Nalini, G. and Somashekar, R. and Row, T. N. G. (2001) X-ray structure refinements and strain analysis of substituted cubic lead pyrochlores Pb-2(M2-yPby)O7-delta(0.0 < y < 0.8; M = Nb or Ta). Journal of Solid State Chemistry, 156 (1). pp. 207-212.
Full text not available from this repository. (Request a copy)Abstract
The phase diagrams in the PbO-Nb2O5 system and the PbO-Ta2O5 system depict pyrochlore structure at certain molar ratios. Compositions Pb2Nb1.51Pb0.49O6.30 (1), Pb2Ta1.4Pb0.6O6.21 (2), and Pb2Ta1.25Pb0.75O6.57 (3) belonging to this family, are refined in the cubic space group Fd Fd(3) over bar m (Z = 8; lattice parameter 10.762(1), 10,744(1), 10.757(5) Angstrom, respectively) using the Rietveld refinement approach. The analyses suggest that the B-site is partially occupied by Pb leading to the general formula Pb-2(M2-yPby)O7-delta(0.0 < y < 0.8; M = Nb or Ta), There is an overall broadening observed in the X-ray peak widths in 1, 2, and 3 compared to the Pb-deficient parent phases. It is observed that the X-ray peak widths of 2 is broad, while 3 displays narrow peak widths. It is found via strain analysis that the line broadening observed correlates with the strain in the lattice, (C) 2001 Academic Press.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | pyrochlore; Rietveld refinement; strain analysis; lead niobates; lead tantalates |
| Subjects: | D Physical Science > Physics |
| Divisions: | Department of > Physics |
| Depositing User: | Harisha R uom |
| Date Deposited: | 31 Jan 2020 05:43 |
| Last Modified: | 31 Jan 2020 05:43 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/10137 |
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