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Journal articles on the topic 'Sesquioxides'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Uzoho, Bethel, Nnaemeka Okoli, and Ugochi Ekwugha. "Impact of Texture on Sesquioxide Distribution in Southeastern Nigerian Soils." International Journal of Environment 8, no. 1 (March 16, 2019): 43–58. http://dx.doi.org/10.3126/ije.v8i1.23148.

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Sesquioxides which play significant roles in soil classification and dominant soil properties vary in soils with particle size fractions. Using randomized complete block design, this study was conducted in the month of June 2018 to evaluate the impact of texture on sesquioxide distribution in humid rainforest soils of Southeastern Nigeria. Four mini-pedons were dug at four landscape positions (upslope, midslope, downslope and flat surface) and triplicate soil samples taken from 0-20, 20-40 and 40-60 cm depths, summing to total of 36 samples. Crystalline and amorphous Al, Fe, Mn and Si oxides were then determined at a depth of 0-20 cm using Dithionate Citrate Bicarbonate (DCB) and ammonium oxalate reagents. Dithionate and oxalate fractions in bulk soil ranged between 9300-11,400 (Fed), 390-1580 (Feox), 4600-6700 (Ald), 660-890 (Alox), 3300-5600 (Mnd), 350-580 (Mnox) and 9600-13,500 (Sid) and 1690-1790 mg kg-1 (Siox), with dithionate superior indicating high crystallinity and low mobility of the sesquioxides. Ratios of bulk soil oxalate/dithionate fractions were low and ranged between 0.04-0.17 (Feox/Fed), 0.11-0.15 (Alox/Ald), 0.10-0.16(Mnox/Mnd) and 0.13-0.18 (Siox/Sid) and confirming their crystallinity. Low Feox/Fed ratios signified that soils were well drained (< 0.35), old (< 0.65) and highly weathered (< 0.50) with the order being a decreasing sequence of upslope > flat surface > down slope > midslope. Sesquioxide contents and reactivity in soil particle size fractions (sand, silt and clay) varied with landscapes. Regression models indicated that particle size fractions accounted for 50% of 2/3rd of the bulk soil sesquioxide concentrations and that averaged over landscapes, sand fraction was more enriched with various sesquioxides than the other soil particle size fractions. Correlations between most bulk soil sesquioxide fractions and sesquioxide fractions with selected soil properties (sand, silt, clay, moisture content, total porosity, organic matter, pH, Ca and ECEC) were significant (P < 0.05).

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2

Rentería, M., A. G. Bibiloni, F. G. Requejo, A. F. Pasquevich, J. Shitu, L. A. Errico, and K. Freitag. "Impurity Cationic-Site Population and Electric-Field Gradient Dependence on Ionic Size in Bixbyites Sesquioxides Implanted With 181Hf → 181Ta." Modern Physics Letters B 12, no. 20 (August 30, 1998): 819–27. http://dx.doi.org/10.1142/s0217984998000949.

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The Perturbed-Angular-Correlation technique was used to study the impurity cationic-site population and electric-field gradients in scandium and samarium sesquioxides implanted with 181 Hf → 181 Ta . We found a departure of the tantalum (hafnium) relative occupancy of the crystallographic sites C and D in the bixbyite structure from the natural abundance of the sites, in the case of scandium sesquioxide, that could be explained in terms of the small lattice parameter of this sesquioxide. A similar behavior occurs in the case of indium sesquioxide. In the rest of the bixbyites measured with 181 Ta , f D /f C remains nearly constant and close to the crystallographic abundance, which is only reached in the case of Sm 2 O 3, the sesquioxide with the largest lattice parameter. Additionally, we confirm a jump in the values of νQ( Ta ) for sites C and D that takes place for a ≤ 1:012 nm, that is for lattice parameters smaller than that of ytterbium sesquioxide.

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3

Petermann, K., G. Huber, L. Fornasiero, S. Kuch, E. Mix, V. Peters, and S. A. Basun. "Rare-earth-doped sesquioxides." Journal of Luminescence 87-89 (May 2000): 973–75. http://dx.doi.org/10.1016/s0022-2313(99)00497-4.

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4

Zhang, Chun Li, Tai Hua Li, Shuang Huan Niu, Rong Fu Wang, Zhan Li Fu, Feng Qin Guo, and Ming Yang. "Synthesis and Evaluation of Novel Organogermanium Sesquioxides As Antitumor Agents." Bioinorganic Chemistry and Applications 2009 (2009): 1–8. http://dx.doi.org/10.1155/2009/908625.

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Five new organogermanium sesquioxides have been synthesized and characterized by elemental analysis and IR spectra. All the compounds were tested for antitumor activities against KB, HCT, and Bel cells in vitro. Compound 5 (-thiocarbamido propyl germanium sesquioxide) showed excellent antitumor activity, and its inhibition yield to KB, HCT, and Bel cells was 92.9%, 84.9%, and 70.9%, respectively. A rapid method was described for the labeling compound 5 with , and the optimum labeling conditions were investigated. The labeling yield is above 90% in pH 7.0, , reaction time greater than 10 minutes, 1 mg of compound 5, and 0.0750.1 mg of . The biodistribution of labeled compound 5 in nude mice bearing human colonic xenografts was studied. The result showed that the tumor uptakes were 0.73, 0.97, 0.87, and 0.62 ID%/g at 1-hour, 3-hour, 6-hour, and 20-hour postinjection, respectively. T/NT (the uptake ratio for per gram of tumor over normal tissues) was 18.3 for tumor versus brain and 5.81 for tumor versus muscle at 20-hour postinjection. The tumor clearance was slow. The results showed that compound 5 may be developed to be a suitable cancer therapeutic agent.

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5

ZINKEVICH, M. "Thermodynamics of rare earth sesquioxides." Progress in Materials Science 52, no. 4 (May 2007): 597–647. http://dx.doi.org/10.1016/j.pmatsci.2006.09.002.

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6

Bernal, S., F. J. Botana, J. J. Calvino, G. Cifredo, R. García, S. Molina, and J. M. Rodríguez-Izquierdo. "HREM characterization of lanthana-supported rhodium catalysts." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 246–47. http://dx.doi.org/10.1017/s0424820100174369.

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Metals supported on rare earth sesquioxides present a non- conventional behavior. Ordinary H2 and-or CO chemisorption techniques cannot be straightforwardly used to characterize this group of catalysts. The assessement to the data of metallic dispersions and the establishment of the occurrence and extent of metal-support interaction phenomena are determinant in order to interpret the properties of these catalysts in hydrogenation reactions. In this work HREM is proposed as a powerfull technique for the study of lanthana supported rhodium catalysts. Such catalysts would be considered as representative of a series of metals supported on rare earth sesquioxides.

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7

Manjón, Francisco, Juan Sans, Jordi Ibáñez, and André Pereira. "Pressure-Induced Phase Transitions in Sesquioxides." Crystals 9, no. 12 (November 28, 2019): 630. http://dx.doi.org/10.3390/cryst9120630.

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Pressure is an important thermodynamic parameter, allowing the increase of matter density by reducing interatomic distances that result in a change of interatomic interactions. In this context, the long range in which pressure can be changed (over six orders of magnitude with respect to room pressure) may induce structural changes at a much larger extent than those found by changing temperature or chemical composition. In this article, we review the pressure-induced phase transitions of most sesquioxides, i.e., A2O3 compounds. Sesquioxides constitute a big subfamily of ABO3 compounds, due to their large diversity of chemical compositions. They are very important for Earth and Materials Sciences, thanks to their presence in our planet’s crust and mantle, and their wide variety of technological applications. Recent discoveries, hot spots, controversial questions, and future directions of research are highlighted.

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8

Lupei, A., and V. Lupei. "RE3+ pairs in garnets and sesquioxides." Optical Materials 24, no. 1-2 (October 2003): 181–89. http://dx.doi.org/10.1016/s0925-3467(03)00123-x.

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9

Granier, Bernard, and Serge Heurtault. "Density of Liquid Rare-Earth Sesquioxides." Journal of the American Ceramic Society 71, no. 11 (November 1988): C466—C468. http://dx.doi.org/10.1111/j.1151-2916.1988.tb07551.x.

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10

Malet, P., M. J. Capitan, M. A. Centeno, J. A. Odriozola, and I. Carrizosa. "EXAFS data analysis for lanthanide sesquioxides." Journal of the Chemical Society, Faraday Transactions 90, no. 18 (1994): 2783. http://dx.doi.org/10.1039/ft9949002783.

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11

Delugas, Pietro, Vincenzo Fiorentini, and Alessio Filippetti. "Dielectric constant boost in amorphous sesquioxides." Applied Physics Letters 92, no. 17 (April 28, 2008): 172903. http://dx.doi.org/10.1063/1.2917797.

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12

Chroneos, A., M. R. Levy, C. R. Stanek, K. McClellan, and R. W. Grimes. "Intrinsic defect processes in bixbyite sesquioxides." physica status solidi (c) 4, no. 3 (March 2007): 1213–16. http://dx.doi.org/10.1002/pssc.200673829.

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13

Ushakov, Sergey V., Shmuel Hayun, Weiping Gong, and Alexandra Navrotsky. "Thermal Analysis of High Entropy Rare Earth Oxides." Materials 13, no. 14 (July 14, 2020): 3141. http://dx.doi.org/10.3390/ma13143141.

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Phase transformations in multicomponent rare earth sesquioxides were studied by splat quenching from the melt, high temperature differential thermal analysis and synchrotron X-ray diffraction on laser-heated samples. Three compositions were prepared by the solution combustion method: (La,Sm,Dy,Er,RE)2O3, where all oxides are in equimolar ratios and RE is Nd or Gd or Y. After annealing at 800 °C, all powders contained mainly a phase of C-type bixbyite structure. After laser melting, all samples were quenched in a single-phase monoclinic B-type structure. Thermal analysis indicated three reversible phase transitions in the range 1900–2400 °C, assigned as transformations into A, H, and X rare earth sesquioxides structure types. Unit cell volumes and volume changes on C-B, B-A, and H-X transformations were measured by X-ray diffraction and consistent with the trend in pure rare earth sesquioxides. The formation of single-phase solid solutions was predicted by Calphad calculations. The melting point was determined for the (La,Sm,Dy,Er,Nd)2O3 sample as 2456 ± 12 °C, which is higher than for any of constituent oxides. An increase in melting temperature is probably related to nonideal mixing in the solid and/or the melt and prompts future investigation of the liquidus surface in Sm2O3-Dy2O3, Sm2O3-Er2O3, and Dy2O3-Er2O3 systems.

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14

Concas, Giorgio, Giorgio Spano, Marco Bettinelli, and Adolfo Speghini. "Distribution of Eu3+ Dopant Ions in C3i and C2 Sites of the Nanocrystalline Sc2O3:Eu Phosphor." Zeitschrift für Naturforschung A 63, no. 3-4 (April 1, 2008): 210–16. http://dx.doi.org/10.1515/zna-2008-3-416.

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The actual occupancy of the two available cation sites by luminescent Eu3+ ions, in the cubic bixbyite-type structure of nanocrystalline sesquioxides, has been investigated by 151Eu Mössbauer spectroscopy and magnetic susceptibility measurements. It was found that one fourth of the europium ions is in the more symmetric site C3i and three fourths in the less symmetric site C2; the distribution is random. In the series of the Eu-doped sesquioxides Sc2O3, Lu2O3, Y2O3 and Eu2O3, the covalency of the Eu-O bond and the Eu site distortion increase with the difference in ionic radii between europium and the cation of the host compound. The magnetic susceptibility has been analyzed as sum of the contributions of the free Eu3+ ion, of the crystal-field effect and of the exchange interaction between europium ions.

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15

Tsirelson, V. G., V. A. Streltsov, R. P. Ozerov, and K. Yvon. "Electron density distribution in 3d-metal sesquioxides." Physica Status Solidi (a) 115, no. 2 (October 16, 1989): 515–21. http://dx.doi.org/10.1002/pssa.2211150219.

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16

Urban, Marek W., and Bahne C. Cornilsen. "Bonding anomalies in the rare earth sesquioxides." Journal of Physics and Chemistry of Solids 48, no. 5 (January 1987): 475–79. http://dx.doi.org/10.1016/0022-3697(87)90108-9.

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17

Altman, Alison B., Joseph I. Pacold, Jian Wang, Wayne W. Lukens, and Stefan G. Minasian. "Evidence for 5d-σ and 5d-π covalency in lanthanide sesquioxides from oxygen K-edge X-ray absorption spectroscopy." Dalton Transactions 45, no. 24 (2016): 9948–61. http://dx.doi.org/10.1039/c6dt00358c.

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The electronic structure in the complete series of stable lanthanide sesquioxides, Ln₂O₃ (Ln = La to Lu, except radioactive Pm), has been evaluated using oxygen K-edge X-ray absorption spectroscopy with a scanning transmission X-ray microscope (STXM).

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18

Pan, M. "Observation of in situ reduction of ceria-supported rhodium catalysts by electron beam irradiation." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 1022–23. http://dx.doi.org/10.1017/s0424820100089421.

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In rhodium catalysts supported on lanthanide oxides, significant difference in rhodium dispersions has been observed between cerium dioxide (CeO2) and sesquioxides (Ln2O3) by high resolution electron microscopy (HREM). This has been attributed to the different behaviors of the oxide supports during their impregnation with aqueous solution of rhodium nitrate (Rh(NO3)3). In the acid media, cerium dioxide has a higher reducibility while the sesquioxides have a higher solubility. So studying the catalyst precursor and the reduction process can provide an understanding of its interaction with the support during the impregnation stage and the metal dispersion on the oxide supports. Results on cerium dioxide support are presented here.The catalyst precursor was prepared by incipient wetness impregnation method as reported elsewhere. The rhodium loading was 2.4 wt%. The HREM work was performed in JEOL 4000EX electron microscope (point resolution of 1.7 Å). The typical current density used during observation was ∼6.5A/cm2 at the specimen. The vacuum in the column of the microscope was ∼10-7 torr.

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19

Fellner, Madeleine, Alberto Soppelsa, and Alessandro Lauria. "Heat-Induced Transformation of Luminescent, Size Tuneable, Anisotropic Eu:Lu(OH)2Cl Microparticles to Micro-Structurally Controlled Eu:Lu2O3 Microplatelets." Crystals 11, no. 8 (August 20, 2021): 992. http://dx.doi.org/10.3390/cryst11080992.

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Synthetic procedures to obtain size and shape-controlled microparticles hold great promise to achieve structural control on the microscale of macroscopic ceramic- or composite-materials. Lutetium oxide is a material relevant for scintillation due to its high density and the possibility to dope with rare earth emitter ions. However, rare earth sesquioxides are challenging to synthesise using bottom-up methods. Therefore, calcination represents an interesting approach to transform lutetium-based particles to corresponding sesquioxides. Here, the controlled solvothermal synthesis of size-tuneable europium doped Lu(OH)2Cl microplatelets and their heat-induced transformation to Eu:Lu2O3 above 800 °C are described. The particles obtained in microwave solvothermal conditions, and their thermal evolution were studied using powder X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), optical microscopy, thermogravimetric analysis (TGA), luminescence spectroscopy (PL/PLE) and infrared spectroscopy (ATR-IR). The successful transformation of Eu:Lu(OH)2Cl particles into polycrystalline Eu:Lu2O3 microparticles is reported, together with the detailed analysis of their initial and final morphology.

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20

Dujardin, C., C. Le Luyer, C. Martinet, C. Garapon, J. Mugnier, A. G. Murrillo, C. Pedrini, and T. Martin. "Thin scintillating films of sesquioxides doped with Eu3+." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 537, no. 1-2 (January 2005): 237–41. http://dx.doi.org/10.1016/j.nima.2004.08.017.

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21

Ovsyannikov, S. V., X. Wu, V. V. Shchennikov, A. E. Karkin, and L. Dubrovinsky. "New high-pressure–high-temperature forms in sesquioxides." Acta Crystallographica Section A Foundations of Crystallography 67, a1 (August 22, 2011): C327. http://dx.doi.org/10.1107/s0108767311091781.

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22

von Wenckstern, Holger. "Group-III Sesquioxides: Growth, Physical Properties and Devices." Advanced Electronic Materials 3, no. 9 (July 4, 2017): 1600350. http://dx.doi.org/10.1002/aelm.201600350.

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23

Fedorov, P. P., M. V. Nazarkin, and R. M. Zakalyukin. "On polymorphism and morphotropism of rare earth sesquioxides." Crystallography Reports 47, no. 2 (March 2002): 281–86. http://dx.doi.org/10.1134/1.1466504.

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24

Zelmon, David E., Jessica M. Northridge, Nicholas D. Haynes, Dan Perlov, and Klaus Petermann. "Temperature-dependent Sellmeier equations for rare-earth sesquioxides." Applied Optics 52, no. 16 (May 30, 2013): 3824. http://dx.doi.org/10.1364/ao.52.003824.

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25

Mikami, Masayoshi, and Shinichiro Nakamura. "Electronic structure of rare-earth sesquioxides and oxysulfides." Journal of Alloys and Compounds 408-412 (February 2006): 687–92. http://dx.doi.org/10.1016/j.jallcom.2005.01.068.

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26

Chen, G., and J. R. Peterson. "Systematics of the phase behavior in lanthanide sesquioxides." Journal of Alloys and Compounds 186, no. 2 (August 1992): 233–39. http://dx.doi.org/10.1016/0925-8388(92)90009-x.

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27

Sahu, P. Ch, Dayana Lonappan, and N. V. Chandra Shekar. "High Pressure Structural Studies on Rare-Earth Sesquioxides." Journal of Physics: Conference Series 377 (July 30, 2012): 012015. http://dx.doi.org/10.1088/1742-6596/377/1/012015.

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28

Petermann, K., L. Fornasiero, E. Mix, and V. Peters. "High melting sesquioxides: crystal growth, spectroscopy, and laser experiments." Optical Materials 19, no. 1 (February 2002): 67–71. http://dx.doi.org/10.1016/s0925-3467(01)00202-6.

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29

Tanner, P. A., and C. Rudowicz. "Eu3+ Ion Luminescence Crystal Structure Determination for Lanthanide Sesquioxides." Applied Spectroscopy 47, no. 1 (January 1993): 127–28. http://dx.doi.org/10.1366/0003702934048613.

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30

Kimura, Shin-ichi, Fumitaka Arai, and Mikihiko Ikezawa. "Optical Study on Electronic Structure of Rare-Earth Sesquioxides." Journal of the Physical Society of Japan 69, no. 10 (October 15, 2000): 3451–57. http://dx.doi.org/10.1143/jpsj.69.3451.

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31

Dilawar, Nita, Deepak Varandani, Shalini Mehrotra, Himanshu K. Poswal, Surinder M. Sharma, and Ashis K. Bandyopadhyay. "Anomalous high pressure behaviour in nanosized rare earth sesquioxides." Nanotechnology 19, no. 11 (February 19, 2008): 115703. http://dx.doi.org/10.1088/0957-4484/19/11/115703.

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32

Norby, Truls, Oddvar Dyrlie, and Per Kofstad. "Protonic Conduction in Acceptor-Doped Cubic Rare-Earth Sesquioxides." Journal of the American Ceramic Society 75, no. 5 (May 1992): 1176–81. http://dx.doi.org/10.1111/j.1151-2916.1992.tb05556.x.

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33

Coutures, J. P., and M. H. Rand. "Melting temperatures of refractory oxides - Part II: Lanthanoid sesquioxides." Pure and Applied Chemistry 61, no. 8 (January 1, 1989): 1461–82. http://dx.doi.org/10.1351/pac198961081461.

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34

Polfus, Jonathan M., Truls Norby, and Reidar Haugsrud. "Nitrogen defects from NH3in rare-earth sesquioxides and ZrO2." Dalton Trans. 40, no. 1 (2011): 132–35. http://dx.doi.org/10.1039/c0dt01068e.

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35

Goerigk, Felix C., Veronica Paterlini, Katharina V. Dorn, Anja-Verena Mudring, and Thomas Schleid. "Synthesis and Crystal Structure of the Short LnSb2O4Br Series (Ln = Eu–Tb) and Luminescence Properties of Eu3+-Doped Samples." Crystals 10, no. 12 (November 27, 2020): 1089. http://dx.doi.org/10.3390/cryst10121089.

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Pale yellow crystals of LnSb2O4Br (Ln = Eu–Tb) were synthesized via high temperature solid-state reactions from antimony sesquioxide, the respective lanthanoid sesquioxides and tribromides. Single-crystal X-ray diffraction studies revealed a layered structure in the monoclinic space group P21/c. In contrast to hitherto reported quaternary lanthanoid(III) halide oxoantimonates(III), in LnSb2O4Br the lanthanoid(III) cations are exclusively coordinated by oxygen atoms in the form of square hemiprisms. These [LnO8]13− polyhedra form layers parallel to (100) by sharing common edges. All antimony(III) cations are coordinated by three oxygen atoms forming ψ1-tetrahedral [SbO3]3− units, which have oxygen atoms in common building up meandering strands along [001] according to {[SbO2/2vO1/1t]–}∞1 (v = vertex-sharing, t = terminal). The bromide anions are located between two layers of these parallel running oxoantimonate(III) strands and have no bonding contacts with the Ln3+ cations. Since Sb3+ is known to be an efficient sensitizer for Ln3+ emission, photoluminescence studies were carried out to characterize the optical properties and assess their suitability as light phosphors. Indeed, for both, GdSb2O4Br and TbSb2O4Br doped with about 1.0–1.5 at-% Eu3+ efficient sensitization of the Eu3+ emission could be detected. For TbSb2O4Br, in addition, a remarkably high energy transfer from Tb3+ to Eu3+ could be detected that leads to a substantially increased Eu3+ emission intensity, rendering it an efficient red light emitting material.

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36

Glanville, SF, and GD Smith. "Aggregate breakdown in clay soils under simulated rain and effects on infiltration." Soil Research 26, no. 1 (1988): 111. http://dx.doi.org/10.1071/sr9880111.

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Wet sieving was used to separate aggregate-size distributions of four clay soils after pre-treatments of simulated rainfall, tension wetting and immersion wetting. Infiltration rates of columns of the soils were also measured under simulated rainfall. During rainfall, samples for wet sieving and the infiltrating columns were either bare or covered with a cloth mesh designed to absorb raindrop impact without affecting rates of wetting. Two swelling clay soils, one non-swelling clay soil and one clay soil dominated by sesquioxides, were used. For the first three soils, rate of wetting was the major factor governing aggregate breakdown. Significant changes in Mean Weight Diameter (MWD) occurred during the first few minutes of rainfall whether the samples were covered or not. As the rain continued, further breakdown was detected only in the uncovered samples. MWD of the sesquioxide soil decreased slightly during immersion, but most aggregate breakdown resulted from the impact of raindrops. Infiltration into the soil columns was virtually unrestricted if the soils were covered. Slaking without drop impact did not interfere with water entry. On bare soils, positive correlations were found between cumulative rainfall and the per cent of soil particles <0.12 mm diameter. An inverse relationship was found between this particle size range and infiltration rates. It is suggested that 25% of the <0.12 mm fraction must be present before infiltration rates decline.

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37

Ben Salem, M., and B. Yangui. "Domain Structures in Ferroelastic Materials: Case of Rare Earth Sesquioxides." Key Engineering Materials 101-102 (March 1995): 61–94. http://dx.doi.org/10.4028/www.scientific.net/kem.101-102.61.

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38

Peters, V., A. Bolz, K. Petermann, and G. Huber. "Growth of high-melting sesquioxides by the heat exchanger method." Journal of Crystal Growth 237-239 (April 2002): 879–83. http://dx.doi.org/10.1016/s0022-0248(01)02054-1.

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39

Dilawar, Nita, Shalini Mehrotra, D. Varandani, B. V. Kumaraswamy, S. K. Haldar, and A. K. Bandyopadhyay. "A Raman spectroscopic study of C-type rare earth sesquioxides." Materials Characterization 59, no. 4 (April 2008): 462–67. http://dx.doi.org/10.1016/j.matchar.2007.04.008.

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40

Rentería, M., L. A. Errico, A. G. Bibiloni, K. Freitag, and F. G. Requejo. "PAC Identification of Electric-Nuclear-Quadrupole Interactions in Sm-Sesquioxides." Zeitschrift für Naturforschung A 55, no. 1-2 (February 1, 2000): 155–59. http://dx.doi.org/10.1515/zna-2000-1-227.

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We present Perturbed Angular Correlation (PAC) results of the electric-nuclear quadrupole interaction at lxl Ta located at the nonequivalent cation sites of cubic C-Sm2O3 and monoclinic B-Sm2O3 free of defects. The application of the empirical Cd/Ta correlation found in binary oxides allowed us to correlate the interactions with each site and to identify the single Sm site populated in 111In-implanted B-Sm2O3 experiments. The preferential site occupation of Cd and Ta in B-Samaria is discussed in terms of the “chemistry” of the probe-atoms.

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41

Salem, M. Ben, B. Yangui, G. Schiffmacher, and C. Boulesteix. "Twinning of the hexagonal (A) structure of rare earth sesquioxides." physica status solidi (a) 87, no. 2 (February 16, 1985): 527–36. http://dx.doi.org/10.1002/pssa.2210870214.

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42

Arai, Fumitaka, Shin-ichi Kimura, and Mikihiko Ikezawa. "Resonant Photoemission Study of Electronic Structure of Rare-Earth Sesquioxides." Journal of the Physical Society of Japan 67, no. 1 (January 15, 1998): 225–29. http://dx.doi.org/10.1143/jpsj.67.225.

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43

Nagao, Mahiko, Hideaki Hamano, Koji Hirata, Ryotaro Kumashiro, and Yasushige Kuroda. "Hydration Process of Rare-Earth Sesquioxides Having Different Crystal Structures." Langmuir 19, no. 22 (October 2003): 9201–9. http://dx.doi.org/10.1021/la020954y.

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44

Tang, M., J. A. Valdez, K. E. Sickafus, and P. Lu. "Order-disorder phase transformation in ion-irradiated rare earth sesquioxides." Applied Physics Letters 90, no. 15 (April 9, 2007): 151907. http://dx.doi.org/10.1063/1.2720716.

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45

Sans, Juan Angel. "Polymorphism in sesquioxides of late Group 15: work under pressure." Acta Crystallographica Section A Foundations and Advances 75, a2 (August 18, 2019): e275-e275. http://dx.doi.org/10.1107/s2053273319092817.

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46

Kriklya, A. I. "High-temperature heat capacity of sesquioxides of rare-earth metals." Powder Metallurgy and Metal Ceramics 38, no. 5-6 (May 1999): 274–77. http://dx.doi.org/10.1007/bf02675775.

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47

Ge, Shun, Ying Zhao, Beibei Sui, and Guoqiang Shangguan. "Studies on the interaction of novel organogermanium sesquioxides with DNA." Chemical Research in Chinese Universities 31, no. 1 (January 15, 2015): 31–37. http://dx.doi.org/10.1007/s40242-015-4198-z.

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48

Wang, Qingmin, Zhi Chen, Qiang Zeng, and Runqiu Huang. "Synthesis and bioactivities of novel organogermanium sesquioxides containing?-aminophosphonate groups." Heteroatom Chemistry 10, no. 3 (1999): 209–12. http://dx.doi.org/10.1002/(sici)1098-1071(1999)10:3<209::aid-hc6>3.0.co;2-g.

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49

Chen, G., R. G. Haire, and J. R. Peterson. "Eu3+ Ion Luminescence Spectra from Lanthanide Sesquioxides Exhibiting Three Different Crystal Structures." Applied Spectroscopy 46, no. 2 (February 1992): 273–76. http://dx.doi.org/10.1366/0003702924125483.

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Abstract:

We have investigated the Eu3+ ion luminescence spectra from different host crystals of the lanthanide sesquioxides exhibiting either the A, B, or C form. The Eu3+ ion luminescence spectra from B-type Eu2O3 and from Eu3+-doped A-type La2O3 and C-type Lu2O3 were obtained at room temperature. It is suggested that the luminescence from f-f transitions in the Eu3+ ion can be used to determine the crystal structure, because the different Eu3+ ion site symmetries in the different crystal structures give rise to different characteristic spectral splitting patterns.

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50

Kolorenč, Jindřich. "Metal-Oxygen Hybridization and Core-Level Spectra in Actinide and Rare-Earth Oxides." MRS Advances 1, no. 44 (2016): 3007–12. http://dx.doi.org/10.1557/adv.2016.403.

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ABSTRACT We employ a combination of the density-functional theory and the dynamical mean-field theory to study the electronic structure of selected rare-earth sesquioxides and dioxides. We concentrate on the core-level photoemission spectra, in particular, we illustrate how these spectra reflect the integer or fractional filling of the 4f orbitals. We compare the results to our earlier calculations of actinide dioxides and analyze why the core-level spectra of actinide compounds display a substantially reduced sensitivity to the filling of the 5f orbitals.

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