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DOI: 10.1039/A904193A (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 2907-2911

Comparison of the structural behaviour of the low thermal expansion NZP phases MTi2(PO4)3 (M = Li, Na, K)

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D. A. Woodcock and P. Lightfoot

Abstract

We present the results of high resolution neutron powder diffraction studies of the NZP phases LiTi2(PO4)3 (LiTP) and KTi2(PO4)3 (KTP). The thermal expansion coefficients for both materials are reported and compared to those of NaTi2(PO4)3. αa for LiTP is found to decrease from 0.75 to 0.27 × 10–6[thin space (1/6-em)]°C–1 between 20 and 800[thin space (1/6-em)]°C; αc is found to be constant at 30.8 × 10–6[thin space (1/6-em)]°C–1 over this temperature range. αa for KTP is found to increase from –3.2 to 2.5 × 10–6[thin space (1/6-em)]°C–1 over the same temperature range and αV to increase from –0.8 to 12.8 × 10–6[thin space (1/6-em)]°C–1. The anomalously large value of αc in LiTP is related to the thermally induced migration of Li+ from MI to MII sites, behaviour which is unique in these systems. Alamo’s model for thermal expansivity in this system is applied and parameters reported.

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