Hostname: page-component-76c49bb84f-kjkt6 Total loading time: 0 Render date: 2025-07-05T22:59:52.740Z Has data issue: false hasContentIssue false
  • English
  • Français

Crystal structure and powder data of davidite-type La2Ti10.27Ga9.63O38

Published online by Cambridge University Press:  10 January 2013

A. Meden ,
D. Kolar  and
S. Škapin
A. Meden
Affiliation:
University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškerčeva 5, 1000 Ljubljana, Slovenia
D. Kolar
Affiliation:
University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškerčeva 5, 1000 Ljubljana, Slovenia
S. Škapin
Affiliation:
Jožef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
Get access Rights & Permissions [Opens in a new window]

Abstract

The structure type of La2Ti10.27Ga9.63O38 was revealed by a search-match using the PDF. A successful Rietveld refinement (Rp=8.9, Rwp=13.3, RB=4.20) confirmed the structure to be rhombohedral (space group R3¯, No. 148) with the refined unit cell parameters a=9.1878(1) Å, α=68.458(1)°, and V=646.374(1) Å3. The structure is compared to other compounds of the davidite type, and the observed and calculated powder data are given.

Keywords

La2Ti10.27Ga9.63O38davidite-typeRietveld refinement

Information

Type
Research Article
Information
Powder Diffraction , Volume 14 , Issue 1 , March 1999 , pp. 36 - 41
Copyright
Copyright © Cambridge University Press 1999

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.)

Article purchase

Temporarily unavailable

References

Fleischer, M., and Mandarino, J. A. (1991). Glossary of Mineral Species (The Mineralogical Record, Inc., Tucson), p. 49.Google Scholar
Fuierer, P. A., and Newham, R. E. (1991). “La 2Ti 2O 7 Ceramics,” J. Am. Chem. Soc. 74, 2876–2881.Google Scholar
Gatehouse, B. M., Grey, I. E., and Kelly, P. R. (1979). “The crystal structure of davidite,” Am. Mineral. 64, 1010–1017.Google Scholar
Goldstein, J. I., Newbury, D. E., Echlin, P., Joy, D. C., Romig, A. D., Lyman, C. E., Fiori, C., and Lifshin, E. (1992). Scanning Electron Microscopy and X-Ray Microanalysis (Plenum, New York).CrossRefGoogle Scholar
Larson, A. C., and Von Dreele, R. B. (1990). “General structure analysis system,” LAUR 86-748 Report, Los Alamos National Laboratory.Google Scholar
MacChesney, J. B., and Sauer, H. A. (1962). “The system La 2O 3–TiO 2; Phase equilibria and electrical properties,” J. Am. Chem. Soc. 45, 416–422.Google Scholar
Negas, T., Yeager, G., Bell, S., and Amren, R. (1991). “Chemistry and properties of temperature compensated microwave dielectrics,” in Chemistry of Electronic Ceramic Materials, edited by P. K. Davies and R. S. Roth (NIST Spec. Publication 804), pp. 21–37.Google Scholar
Pabst, A. (1961). “X-ray crystallography of davidite,” Am. Mineral. 46, 700–718.Google Scholar
Powder Diffraction File, JCPDS-International Centre for Diffraction Data, Newtown Square Corporate Campus, 12 Campus Boulevard, Newtown Square, PA 19073-3273.Google Scholar
Reed, S. B. (1975). Electron Microprobe Analysis (Cambridge University Press, Cambridge).Google Scholar
Samardžija, Z., Škapin, S., and Kolar, D. (1996). “Microstructure and EPMA study of the La 2O 3–TiO 2–Ga 2O 3 oxide compounds,” EMAS European Microbeam Analysis Society, 2nd Regional Workshop on Electron Probe Microanalysis of Materials Today–Practical Aspects, May 1996, Balatonfured, Hungary, Proceedings, pp P-58–59.Google Scholar
Škapin, S., Kolar, D., and Suvorov, D. (1993). “X-ray diffraction and microstructural investigation of the Al 2O 3–La 2O 3–TiO 2 system,” J. Am. Chem. Soc. 76, 2359–2362.Google Scholar
Suvorov, D., Valant, M., Škapin, S., and Kolar, D. (in press). “Microwave dielectric properties of ceramics along the La 2/3TiO 3(STAB)–LaAlO 3 tie line,” J. Mater. Sci.Google Scholar