Please use this identifier to cite or link to this item: http://hdl.handle.net/11717/3538
Title: Effect of variation in frame work composition on the thermal expansivity of NZP phases
Authors: Govindan Kutty, K.V.
Asuvathraman, R.
Mathews, C.K.
Varadaraju, U.V.
Keywords: Anisotropy; Atoms; Composition effects; Crystal lattices; Niobium compounds; Phase transitions; Sodium compounds; Thermal expansion; Thermal stress; Tin compounds; X ray analysis; Chemical bond; Ionic radius; X ray diffraction; Phosphates
Issue Date: 1994
Citation: Materials Research Bulletin, 29(10), 1009-1016
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. ? 1994.
URI: http://dx.doi.org/10.1016/0025-5408(94)90081-7
http://hdl.handle.net/11717/3538
ISSN: 255408
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