Govindan Kutty, K. V. ; Asuvathraman, R. ; Mathews, C. K. ; Varadaraju, U. V. (1994) Effect of variation in frame work composition on the thermal expansivity of NZP phases Materials Research Bulletin, 29 (10). pp. 1009-1016. ISSN 0025-5408
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002554...
Related URL: http://dx.doi.org/10.1016/0025-5408(94)90081-7
Abstract
Two series of NZP compounds, NaM2(PO4)3 and NbM(PO4)3 [M = Ti, Zr, Hf, Sn and Th] have been synthesised and their thermal expansion coefficients in the temperature range 298 - 1273 K determined by using high temperature x-ray powder diffractometry. In the first series, the influence of the M - O bond is clearly seen even in the presence of the large contribution of the Na - O bond to thermal expansion; the expansivity of the lattice is found to vary with the ionic radius of the M atom. This trend is also reflected in the infra-red absorption frequencies of these compounds. In the second series, while the expansion behaviour is found to be dependent on M, the variation of expansivity with M is different from that found in the first series. The tin compounds in both the series display anomalous behaviour. We also report here, for the first time, a phase transformation in NbSn(PO4)3 around 673 K characterized by a maximum and a minimum in the lattice parameters a and c respectively.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
Keywords: | NZP Phases; Sodium; Titanium; Zirconium; Hafnium; Tin; Thorium; Niobium; Phosphate |
ID Code: | 25432 |
Deposited On: | 06 Dec 2010 13:24 |
Last Modified: | 06 Jun 2011 11:16 |
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