. In this paper, we report our recent investigation on microwave absorbtion properties of composite Ba0.5Sr0.5Fe11.7Mn0.15Ti0.15O19/La0.7Ba0.3MnO3system. Composite components respectively Ba0.5Sr0.5Fe11.7Mn0.15Ti0.15O19and La0.7Ba0.3MnO3were prepared through mechanical alloying route employing a planetary ball mill for 20 hrs. The two milled powders were sintered at a temperature 1100 °C for 10 hours to ensure the crystallization towards fully crystalline materials. Composites with 2 different compositions were studied by FTIR and VNA from which results were compared with that of each component. Results of the investigation concluded that, the composite of Ba0.5Sr0.5Fe11.7Mn0.15Ti0.15O19/La0.7Ba0.3MnO3system is a good microwave absorbing material in the frequency range 9 GHz-15 GHz, particularly, sample with coded A03B07 has a wide range frequencies absorption.

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14

Ellouze, M., W. Boujelben, A. Cheikhrouhou, H. Fuess, and R. Madar. "Structure, ferromagnetism and magnetotransport properties in the barium-deficient Pr0.7Ba0.2□0.1MnO3 manganite oxides." Journal of Magnetism and Magnetic Materials 257, no. 2-3 (February 2003): 319–26. http://dx.doi.org/10.1016/s0304-8853(02)01229-5.

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15

Hayat, Khizar, M. Javid Iqbal, Kamran Rasool, and Yaseen Iqbal. "Device fabrication and dc electrical transport properties of barium manganite nanofibers (BMO-NFs)." Chemical Physics Letters 616-617 (November 2014): 126–30. http://dx.doi.org/10.1016/j.cplett.2014.10.046.

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16

Jin, K. X., B. Yang, Y. Zhang, B. C. Luo, L. Y. Chen, and C. L. Chen. "Tunable dielectric properties induced by optical fields in barium strontium titanate/manganite heterostructures." Scripta Materialia 112 (February 2016): 62–66. http://dx.doi.org/10.1016/j.scriptamat.2015.09.012.

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17

Rahmouni, H., B. Cherif, K. Khirouni, M. Baazaoui, and S. Zemni. "Influence of polarization and iron content on the transport properties of praseodymium–barium manganite." Journal of Physics and Chemistry of Solids 88 (January 2016): 35–40. http://dx.doi.org/10.1016/j.jpcs.2015.09.011.

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18

Zheng, Minghao, Shuang Wang, Yi Yang, and Changrong Xia. "Barium carbonate as a synergistic catalyst for the H2O/CO2 reduction reaction at Ni–yttria stabilized zirconia cathodes for solid oxide electrolysis cells." Journal of Materials Chemistry A 6, no. 6 (2018): 2721–29. http://dx.doi.org/10.1039/c7ta08249e.

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BaCO₃ is primarily demonstrated as an excellent synergistic catalyst for efficient electro-reduction of H₂O/CO₂ to H₂/CO at the state-of-the-art Ni–YSZ cathodes for solid oxide electrolysis cells with YSZ electrolytes and strontium doped lanthanum manganite oxygen electrodes.

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19

Hayat, Khizar, M. A. Rafiq, Atta ur Rahman, Abid Ali Khan, and M. M. Hasan. "Size-manipulation, compaction and electrical properties of barium manganite nanorods synthesized via the CHM method." Progress in Natural Science: Materials International 23, no. 4 (August 2013): 388–94. http://dx.doi.org/10.1016/j.pnsc.2013.06.016.

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20

Sfifir, I., H. Ben Khlifa, W. Cheikhrouhou-Koubaa, M. Koubaa, and A. Cheikhrouhou. "Vacancy effect in both calcium and barium on the physical properties of La0.6Ca0.2Ba0.2MnO3 polycrystalline manganite." Journal of Alloys and Compounds 693 (February 2017): 782–91. http://dx.doi.org/10.1016/j.jallcom.2016.09.257.

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21

Galca, Aurelian Catalin, Marwène Oumezzine, Aurel Leca, Cristina Florentina Chirila, Victor Kuncser, Andrei Kuncser, Corneliu Ghica, Iuliana Pasuk, and Mohamed Oumezzine. "Structure, transition temperature, and magnetoresistance of titanium-doped lanthanum barium manganite epilayers onto STO 001 substrates." Applied Physics Letters 111, no. 18 (October 30, 2017): 182409. http://dx.doi.org/10.1063/1.4998011.

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22

Ovsyannikov, G. A., T. A. Shaikhulov, V. A. Shakhunov, V. V. Demidov, N. V. Andreev, A. E. Pestun, and V. L. Preobrazhenskii. "Effect of the stresses caused by substrate on the electrical conductivity of ferromagnetic manganite lanthanum–barium films." Physics of the Solid State 59, no. 11 (November 2017): 2198–202. http://dx.doi.org/10.1134/s1063783417110245.

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23

Smitha, M. G., and M. V. Murugendrappa. "Effect of barium lanthanum manganite nano particle on the electric transport properties of polypyrrole at room temperature." Journal of Materials Science: Materials in Electronics 30, no. 11 (May 7, 2019): 10776–91. http://dx.doi.org/10.1007/s10854-019-01421-x.

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24

Osinkin, Denis A., Anna V. Khodimchuk, Natalia M. Porotnikova, Nina M. Bogdanovich, Andrey V. Fetisov, and Maxim V. Ananyev. "Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ." Energies 13, no. 1 (January 3, 2020): 250. http://dx.doi.org/10.3390/en13010250.

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The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6−δ was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (rH) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18O fraction using Ezin’s model. The rates of oxygen dissociative adsorption (ra) and incorporation (ri) were calculated based on a model using the three exchange type rates. It has been established that the rates ra and ri were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient (k) of Sr2Fe1.5Mo0.5O6−δ is comparable to that of La0.6Sr0.4MnO3±δ oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6−δ. The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.

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25

Firouzabadi, Habib, Babak Karimi, and Mohammad Abbassi. "Efficient Solvent-free Oxidation of Benzylic and Aromatic Allylic Alcohols and Biaryl Acyloins by Manganese Dioxide and Barium Manganate." Journal of Chemical Research 23, no. 3 (March 1999): 236–37. http://dx.doi.org/10.1177/174751989902300333.

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26

Rahman, Ikhwan Nur, Budhy Kurniawan, Dhawud Sabilur Razaq, Arief Sudarmaji, and Dicky Rezky Munazat. "Structural and Morphological La_0.85-xBa_xNa_0.15MnO₃ (x = 0, 0.05, 0.10 and 0.15) Perovskite Manganite." Key Engineering Materials 860 (August 2020): 95–100. http://dx.doi.org/10.4028/www.scientific.net/kem.860.95.

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Bulk polycrystalline samples La0.85-xBaxNa0.15MnO3 (x = 0, 0.05, 0.10 and 0.15) manganites were synthesized by the sol-gel route. The effect of Barium (Ba) existence on the structural and morphological was investigated by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The structural parameters were obtained using Rietveld refinement of the XRD pattern. It was revealed the structures of compounds have rhombohedral with R-3c space group without any impurities phase. Furthermore, several changes are found to exist due to Ba substitution such as the lattice parameter, unit cells volume, average crystallite size, average Mn-O bond length (<Mn – O>) and average Mn-O-Mn bond angle (<Mn – O – Mn>). The changes in <Mn – O> and <Mn – O – Mn> due to Ba substitution, affects the double exchange interaction of the samples. SEM images reveal the existence of Ba also affects the morphology of the studied samples, which consisted of polygonal grains with homogeneous chemical composition.

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27

Voulgaropoulos, Anastasios N., and Soulis Th. "Teneurs de certains vins grecs du commerce en lithium, potassium, sodium, magnésium, calcium, strontium, baryum, manganèse, fer et aluminium." OENO One 21, no. 1 (March 31, 1987): 23. http://dx.doi.org/10.20870/oeno-one.1987.21.1.1276.

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<p style="text-align: justify;">Les auteurs ont déterminé, dans quelques vins grecs, les teneurs en lithium, potassium, sodium, magnésium, calcium, strontium, baryum, manganèse, fer et aluminium par spectrométrie d'émission à plasma (ICP). Les valeurs trouvées sont de même ordre de grandeur que celles données pour d'autres vins européens.</p><p style="text-align: justify;">+++</p><p style="text-align: justify;">The content of 22 commercial greek wines in Lithium, Sodium, Potassium, Magnesium, Calcium, Iron, Manganese, Strontium, Aluminium and Barium has been determineed using ICP, after acid digestion in quartz crucibles. The concentrations of the above metals were varied in levels similar to those of other European wines.</p>

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28

Oumezzine, Marwène, Sami Kallel, Octavio Peña, Nabil Kallel, Thierry Guizouarn, Francis Gouttefangeas, and Mohamed Oumezzine. "Correlation between structural, magnetic and electrical transport properties of barium vacancies in the La0.67Ba0.33−x□xMnO3 (x=0, 0.05, and 0.1) manganite." Journal of Alloys and Compounds 582 (January 2014): 640–46. http://dx.doi.org/10.1016/j.jallcom.2013.08.011.

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29

CARDONA-VÁSQUEZ, J. A., M. E. GÓMEZ, D. A. LANDÍNEZ-TÉLLEZ, and J. ROA-ROJAS. "STUDY OF BIFERROIC PROPERTIES IN THE La0.37Ca0.17Ba0.43Mn0.52Ti0.44Zr0.04O3 COMPLEX PEROVSKITE." Modern Physics Letters B 27, no. 27 (October 15, 2013): 1350200. http://dx.doi.org/10.1142/s021798491350200x.

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In this paper, details of synthesis and structural, morphological, electrical, and magnetic characterization of the new La 0.37 Ca 0.17 Ba 0.43 Mn 0.52 Ti 0.44 Zr 0.04 O 3 multiferroic complex perovskite are reported. Mixtures with 50% mass of ferromagnetic lanthanum calcium manganite La 0.67 Ca 0.33 MnO 3 and ferroelectric barium-lanthanum zirconate titanate Ba 0.9 La 0.067 Ti 0.91 Zr 0.09 O 3 were prepared by the solid state reaction technique. Patterns of X-ray diffraction showed that the materials have reacted resulting in a new perovskite-like structure with tetragonal symmetry, space group P4mm(#99). The structure of the material was refined using the Rietveld method through the GSAS code. ZFC and FC magnetization curves show the occurrence of two phase transitions at 42.25 K and 203.9 K which have been associated with two different magnetic regimes. Hysteresis curves measured confirm that the relationship between the applied field and the magnetization does not evidence a linear behavior. These curves also show that in the low temperature regime the magnetic memory of the material is greater than in the high temperature region. AC impedance as a function of temperature measurements show the same two regions observed in the magnetization curves. The ferroelectric behavior with relative permittivity of 153.12 is observed by polarization curves performed at room temperature in the synthesized materials.

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30

Nokhrina, O. I., I. D. Rozhikhina, V. I. Dmitrienko, I. E. Proshunin, and M. A. Golodova. "Peculiarities of application of natural and man-caused materials for steel alloying and modifying." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 8 (September 6, 2019): 944–54. http://dx.doi.org/10.32339/0135-5910-2019-8-944-954.

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Considerable reserves of improvement of steel quality and reduction of costs of its production are concealed in a possibility of active and purposeful formation their structure and the properties by introduction into the melt modifiers, alloying and microalloying additives. Due to the task of decreasing costs, studies on alloying and modifying of metal by natural and man-caused materials are very actual. Thermodynamic regularities of steel alloying and modifying processes by natural and man-caused materials, including manganese ores of various structures, BOF vanadium slag, barium- strontium modifier, obtained from the complex ores containing barium and strontium considered. Possibilities of wide application of various structure manganese ores for steel alloying by manganese without use of standard manganese alloys as well as vanadium slag for microalloying by vanadium demonstrated. Metallurgical properties barium-strontium natural modifier obtained and the possible mechanism of the modifying impact of barium and strontium on quality of metal studied. It was determined, that the effect of modifying by barium can revealed in steels, deoxidized only by silicon, and for modifying by strontium or joint modifying by barium and strontium it is necessary to apply aluminum as deoxidizing agent. Industrial testing of the above-stated materials showed reliability of studies, accomplished at thermodynamic modeling and laboratory studies of calculations and conclusions. Recommendations on optimization of technologies of steel alloying and modifying made. It was proved that use of the materials of the study allows to improve technical and economic indices of the process of production of steels and to increase considerably quality of final steel products. Conclusions on significant expansion of natural and man-caused materials prospects worded.

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31

Jenssen, Jon, and Tore Syversen. "Effects of High Pressure and Metal Salts on Cell Growth." Alternatives to Laboratory Animals 19, no. 2 (April 1991): 245–49. http://dx.doi.org/10.1177/026119299101900218.

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The effects of chromate, vanadate, nickel, manganese, copper and barium, both separately and in combination with high pressure helium gas, have been studied in an epithelial-like cell line — Chinese hamster ovary (CHO) cells, using inhibition of cell growth as the cytotoxic endpoint. High pressure (175 bar) by itself reduced the net growth of CHO cells to 71.7 ± 5.5% (mean ± SD) of normobaric control growth. The combined effects of high pressure and metal salts were additive for the lowest concentrations of chromate, copper, manganese and barium, more than additive for the lowest concentration of nickel, and less than additive for vanadate and the highest concentrations of chromate, copper, manganese and barium. A ranking of the normobaric growth inhibition of the metal salts, estimated as the concentration giving 50% inhibition, was Cr>V>Mn>Ni>Cu>Ba. The growth inhibition of barium was less than 50% at a concentration of ImM BaCl2. The combined exposure to high pressure and the metal salt did not change the toxicity ranking.

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32

Pavlova, K. P., I. A. Solizoda, and Denis Vinnik. "Synthesis, Structure and Properties of Barium Ferrites BaFe<sub>11</sub>M<sub>1</sub>O19 (M= Al, Ti and Mn) Ceramics." Materials Science Forum 1052 (February 3, 2022): 172–77. http://dx.doi.org/10.4028/p-3uh7h3.

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The article shows the results of a research in which barium hexaferrite samples of the BaFe11M1O19 (M= Al, Ti and Mn) composition were obtained by solid-state synthesis. Samples substituted with titanium, aluminum, and manganese were obtained in a tubular furnace at an exposure time of 5 hours at a temperature of 1350°C, the sample, substituted with manganese, it was obtained at a temperature of 1250°C. The chemical composition was controlled using electron microscopy the samples obtained correspond to the initial composition with sufficient accuracy. Hexagonal plates represent the structure of all the obtained samples. According to X-ray phase analysis, all samples are monophasic and have the structure of barium hexaferrite. Using the data of powder X-rays, the parameters of the unit cell of the studied samples were calculated, when iron atoms are substituted by titanium or aluminum or manganese atoms, the crystal lattice is distorted, while its change is not the same for different crystallographic directions. During the doping of barium hexaferrite with titanium, aluminum or manganese atoms, the Curie temperature decreases. This is due to a decrease in the exchange interaction forces during the modification of the barium hexaferrite matrix. The aim of this study was to study the structure and change of the lattice parameters, the Curie temperature, depending on the substitution element.

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33

Pookmanee, Pusit, P. Ketwong, and Sukon Phanichphant. "BaMnTiO₃Synthesized by the Oxalate and Impregnation Methods." Advanced Materials Research 55-57 (August 2008): 81–84. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.81.

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Barium titanate (BaTiO3) was synthesized by the oxalate method with the starting precursors as barium chloride and potassium titanium oxalate with mole ratio of 1:1. Precipitate was obtained after adding oxalic acid until the pH of the final solution was 4. The precipitate was milled and calcined at 700 oC for 2h. Mn-doped barium titanate (BaMnTiO3) was prepared by the impregnation method. Barium titanate calcined at 700 oC was mixed with 2 and 4 mole % of Mn from manganese chloride. The mixed powder was calcined at temperatures of 800 oC and 900 oC for 2h. The phase of BaMnTiO3 was studied by X-ray diffraction (XRD). Hexagonal structure of Ba(Mn0.33Ti0.67)O2.84 was obtained after calcination at 900 oC for 2h with 2 and 4 mole % of Mn. The morphology and chemical composition were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The particle size of Ba(Mn0.33Ti0.67)O2.84 powder was in the range of 50-60 nm with irregular in shape. The elemental composition of barium, manganese, titanium and oxygen showed the characteristic X-ray energy values.

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34

Mojtahedi, Mohammad M., Ali Sharifi, Sharif Kaamyabi, and Mohammad R. Saidi. "Efficient and Practical Solvent-Free Oxidation of Alcohols using Microwave Irradiation." Journal of Chemical Research 2002, no. 6 (June 2002): 286–87. http://dx.doi.org/10.3184/030823402103172004.

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35

Al-Najar, Anis A., and Awatif M. Ibrahim. "The audio frequency conductances of magnesium, manganese II, and barium malonates in aqueous medium at 25 °C." Canadian Journal of Chemistry 68, no. 5 (May 1, 1990): 770–73. http://dx.doi.org/10.1139/v90-121.

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The conductance of aqueous solutions of magnesium, manganese II, and barium malonates has been measured at 1.59 kHz, using a conventional audio frequency bridge. Conductance data were evaluated using different modern theoretical conductance equations, each a three-parameter equation in KA, Λ0, and a. These are the complete and expanded forms of both the Fuoss–Hsia (F/H) and Pitts (P) equations and the Lee–Wheaton (L/W) equation. Our results show that the Lee–Wheaton equation is the most satisfactory. Keywords: conductance, aqueous medium, magnesium malonate, manganese malonate, barium malonate.

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36

Ilmiawati, Cimi, Nguyen Dinh Thang, Machiko Iida, Masao Maeda, Shoko Ohnuma, Ichiro Yajima, Nobutaka Ohgami, et al. "Limited effectiveness of household sand filters for removal of arsenic from well water in North Vietnam." Journal of Water and Health 14, no. 6 (October 4, 2016): 1032–40. http://dx.doi.org/10.2166/wh.2016.254.

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Since well water utilized for domestic purposes in the Red River Delta of North Vietnam has been reported to be polluted by arsenic, barium, iron, and manganese, household sand filters consisting of various components are used. Information regarding the effectiveness of various sand filters for removal of the four toxic elements in well water is limited. In this study, arsenic levels in 13/20 of well water samples and 1/7 of tap water samples exceeded World Health Organization (WHO) health-based guideline value for drinking water. Moreover, 2/20, 6/20, and 4/20 of well water samples had levels exceeding the present and previous guideline levels for barium, iron, and manganese, respectively. Levels of iron and manganese, but not arsenic, in well water treated by sand filters were lower than those in untreated water, although previous studies showed that sand filters removed all of those elements from water. A low ratio of iron/arsenic in well water may not be sufficient for efficient removal of arsenic from household sand filters. The levels of barium in well water treated by sand filters, especially a filter composed of sand and charcoal, were significantly lower than those in untreated water. Thus, we demonstrated characteristics of sand filters in North Vietnam.

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Accorsi, Gianluca, Giovanni Verri, Angela Acocella, Francesco Zerbetto, Giovanni Lerario, Giuseppe Gigli, David Saunders, and Rachel Billinge. "Imaging, photophysical properties and DFT calculations of manganese blue (barium manganate(vi) sulphate) – a modern pigment." Chem. Commun. 50, no. 97 (2014): 15297–300. http://dx.doi.org/10.1039/c4cc01986e.

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38

Yuan, Quan, Wang Qun, Zhi Xue Qu, Zi Xin Gu, and Tong Wu. "Preparation and Electromagnetic Properties of Manganese Zinc Ferrite/Barium Ferrite Composite Materials." Key Engineering Materials 519 (July 2012): 215–19. http://dx.doi.org/10.4028/www.scientific.net/kem.519.215.

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Abstract: Manganese zinc ferrite/barium ferrite composite materials were prepared with various content of Z type barium ferrite (0, 10, 20 wt%) using solid state reaction method. The effect of the compositon on the microstructure and electromagnetic properties of the composites are investigated by means of X-ray diffraction, scanning electron microscope and impedance analyzer. The X-ray diffraction patterns reveal that W phase of barium ferrite instead of Z phase appears in the composite sintered as well as the spinel phase. Some small hexagonal grains were observed in the SEM images and the proportion increases with increasing content of barium ferrite. The cut-off frequencies of the composite systematically shift towards high frequency from 2.5 MHz to 32.6 MHz which is attributed to the increasing of W phase. The composites show a higher frequency for the maximum of the impedance as well as a higher value of the impedance at certain frequency which may be benefit for the application at GHz frequency range.

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39

Avigliano, Esteban, Barbara Carvalho, Gonzalo Velasco, Pamela Tripodi, Marcelo Vianna, and Alejandra Vanina Volpedo. "Nursery areas and connectivity of the adults anadromous catfish (Genidens barbus) revealed by otolith-core microchemistry in the south-western Atlantic Ocean." Marine and Freshwater Research 68, no. 5 (2017): 931. http://dx.doi.org/10.1071/mf16058.

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The anadromous catfish, Genidens barbus, is a commercial and vulnerable species from South America. The aims of the present study were to assess whether the nursery areas can be discriminated by using microchemical signatures of lapillus otoliths, to assess the accuracy of classifying fish in relation to natal nursery area and to discuss the possibility of existence of homing behaviour. Thus, the otolith-core chemical signatures (barium (Ba):calcium (Ca), lithium (Li):Ca, magnesium (Mg):Ca, manganese (Mn):Ca, strontium (Sr):Ca, and zinc (Zn):Ca ratios) of adult fish were compared among different estuaries (De La Plata River in Argentina, and Patos Lagoon, Paranaguá Bay and Guanabara Bay in Brazil). PERMANOVA analysis showed significant differences in the multi-element signatures of the otolith core among sampling sites for all cohorts (2002, 2003, 2006 and 2007), indicating that the technique has considerable potential for use in future assessments of population connectivity and nursery areas of G. barbus. Via quadratic discriminant function analysis, fish were classified to natal nursery areas with 80–100% cross-validation classification accuracies. These results suggested that a high level of spatial segregation exists in adult catfish life and homing behaviour could not be ruled out on the basis of our data.

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Assoud, Abdeljalil, Bryan A. Kuropatwa, and Holger Kleinke. "Barium manganese(II) selenostannate(IV), BaMnSnSe4." Acta Crystallographica Section E Structure Reports Online 67, no. 12 (November 16, 2011): i72. http://dx.doi.org/10.1107/s1600536811047283.

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41

Belous, Anatolii G., E. D. Solovyova, S. O. Solopan, O. V. Yelenich, L. N. Bubnovskaya, and S. P. Osinsky. "Properties and Potential Applications of Ferromagnetic Nanostructures in Medicine and Microwave Engineering." Solid State Phenomena 230 (June 2015): 95–100. http://dx.doi.org/10.4028/www.scientific.net/ssp.230.95.

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Three types of ferromagnetic nanostructures based on barium hexaferrite (BaFe12O19), lanthanum-strontium manganites with perovskite structure ((La,Sr)MnO3) and materials with spinel structure (AFe2O4, A = Ni, Zn, Co, Mn, Fe) have been synthesized by precipitation from aqueous and nonaqueous solutions, by the sol-gel method and from microemulsions. Magnetic properties of the synthesized nanoparticles and films have been investigated. It was shown that the obtained nanoparticles exhibit superparamagnetic properties. It has been found that the synthesized nanoparticles have promise in hyperthermia of cancer cells. It has been shown that the films based on barium hexaferrite can have promise in the creation of nonlinear resonant microwave elements on the basis of high-Q dielectric resonators and ferromagnetic films.

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Zhang, Dong. "Pre-Concentration Capability for Trace Heavy Metal Ions with Manual-Controlled Injection Porous Nano-Barium-Strontium Titanate Microspheres Enricher." Advanced Materials Research 433-440 (January 2012): 689–92. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.689.

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The micro-column packed with porous nano-barium- strontium titanate microspheres, joining with injector, a new manual-controlled injection porous nano-barium- strontium titanate microspheres enricher (PBSTME) was prepared. The enrichment capability of the PBSTME for the heavy metal ions, such as zinc, nickel, copper, manganese, cobalt and silver was investigated. The results showed that all the heavy metals studied could be quantitatively retained by the PBSTME in the pH range of 5–8, and then eluted completely with 2 mol•L-1 HNO3. The detection limits of this method for zinc, nickel, copper, manganese, cobalt and silver ions were 0.028 μg•L-1, 0.2μg•L-1, 0.031 μg•L-1, 0.022 μg•L-1, 0.057μg•L-1 and 0.039 μg•L-1 with an enrichment factor of 50, respectively. A new method has been developed for the determination of trace heavy metal ions based on pre-concentration with a PBSTME prior to their determination by flame atomic absorption spectrometry. The method has been applied to the simultaneous determination of trace amounts of zinc, nickel, copper, manganese, cobalt and silver ions in water sample with satisfactory results.

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Memarian, Hamid R., Majid M. Sadeghi, and Ahmad R. Momeni. "AROMATIZATION OF HANTZSCH 1,4-DIHYDROPYRIDINES USING BARIUM MANGANATE." Synthetic Communications 31, no. 15 (January 2001): 2241–44. http://dx.doi.org/10.1081/scc-100104821.

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Molnár, Vanda. "Elemental concentration in deposited dust on urban tree leaves depending applied washing method." Landscape & Environment 10, no. 1 (June 7, 2016): 45–52. http://dx.doi.org/10.21120/le/10/1/4.

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In our study, the concentrations of elements were determined in leaves and deposited dust of Quercus robur and Celtis occidentalis which were washed with distilled water, rainwater and tap water. According to our results, each washing solutions had a significant effect on the elemental concentrations in the foliage dust. The highest concentrations of aluminum, chromium, copper, iron, manganese and zinc were detected in the foliage dust which was washed down with rainwater. The highest strontium and barium concentrations were found in the foliage dust which was washed down with tap water. We observed chromium and manganese accumulation in Q. robur leaves, while the concentrations of barium, copper and strontium were the highest in C. occidentalis leaves. Our results demonstrated the effect of rainwater on tree leaves which phenomenon occurs naturally. Rainwater may wash down the dry deposited foliage dust from the leaf surface, but it also delivers a certain concentration of elements through wet deposition.

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45

Blaurock-Busch, E., Albrecht Friedle, Michael Godfrey, Claus E. E. Schulte-Uebbing, and Carin Smit. "Metal Exposure in the Children of Punjab, India." Clinical Medicine Insights: Therapeutics 2 (January 2010): CMT.S5154. http://dx.doi.org/10.4137/cmt.s5154.

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Our test results documented that hair and urine mineral analysis results support each other. This is of interest, because hair analysis evaluates past exposure while urine analysis detects immediate exposure. We evaluated barium, cadmium, manganese, lead and uranium in hair and urine. Our test results indicate that all of the children show evidence of past and immediate exposure to one or more metals. Hair mineral test results for the 114 children aged 12 and younger showed some type of toxic metal exposure for each one of the children; 88% exceeded the uranium reference range for hair. This indicates past and chronic exposure. After renal evaluation, 55 children aged 3–12 years who passed certain criteria were selected for urine baseline testing. Urine baseline concentrations are a direct reflection of immediate exposure. Of the 55 children, 47 showed elevated urine concentrations for one or more of the toxins listed above, demonstrating immediate exposure. DMSA is recommended as an oral antidote for lead and other metals. We selected 55 children aged 3–12 for a DMSA (Dimercapto succinic acid) urine challenge test. Our results showed that 98% of this group showed lead concentrations above the baseline level, demonstrating lead binding and excretion. The DMSA challenge did not affect barium, cadmium, manganese and uranium, suggesting that for these elements, DMSA may not be the chelating agent of choice. In summary, hair and urine mineral testing demonstrated that chronic and immediate toxic exposure had affected our test group of Punjabi children. The DMSA challenge test was effective in detoxifying lead, but did not affect barium, cadmium, manganese or uranium.

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46

Alzaid, Meshal. "Enhancement in Optical Properties of Lanthanum-Doped Manganese Barium Hexaferrites under Different Substitutions." Advances in Condensed Matter Physics 2021 (March 6, 2021): 1–6. http://dx.doi.org/10.1155/2021/8849595.

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The permeability and electrical resistivity of barium hexaferrite magnetic materials can be used in various products such as magnetic recording media, computers, electronic devices, materials for permanent magnets, and communication devices. This work focuses on the synthesis of rare earth lanthanum (La3+)-doped manganese in barium hexaferrite (Ba1−xLaxMnyFe12−yO19) (x = 0.02–0.10 and y = 0.02–0.10) prepared by using the coprecipitation method. The intensity peak is increased with increasing the concentration of lanthanum, which shows the enhancement in the degree of crystallinity and increase in the size of crystallite. The band gap energy decreased gradually with the increase of concentration of lanthanum. The micrographs observed that the material is basically made up of some rings or rods such as particles in pure La-Ma in barium hexaferrite. The agglomeration was observed because of heat behavior at 600°C or may be concentration effect. The structural studies are done using X-ray diffraction, UV, FT-IR, and SEM techniques.

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47

Salina, V. A., S. O. Baisanov, B. K. Kasenov, and V. V. Tolokonnikova. "Manganese-based alloy for modification with barium." Steel in Translation 44, no. 9 (September 2014): 669–75. http://dx.doi.org/10.3103/s0967091214090137.

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48

Antanasijevic, Davor, Natasa Lukic, Viktor Pocajt, Aleksandra Peric-Grujic, and Mirjana Ristic. "Analysis of selected elements in water in the drinking water preparation plants in Belgrade, Serbia." Chemical Industry 65, no. 2 (2011): 187–96. http://dx.doi.org/10.2298/hemind101027001a.

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Belgrade's water supply relies mainly on the River Sava and groundwater supply wells, which are located in the vicinity of the river and Ada Ciganlija. In this paper, the content of aluminum, boron, chromium, manganese, cobalt, nickel, copper, zinc, arsenic, cadmium, barium and lead was analyzed in raw water as well as drinking water distributed by the Water Supply and Sewage of Belgrade. A total of 14 samples were examined from all water treatment plants that are part of the distribution system. The measurements were conducted using the inductively coupled plasma-mass spectrometry (ICP-MS) technique. The aim of this research was to examine the effectiveness of drinking water preparation process in the plants belonging to the Water Supply and Sewage of Belgrade. The content of certain elements varies considerably in raw water (river and groundwater): the concentration of boron in river water is two to three times lower than the concentration in groundwater; the concentration of arsenic in river water is ten to twenty five times lower than the concentration in groundwater; the concentration of aluminum in all groundwater samples was below the detection limit of the instrument (0.50 ?g/dm3), whilst in the river water the content of aluminum was about 50 ?g/dm3 and the concentration of manganese in the river water was up to 10 times lower than the concentrations in groundwater. In all drinking water samples the concentration of the elements were bellow the maximum allowed levels according to the Serbian regulations. Correlation coefficients determined for boron, manganese, cobalt, nickel, copper, zinc, arsenic, barium and lead, which were analyzed in raw waters, show that four groups of elements can be distinguished. Boron, manganese, arsenic and barium are related to each other and probably have a common natural origin; copper and lead probably have a common anthropogenic origin; correlation of nickel and cobalt was observed, while zinc was not in correlation with any other element.

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Altunok, V., E. Yazar, and N. Yuksek. "Selected Blood Serum Elements in Van (Turkey) Cats." Acta Veterinaria Brno 76, no. 2 (2007): 171–77. http://dx.doi.org/10.2754/avb200776020171.

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The Turkish Van cat originates from eastern Turkey. One of the characteristic features of Van cats is the colour of their eyes, which can be both eyes blue, both eyes amber or one eye blue and the other amber. Serum essential trace, macro and industrial element concentrations of Van cats (n = 47) according to sex, age, hair length and eye colour differences were investigated. Serum aluminium, arsenic, boron, barium, cobalt, chromium, copper, gallium, indium, iron, lead, lithium, manganese, nickel, selenium, silver, sulphur, strontium, vanadium and zinc were measured with ICP-OES plasma optical atomic emission spectrometer. In result, serum aluminium, barium, copper, manganese and strontium levels in male cats were found higher (p < 0.05) than in female cats. Serum aluminium, copper, manganese, strontium and zinc amounts of blue-blue eyed cats were found higher (p < 0.05) than amber-amber, amber-blue and blue-amber eyed cats, and serum lithium of blue-amber eyed cats was higher (p < 0.05) than blue-blue eyed cats. There were no statistically significant differences (p &#x003E 0.05) found in the age and hair length groups. Our results indicate that several of the blood serum elements of Van cats may be related to their eye colours and sex differences.

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Firouzabadi, Habib, Babak Karimi, and Mohammad Abbassi. "Efficient Solvent-free Oxidation of Benzylic and Aromatic Allylic Alcohols and Biaryl Acyloins by Manganese Dioxide and Barium Manganate." Journal of Chemical Research, no. 3 (1999): 236–37. http://dx.doi.org/10.1039/a806954i.

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