Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-02T22:02:10.298Z Has data issue: false hasContentIssue false

Preparation and structural characterization of the rare-earth oxides BaR2O4, R=Pr, Tb

Published online by Cambridge University Press:  10 January 2013

C. Cascales*
Affiliation:
Instituto de Ciencia de Materiales, CSIC. Serrano 113, E-28006 Madrid, Spain
I. Rasines
Affiliation:
Instituto de Ciencia de Materiales, CSIC. Serrano 113, E-28006 Madrid, Spain
*
a)To whom correspondence should be addressed.

Abstract

The compounds BaR2O4, (R = Pr, Tb), where R are two of the less frequent trivalent lanthanides, have been prepared under reducing atmosphere from mixtures of BaO2, the R metals, and the oxides Pr2O3 and Tb4O7, respectively. The crystal structure of BaR2O4 have been refined from X-ray powder diffraction data by the Rietveld method of profile analysis using 31 parameters in each case. Both oxides are orthorhombic, isotypic with SrY2O4, of the perovskite-related CaFe2O4 structure type, S.G. Pnma (No. 62), Z = 4, a = 10.6113(8), b = 3.6303(3), c = 12.485(1) Å, and V = 480.93(5) Å3 for R = Pr; and a = 10.4282(8), b = 3.4893(3), c = 12.1809(6) Å, and V = 443.22(3) Å3 for R = Tb. The R–O distances vary between 2.15(6) to 3.40(6) Å for R = Pr, and between 2.15(3) to 2.91(5) Å for R = Tb.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Appelman, D. E., and Evans, H. T. (1973). Indexing and Least-squares Refinement of Powder Diffraction Data (U.S. Geological Survey, Washington DC).Google Scholar
Barry, T. L., and Roy, R. (1967). J. Inorg. Nucl. Chem. 29, 12431248.CrossRefGoogle Scholar
Bergerhoff, G., Hundt, R., and Sievers, R. (1992). Crystal Structure Information System (Fachinformationszentrum, Karlsruhe).Google Scholar
Bertaut, E. F., Chappert, J., Apostolov, A., and Semenov, V. (1966). Bull. Soc. Franç. Minéral. Crist. 89, 206212.Google Scholar
Bhargava, K. D., Kovba, L. M., Martynenko, L. I., and Spitsyn, V. I. (1965). Dokl. Akad. Nauk SSSR 161, 594596.Google Scholar
Costa, G. A., Ferretti, M., Fornasini, M. L., Franceschi, E. A., and Olcese, G. L. (1989). Powder Diffr. 4 (1), 2425.CrossRefGoogle Scholar
Decker, B. F., and Kasper, J. S. (1957). Acta Crystallogr. 10, 332337.CrossRefGoogle Scholar
Fischer, R. X. (1985). J. Appl. Cryst. 18, 258262.CrossRefGoogle Scholar
Hill, P. M., Peiser, H. S., and Rait, J. R. (1956). Acta Cryst. 9, 981986.CrossRefGoogle Scholar
Krüger, J., and Müller-Buschbaum, H. (1983). Rev. Chim. Minér. 20, 456461.Google Scholar
Krúger, J., and Müller-Buschbaum, H. (1984). Z. anorg. allg. Chem. 512. 5964.Google Scholar
Longo, V., Ricciardiello, F., and Minichelli, D. (1981). J. Mater. Sci. 16, 35033505.CrossRefGoogle Scholar
Lopato, L. M., Maister, I. M., and Shenvchenko, A. V. (1972). Dopov. Akad. Nauk. Ukr. RSR, Ser. B 34, 245248.Google Scholar
Lopato, L. M., Yaremenko, Z. A., and Tresvyatskii, S. G. (1965). Dopov. Akad. Nauk. Ukr. RSR 11, 14931497.Google Scholar
Marcano, C. M., and Rasines, I. (1985). Inorg. Chim. Acta 109, L15–L16.CrossRefGoogle Scholar
Müller-Buschbaum, H. (1968). Z. anorg. allg. Chem. 358, 138146.Google Scholar
Müller-Buschbaum, H., and Scheikowski, M. (1990). Z. anorg. allg. Chem. 591, 181187.Google Scholar
Parada, C., Alonso, J. A., and Rasines, I. (1986). Inorg. Chim. Acta 111, 197199.CrossRefGoogle Scholar
Rietveld, H. H. (1969). J. Appl. Cryst. 2, 6571.CrossRefGoogle Scholar
Rodriguez-Carvajal, J. (1990). Proceedings of the Satellite Meeting of the XVth Congress of the International Union of Crystallography, p. 127.Google Scholar
Roth, R. S. (1964). Progress in the Science and Technology of the Rare Earths, edited by Eyring, L. (Pergamon, New York), pp. 168178.Google Scholar
Schwarz, H., and Bommert, D. (1964). Z. Naturforsch. 19b, 955956.CrossRefGoogle Scholar
Shannon, R. D. (1976). Acta Crystallogr. A 32, 751767.CrossRefGoogle Scholar
Villars, P., and Calvert, L. D. (1991). Pearson's Handbook of Crystallographic Data for Intermetallic Phases (The Materials Information Society, Materials Park, OH 44073), 2nd ed., Vols. 2 and 4.Google Scholar
Wiles, D. B., and Young, R. A. (1982). J. Appl. Cryst. 15, 430438.Google Scholar
Wong-Ng, W. (1992). Powder Diffr. 7, 125133.CrossRefGoogle Scholar
Wong-Ng, W., and Paretzkin, B. (1991). Powder Diffr. 6, 187189CrossRefGoogle Scholar