Log in

Relevant bibliographies by topics / Barium Manganite

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Barium Manganite'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Barium Manganite.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Barium Manganite"

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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).

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Barium Manganite"

1

Chen, Michael H. "Magnetic phase transitions in praseodymium-barium doped manganites." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2007. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Mubumbila, Mpoyi. "Study of doped barium manganites : electrical and magnetic properties." Thesis, University of Aberdeen, 2006. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU224732.

Full text

Abstract:

The electrical and magnetic properties of barium manganite solid solutions Ba_4-xA_xMn₃O₁₀, Ba_6-xA_xMn₅O₁₆, (A = La, Sr and Nd), Ba_4-xSr_xMn_3-yFe_yO₁₀ and Ba₆Mn_5-yFe_yO₁₆ have been investigated. Initially, Ba₄Mn₃O₁₀ and Ba_3.9La_0.1Mn₃O₁₀ were synthesised. XPS¹ measurements suggested that the latter phase was substoichiometric in oxygen. A.C. impedance showed that the La-doped sample displayed insulator-like behaviour, whereas the pure one exhibited a metallic to insulator transition. ND² results showed both samples are antiferromagnetic (with T_N = 170 K for Ba₄Mn₃O₁₀). In addition, a decrease of the ordered Mn magnetic moment was observed in the La-doped sample. SEM³ and a.c. impedance data for Ba_4-xSr_xMn₃O₁₀ revealed that conductivity drops as grain size decreases. It has also been shown that doping with a smaller ion causes a decrease in the Mn magnetic moment and can increase the resistivity of the sample. Doping with a higher valence ion prompts a change in the conduction mechanism leading to semiconductor behaviour above room temperature. A loss of oxygen induces a creation of Mn³⁺ - O – Mn⁴⁺ interactions which may affect the magnetic properties. Comparison between the properties of Ba_3.9La_0.1Mn₃O₁₀ and Ba_3.9Nd_0.1Mn₃O₁₀ was one of the major contributions of this thesis. The former is antiferromagnetic, whilst the latter became ferromagnetic below 100 K. Both compounds exhibit semiconductor behaviour above room temperature. However, Ba_3.9La_0.1Mn₃O₁₀ has lower resistivity than Ba_3.9Nd_0.1Mn₃O₁₀.

APA, Harvard, Vancouver, ISO, and other styles

3

Drennan, Robin Lennox. "Binary and ternary pyrotechnic systems containing manganese, molybdenum, barium peroxide and strontium peroxide." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1006765.

Full text

Abstract:

Barium peroxide was selected as oxidant in a fundamental physico-chemical study of binary pyrotechnic systems on account of its apparently simple decomposition stoichiometry. With this selection, the choice of fuel was governed by the requirements of a self-sustaining reaction at combustion temperatures below the melting point of the platinum/rhodium thermocouples (∼1760°C) used for recording temperature-time profiles during burning, and at burning rates not exceeding the response of the sensors used to monitor combustion. Both manganese and molybdenum metal powders satisfied the above requirements. Strontium peroxide was also available as an oxidant and so the combustion of binary metal/oxidant systems using both fuels and both BaO₂ and SrO₂ oxidants was investigated. The Mn/BaO₂, MoBaO₂ and Mn/SrO₂ systems burnt over a wide range of compositions, but the range of ignitable compositions for the Mo/SrO₂ system was very limited. The linear burning rates, for all these systems, ranged from 2 to 12 mm s⁻¹ and burning rates were increased by the use of smaller particle-sizes of fuel and greater loading pressures. Inert additives generally decreased the burning rate. Temperature-time profiles were recorded for all the compositions which sustained combustion. Kinetic parameters were estimated from the shapes of these profiles using procedures developed by Hill et al and Boddington and Laye. Activation energies derived from the profiles were low (3 to 40 kJ mol⁻¹) and support suggestions that reactions at high temperatures are controlled by diffusion processes. Thermal analysis was used to identify the processes occurring in the four systems. The main exothermic events were observed to correspond approximately with the onset of oxidant decomposition. A pre-ignition reaction was tentatively identified in the Mn/BaO₂ system. Oxidation of the metal fuels was generally incomplete, probably because of the formation of protective layers of product. Activation energies, derived from thermal analysis results, were in the range of from 70 to 720 kJ mol⁻¹. Ternary systems containing either mixed fuels or mixed oxidants were also examined. No interactions hetween the fuels or between the oxidants were observed. Other techniques used included bomb calorimetry, measurement of thermal conductivity, X-ray powder diffraction, infrared spectroscopy and scanning electron microscopy.

APA, Harvard, Vancouver, ISO, and other styles

4

Aidel, Soraya. "Microémulsions inverses et synthèse de catalyseurs hexaaluminate de baryum substitués par du manganèse : activité des catalyseurs dans l'oxydation du méthane." Lyon 1, 2005. http://www.theses.fr/2005LYO10078.

Full text

Abstract:

L'objectif de ce travail est de synthétiser des catalyseurs actifs dans la réaction d'oxydation du méthane à partir d'une nouvelle méthode de synthèse. Les particules sont préparées par voie sol-gel à l'intérieur des gouttelettes d'eau d'une microémulsion inverse. Cette technique permet d'obtenir des nanoparticules de formes et de tailles prédéfinies par celles des gouttelettes qui leur ont donné naissance, et dont la distribution de taille est monodisperse. Deux microémulsions distinctes (l'une à base de NEODOL 91-6 et l'autre, de Triton® X-100) ont été étudiées puis utilisées afin de synthétiser une matrice hexaaluminate de baryum. Les catalyseurs ont été obtenus par substitution d'un ou plusieurs ions aluminium de la matrice, par des ions manganèse. Dans cette synthèse, la microémulsion au NEODOL 91-6 se révèle plus efficace que la seconde, et conduit à des catalyseurs actifs dans la réaction de combustion du méthane. Les caractérisations physico-chimiques montrent un masquage possible des ions manganèse dans les catalyseurs obtenus à partir de la microémulsion au Triton X-100, conduisant ainsi à de faibles propriétés catalytiques.

APA, Harvard, Vancouver, ISO, and other styles

5

Lay, Elisa. "Nouveaux matériaux d'électrode de cellule SOFC." Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00461152.

Full text

Abstract:

Ce travail est consacré à l'étude des influences de deux cations, le cérium et le baryum, sur les propriétés structurales, physico-chimiques, électriques et électrochimiques de l'oxyde (La,Sr)(Cr,Mn)O3 (LSCM). L'effet de l'état d'oxydation du cérium a été déterminé en substituant les sites A de LSCM et d'un oxyde de composition proche, CexSr1-xCr0,5Mn0,5O3 (CeSCM). L'influence des propriétés de basicité du baryum a été examinée. Les matériaux sont stables en conditions de fonctionnement d'anode pour SOFC. La conductivité est de type p pour CeLSCM et CeSCM. Les composés LBCM sont des semi-conducteurs de type n pour des pressions partielles comprises entre 1 et 10-4 atm, et de type p pour des pressions plus faibles. Sous atmosphère neutre, la conductivité électrique totale augmente avec la teneur en cérium dans LSCM, et la conductivité des matériaux CeSCM est similaire à celle de CeLSCM substitué par 25% de cérium (36 S.cm-1 à 900 °C). Sous atmosphère réductrice, la conductivité des matériaux CeLSCM est de l'ordre de 1 S.cm-1. La quantité de baryum n'a pas d'influence sur la conductivité de LSBCM. La caractérisation d'électrodes ponctuelles denses a permis de montrer que les performances anodiques augmentent avec la teneur en cérium substitué au lanthane dans LSCM. La nature des processus impliqués n'est pas modifiée lorsque le strontium est substitué par le cérium, même si l'absence de lanthane pénalise le comportement anodique. Des performances intéressantes pour une application comme matériau d'anode pour SOFC ont été atteintes pour le composé La0,75Ba0,25Cr0,5Mn0,5O3. Les origines des contributions élémentaires des caractéristiques d'électrode sont discutées.

APA, Harvard, Vancouver, ISO, and other styles

6

Terry, David A. "Lithotectonic setting and metallogenic significance of barite-manganese occurrences in the Tetlin district, eastern Alaska Range." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28524.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Pignard, Stéphane. "Elaboration par MOCVD à injection, caractérisations structurale et physique de films d'oxydes magnétiques : hexaferrite BaFe12O19 et pérovskite à magnétorésistance géante La(1-x)MnO(3-delta)." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0189.

Full text

Abstract:

Un des problemes majeurs des procedes cvd reside dans le controle precis de la pression de vapeur des precurseurs, lorsque ceux-ci sont liquides ou solides. Un nouveau procede, brevete dans notre laboratoire, permet de resoudre ce probleme : il s'agit du procede cvd a injection. Son principe est base sur l'injection controlee de micro-quantites d'une solution contenant les precurseurs. Le premier objectif de ce travail a ete la construction et la mise au point d'une nouvelle enceinte d'elaboration de couches minces par voie cvd basee sur ce principe. Dans l'effort d'augmentation de la densite de stockage sur milieu magnetique, l'enregistrement perpendiculaire suscite depuis de nombreuses annees un interet de tout premier plan. L'hexaferrite de baryum bafe#1#2o#1#9 presente des caracteristiques interessantes pour cette application : les films doivent etre textures et convenablement dopes pour reduire le champ d'anisotropie. Jusqu'alors seules des techniques physiques de depot ont ete utilisees pour la synthese de telles couches. Nous avons etudie la possibilite d'elaborer des films de bafe#1#2o#1#9 par voie chimique au moyen du procede cvd a injection. Concernant la lecture des informations stockees, l'accroissement de la densite de stockage necessite l'utilisation de nouvelles tetes de lecture : dans ce domaine, les tetes magnetoresistives sont les plus prometteuses. Les recherches se sont recemment intensifiees avec la decouverte de la magnetoresistance colossale des composes la#1#-#xa#xmno#3#-# (a=sr,ca,ba). Nous nous sommes interesses aux manganites de lanthane lacunaires la#1#-#xmno#3#-#, deposes sous forme de couches minces par cvd a injection, dont les proprietes ont ete peu etudiees jusqu'a ce jour. Nous montrons que la technique de depot mise au point peut etre tres performante pour l'elaboration de tels films. Les proprietes structurales et physiques des couches la#1#-#xmno#3#-# sont etudiees : une magnetoresistance de 20%/tesla est obtenue a temperature ambiante

APA, Harvard, Vancouver, ISO, and other styles

8

GALANTE, ANA M. S. "Pesquisa, desenvolvimento e caracterizacao de materiais dosimetricos para monitoramento em processos de irradiacao com doses altas." reponame:Repositório Institucional do IPEN, 2003. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11139.

Full text

Abstract:

Made available in DSpace on 2014-10-09T12:48:47Z (GMT). No. of bitstreams: 0
Made available in DSpace on 2014-10-09T13:57:54Z (GMT). No. of bitstreams: 1 09602.pdf: 7986999 bytes, checksum: 3925b141ff3cb5747e1bfa4d230c6dbf (MD5)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:99/06641-9

APA, Harvard, Vancouver, ISO, and other styles

9

Silva, Graciela Aparecida dos Santos. "ALTERAÇÕES COLORIMÉTRICAS EM COMPOSTO DE BaO-Al2O3-MnO2 A PARTIR DA SÍNTESE POR NANOESCALA." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2013. http://tede2.uepg.br/jspui/handle/prefix/1432.

Full text

Abstract:

Made available in DSpace on 2017-07-21T20:42:41Z (GMT). No. of bitstreams: 1 Graciela Aparecida Santos Silva.pdf: 4725206 bytes, checksum: 1b5275fc3c55802f9ed0465ffbc48d75 (MD5) Previous issue date: 2013-02-22
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The purpose of this work was the synthesis of nanoscaled BaO-Al2O3-MnO2 system and its characterization. The nanoparticulate system was prepared by mixing salts of Ba, Al and Mn in a chamber of low temperature, lyophilizing the solutions of their salts, and followed by calcination in the temperature range from 230 °C to 1190° C.This synthesis was compared with two other systems, prepared using a chemical mixture of oxides, with a particle size of conventional size and also with the phase of nanoscale oxides, followed by calcination in the same temperature conditions. The colorimetric properties of ceramic powders were evaluated by UV-visible spectroscopy and coordinates CIE-L a b and characterized by X-ray diffraction, Xray fluorescence, simultaneous thermal analyisis, scanning electron microscopy and laser scattering technique. This nanoscaled synthesis provides a possible application in the production on ceramic pigments because the resulting powder showed different color in comparison to the other systems. The nanoparticulate system showed the advantage of needing lower calcination temperatures, and, at 1135ºC,showed a different color that was not presented by powders synthetized by other methods.
A proposta deste trabalho consiste na síntese em nanoescala do sistema BaO-Al2O3-MnO2, bem como sua caracterização. O sistema nanoparticulado foi preparado misturando sais de Ba, Al e Mn em câmara de baixa temperatura, liofilizando-se assim as soluções dos respectivos sais, seguidos de calcinação na faixa de temperatura de 230 °C a 1190 °C. Comparou-se esta síntese com duas metodologias, preparadas através de uma mistura química de óxidos, com tamanho de partícula convencional e também com tamanho de fase dos óxidos em nanoescala, seguidas de calcinação nas mesmas condições de temperatura. Os pós cerâmicos foram avaliadas por espectroscopia no UV-visível e coordenadas CIE-L a b e caracterizado por difração raios X, fluorescência de raios X, termogravimetria e análise termodiferencial simultânea, microscopia eletrônica de varredura e espectroscopia de fotocorrelação. Essa síntese por nanoescala traz a possível aplicação na produção de pigmentos cerâmicos, pois trouxe alterações colorimétricas diferentes comparando com os outros sistemas. Esse método teve vantagem, pois trouxe temperaturas de calcinação mais baixa, e em 1135 ºC, o sistema nanoparticulado apresentou uma coloração que não foi observado para os outros métodos de síntese.

APA, Harvard, Vancouver, ISO, and other styles

10

Brunner, David R. "The Composition and Distribution of Coal-Ash Deposits Under Reducing and Oxidizing Conditions From a Suite of Eight Coals." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2642.

Full text

Abstract:

Eighteen elements, including: carbon, oxygen, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, potassium, calcium, titanium, chromium, manganese, iron, nickel, strontium, and barium were measured using a scanning electron microscope with energy dispersive spectroscopy from deposits. The deposits were collected by burning eight different coals in a 160 kWth, staged, down-fired, swirl-stabilized combustor. Both up-stream and down-stream deposits from an oxidizing region (equivalence ratio 0.86) and reducing region (equivalence ratio 1.15) were collected. Within the deposits, the particle size and morphology were studied. The average particle cross-sectional area from the up-stream deposits ranged from 10 - 75 µm2 and had a standard deviation of 36 - 340 µm2. These up-stream particles were of various shapes: spherical, previously molten particles; irregular particle that had not melted, hollowed spherical shells; and layered or strands of particles. These particles were a mixture of burned and unburned coal being deposited at various stages of burnout and having completed some burnout after deposition. The average particle cross-sectional area from the down-stream deposits ranged 0.9 - 7 µm2 and the standard deviation range of 2.6 - 30 µm2. The shape of the particles on the bottom sleeves are typically spherical indicating melting prior to deposition. Particles contained a distribution of elemental compositions that were not tightly grouped on ternary phase diagrams. This indicated that particles were not single compounds or phases but each particle contained a mixture of multiple compounds. Coals' deposit sulfur was strongly correlated with the calcium and iron content of the ASTM ash analysis. The low rank sub-bituminous and lignite coals that had high calcium content produced high sulfur deposits, particularly in the oxidizing region, down-stream deposits. The high iron bituminous coals, also produced high sulfur deposits, but more so in the reducing region, up-stream deposits. The low calcium and low iron coals produced low sulfur deposits. Mahoning was an exception being high in iron content but remaining low in sulfur content in the deposit. Gatling coal showed numerous deposit particles that contained only iron and sulfur consistent with the high pyrite content of Gatling coal. The average concentration of chlorine was insignificant in all of the deposits with the concentration being less than 100 ppm. Individual particles containing chlorine were found and were associated with potassium, sodium, and iron.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Barium Manganite"

1

Toxicity Assessments of Antimony, Barium, Beryllium, and Manganese for Development of Ecological Soil Screening Levels (ECO-SSL) Using Folsomia Reproduction Benchmark Values. Storming Media, 2002.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Toxicity Assessments of Antimony, Barium, Beryllium, and Manganese for Development of Ecological Soil Screening Levels (ECO-SSL) Using Enchytraeid Reproduction Benchmark Values. Storming Media, 2002.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Toxicity Assessments of Antimony, Barium, Beryllium, and Manganese for Development of Ecological Soil Screening Levels (ECO-SSL) Using Earthworm (Eisenia Fetida) Benchmark Values. Storming Media, 2002.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Barium Manganite"

1

Pardasani, R. T., and P. Pardasani. "Magnetic properties of barium-manganese pyrophosphate." In Magnetic Properties of Paramagnetic Compounds, 333–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45972-0_250.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Santos, Diogo M. F., and César A. C. Sequeira. "Electrocatalytic Studies of Oxygen Reduction by Lanthanum Barium Manganate." In Defect and Diffusion Forum, 327–32. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-36-1.327.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Kubuki, Shiro, Hitomi Masuda, Kazuhiko Akiyama, Isao Furumoto, and Tetsuaki Nishida. "Electrical conductivity and local structure of barium manganese iron vanadate glass." In ICAME 2011, 497–501. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-4762-3_86.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Yanagisawa, A. "Barium Manganate from Potassium Permanganate or Potassium Manganate and Barium Chloride." In Compounds of Groups 13 and 2 (Al, Ga, In, Tl, Be...Ba), 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-007-00716.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Tsuboi, S. "Oxidation Using Alumina and Barium or Potassium Manganate." In Compounds of Groups 13 and 2 (Al, Ga, In, Tl, Be...Ba), 1. Georg Thieme Verlag KG, 2004. http://dx.doi.org/10.1055/sos-sd-007-00206.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

E. Guareschi, Edda. "The toxicity of microplastics." In Trace Metals in the Environment [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1002272.

Full text

Abstract:

According to more than 200 scholarly publications, plastic pollution has been emerging as a major environmental concern in recent decades, and has been posing a relevant threat to ecosystems and global health. While the focus has primarily been on the physical, chemical and biological impacts of primary and secondary plastics, also for their ability to cross biological barriers within the human body, an additional hazard is represented by their association to heavy metals, used as additives. Metals are, in fact, added to plastics for their stabilizing actions. The examples of metal toxicity here reported are Antimony (Sb), Arsenic (As), Barium (Ba), Beryllium (Be), Cadmium (Cd), Chromium (Cr), Cobalt (Co), Copper (Cu), Iron (Fe), Lead (Pb), Manganese (Mn), Nickel (Ni), Selenium (Se), Vanadium (V) and Zinc (Zn). This chapter explores the toxicity of metals associated with plastic pollution in the environment, illustrating their potential consequences for the global ecological system, with prevalent focus on human health. The interdisciplinary approach, which includes environmental science, chemistry and toxicology, aims to enhance the understanding of this complex issue and highlight the urgent need for efficient mitigation strategies.

APA, Harvard, Vancouver, ISO, and other styles

7

Chun, C. O. J., and M. L. Delaney. "Phosphorus, barium, manganese, and uranium concentrations and geochemistry, Nazca Ridge Site 1237 sediments." In Proceedings of the Ocean Drilling Program, 202 Scientific Results. Ocean Drilling Program, 2006. http://dx.doi.org/10.2973/odp.proc.sr.202.205.2006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

KILIAS, STEPHANOS P. "Microbial Mat–Related Structures in the Quaternary Cape Vani Manganese-Oxide (-Barite) Deposit, NW Milos Island, Greece." In Microbial Mats in Silicilastic Depositional Systems Through Time, 97–110. SEPM (Society for Sedimentary Geology), 2012. http://dx.doi.org/10.2110/sepmsp.101.097.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Barium Manganite"

1

Varshney, Dinesh, Irfan Mansuri, M. W. Shaikh, and A. Yogi. "Structure and electrical resistivity behavior of barium doped LaMnO3 manganite." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710402.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Hercuadi, Asep Yudi, Nasrullah Armi, Nanang Sudrajat, and Wisnu Ari Adi. "Calculation of complex permeability and permittivity on Lanthanum barium manganite materials at X-band frequency." In 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2015. http://dx.doi.org/10.1109/apcap.2015.7374462.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

I.M. El Barrasi, Ismaeel Musa, Arthur Hale, Ahmed Mohamed Ali, Mamdouh Atef El Mohandes, and Ibrahim Mohamed Ali. "High Specific Gravity, Ultrafine Particle Size and Acid Soluble Manganese Tetra Oxide Succeeds in Replacing Heavy Brines as Completion and Workover Fluid." In International Petroleum Technology Conference. IPTC, 2023. http://dx.doi.org/10.2523/iptc-22888-ea.

Full text

Abstract:

Abstract Objectives/Scope A high-density completion and workover fluid (18-20 ppg) was required for deep high-pressure gas wells. The traditional clear completion brines, which provide a solids-free environment to run and set downhole completion equipment were evaluated and were not approved as they came with an expensive price tag and, more importantly, they came with serious health, safety, and environmental concerns in addition to formation damage concerns. The available alternative barite weighed water-based mud (WBM) was used as completion fluid to set lower completion; however, due to the concentration and size of the solids contained in this system, serious issues became evident. These included leaks due to poor sealing, string plugging, and stuck completions due to barite settlement issues. Manganese tetroxide (Mn3O4) was evaluated as an alternative to barite as it has higher specific gravity and a much smaller particle size. Methods, Procedures, Process To overcome all limitations of brines and barite WBM, and achieve the required density for well control purposes, to address this issue, rigorous lab work was performed to formulate a completion and workover fluid with viscous sodium chloride brine. Additional density was achieved with manganese tetroxide (Mn3O4). Results, Observations, Conclusions Manganese tetroxide has a very low SAG index due to its ultrafine particle size. The small size of manganese tetroxide (Mn3O4) eliminated the solids sag and settlement issues that were associated with barite weighed fluid and allowed for longer static fluid periods without the need to interrupt operations to circulate and condition the fluid saving significant time lost on sorting out all barite sagging related issues in previous completion and workover operations. Novel/Additive Information This paper presents laboratory design data and comparative data where this type of high-density fluid is used to successfully run lower completions and perform successful workover operations in gas wells without any problems.

APA, Harvard, Vancouver, ISO, and other styles

4

Susilawati, Aris Doyan, and Khalilurrahman. "Synthesis and characterization of barium hexaferrite with manganese (Mn) doping material as anti-radar." In THE 6TH INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED PHYSICS (THE 6th ICTAP). Author(s), 2017. http://dx.doi.org/10.1063/1.4973096.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Ardani, Adinda, Sitti Ahmiatri Saptari, and Arif Tjahjono. "Analysis the increased of nickel substitution on crystal structure and magnetic properties of lanthanum barium manganate material." In PROCEEDINGS OF THE 4TH INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2020): Accelerating Research and Innovation on Metallurgy and Materials for Inclusive and Sustainable Industry. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0060291.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Leonova, L. V., A. I. Antoshkina, and Yu S. Simakova. "Specific minerals in bryozoan bioherms and polychaetian limestones (Kazanthip reserve, Crimea)." In All-Russia Lithological Meeting «Geology of reefs». Institute of Geology FRC Komi SC UB RAS, 2020. http://dx.doi.org/10.19110/98491-013-71-73.

Full text

Abstract:

The object of our research is the Kazantip Cape (Kerch Peninsula, Crimea). Its attraction is a ring-shaped rock massif composed of bryozoans previously considered to be a reef structure growing on the limbs of rising brachyanticline about 8 million years ago. Application of complex of investigating methods show that clay deposits underlying bryozoan structure are composed of expandable mixed-layered minerals, smectite, kaolinite, chlorite, illite with accessory minerals (zircon, monazite, ilmenite). These clays are the result of eruption of fossilized analogue of mud volcano. This process was accompanied by unloading of cold gas-fluid seepage. Specific mineralization (barite, celestine, strontianite, authigenic minerals of rare-earth elements and manganese) of bryozoan’s bioherms indicates that the seep process continued even after the waning of mud volcanism.

APA, Harvard, Vancouver, ISO, and other styles

7

Alotaibi, Nouf, Awoye Lawson-Jack, Kern Smith, Salako Olaoluwa, and Gonzalo Chinea. "Damage Mechanism of High-Density Mn3O4/ BaSO4 Based Workover Fluids in Carbonate Reservoirs." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22033-ea.

Full text

Abstract:

Abstract The objective of this paper is to evaluate the formation damage mechanisms on carbonate porous media due to the effect of solids (high-density Mn3O4 and BaSO4 weighting materials) and other particles dispersed in workover fluids. Barite (BaSO4) and Manganese Tetroxide (Mn3O4) are both highly dense compounds (4.5 – 4.8 g/cm3) with particle size of approximately 50 and 5 microns (μm) respectively, which can significantly impact permeability due to solids invasion. A formation damage lab simulator was utilized to take selected core samples up to reservoir conditions. Initially, XRD/XRF and a baseline CT scan of the reservoir core plugs were conducted prior to core flooding. Differential pressures along core samples were measured at controlled flowrates during nitrogen gas flooding carried out before and after the workover fluid application and also, after removal of the filter cake formed by the workover fluid. Darcy's equation was used to calculate permeability values, and core plug CT scans post-floods were used to assist with the interpretation of the associated formation damage mechanism. This study shows that the presence of solids inside the porous media physically plugging fluid pathways and a thick external filter cake due to high fluid filtration are the main mechanisms that contributed to the reduced return permeability observed on the core plug samples. The internal filter cake associated with the penetration of filtrate and solid particles into the pores had a greater effect on the observed permeability reduction compared to that of the external filter cake. The characteristics of the filter cake is strongly controlled by the mud particle type, size, and concentration. The combination of Manganese Tetroxide (Mn3O4) based workover fluid filter cake and the carbonate rock sample's face had low permeability causing a larger pressure drop and a lower productivity compared to the Barite (BaSO4) based filter cake in interaction with the same rock type. The permeability of the filter cake was lowered with decreased filtration.

APA, Harvard, Vancouver, ISO, and other styles

8

Al-Naimi, Noora, Hamood Al-Saadi, Ahmed Abou Elezz, Maryam Al-Adba, and Hassan Hassan. "Preliminary Investigation of Heavy Metals in Deposited Dust on Roadside Sidr Leaves." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0032.

Full text

Abstract:

Urban pollution has different forms; one of them is air pollution by natural sources such as dust storms or by anthropogenic sources such as traffic, whereas both are considered among the most risky environmental problems especially when it reaches soil surface and is transported to plants and enters food chain. The current study aims to evaluate the heavy metals in dust, deposited on the leaves of the Sidr trees by roadsides as a first step in assessing the use of this plant as a bio-monitor of environmental pollution. The Sidr tree was chosen to evaluate the impact of pollution because it is very common in the region and among evergreen trees in the streets, gardens and residential areas of Doha. The study was carried out close to Qatar University campus in Doha city (traffic intersections and near construction activities) as well as from a farm (located far away from traffic) as a control sample. The concentrations of ten traffic-related metals namely iron (Fe), cadmium (Cd), lead (Pb), copper (Cu), nickel (Ni), zinc (Zn), manganese (Mn), aluminum (Al), barium (Ba), and mercury (Hg) were determined in the deposited dust on leaves using ICP-OES. In our preliminary findings, we found that the distribution of trace metals in leaf dust samples from our study is similar to those reported in an earlier study done in southwestern Iran.

APA, Harvard, Vancouver, ISO, and other styles

9

Wagle, Vikrant, Abdullah Yami, Michael Onoriode, Jacques Butcher, and Nivika Gupta. "Low ECD High Performance Invert Emulsion Drilling Fluids: Lab Development and Field Deployment." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/202115-ms.

Full text

Abstract:

Abstract The present paper describes the results of the formulation of an acid-soluble low ECD organoclay-free invert emulsion drilling fluid formulated with acid soluble manganese tetroxide and a specially designed bridging package. The paper also presents a short summary of field applications to date. The novel, non-damaging fluid has superior rheology resulting in lower ECD, excellent suspension properties for effective hole cleaning and barite-sag resistance while also reducing the risk of stuck pipe in high over balance applications. 95pcf high performance invert emulsion fluid (HPIEF) was formulated using an engineered bridging package comprising of acid-soluble bridging agents and an acid-soluble weighting agent viz. manganese tetroxide. The paper describes the filtration and rheological properties of the HPIEF after hot rolling at 300oF. Different tests such as contamination testing, sag-factor analysis, high temperature-high pressure rheology measurements and filter-cake breaking studies at 300oF were performed on the HPIEF. The 95pcf fluid was also subjected to particle plugging experiments to determine the invasion characteristics and the non-damaging nature of the fluids. The 95pcf HPIEF exhibited optimal filtration properties at high overbalance conditions. The low PV values and rheological profile support low ECDs while drilling. The static aging tests performed on the 95pcf HPIEF resulted in a sag factor of less than 0.53, qualifying the inherent stability for expected downhole conditions. The HPIEF demonstrated resilience to contamination testing with negligible change in properties. Filter-cake breaking experiments performed using a specially designed breaker fluid system gave high filter-cake breaking efficiency. Return permeability studies were performed with the HPIEF against synthetic core material, results of which confirmed the non-damaging design of the fluid. The paper thus demonstrates the superior performance of the HPIEF in achieving the desired lab and field performance.

APA, Harvard, Vancouver, ISO, and other styles

10

Wagle, Vikrant, Abdullah S. Al-Yami, Ziad AlAbdullatif, Abdulaziz S. Bubshait, and Ali AlSafran. "Mitigation of Stuck Pipe Challenges in HTHP conditions Using Acid Soluble Blend of Barite and Manganese Tetroxide as Weighting Materials for Drilling Fluids." In SPE North Africa Technical Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/175844-ms.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Barium Manganite"

1

Phillips, Carlton T., Ronald T. Checkal, Roman G. Kuperman, Michael Simini, and Jason A. Speicher. Toxicity Assessments of Antimony, Barium, Beryllium, and Manganese for Development of Ecological Soil Screening Levels (ECO-SSL) Using Folsomia Reproduction Benchmark Values. Fort Belvoir, VA: Defense Technical Information Center, November 2002. http://dx.doi.org/10.21236/ada422185.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Maps showing anomalous concentrations of zinc, silver, antimony, manganese, barium and strontium in stream sediment and heavy-mineral concentrate from parts of the Ajo and Lukeville 1 degree by 2 degrees quadrangles, Arizona. US Geological Survey, 1988. http://dx.doi.org/10.3133/mf1834e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!