Issue 3, 2018

Crystal structures, phase transitions and thermal expansion properties of NaZr2(PO4)3–SrZr4(PO4)6 solid solutions

Abstract

Crystal structure evolution and temperature-dependent phase transition of solid solutions are much desired for the understanding of the optimization of functional properties. Herein, the NASICON-type NaZr2(PO4)3–SrZr4(PO4)6 solid solutions with the formula Na(2−2x)Srx[ ]xZr4(PO4)6 (0 ≤ x ≤ 1), where [ ] represents the vacancy, were prepared by the sol–gel method, and their crystal structures, phase transitions and thermal expansion properties were investigated in detail. In the range of x = 0.3–0.35, there is a reversible structural phase transition R[3 with combining macron]cR[3 with combining macron] and the different structural models of the R[3 with combining macron] phase and R[3 with combining macron]c phase were built to better understand the phase transition mechanism. We determined the phase transition boundary between the R[3 with combining macron]c and R[3 with combining macron] structures and predicted the phase transition temperature of Na(2−2x)Srx[ ]xZr4(PO4)6 with any x for further investigation of controlled physical properties. The results indicated that Na0.5Sr0.75[ ]0.75Zr4(PO4)6 showed a near zero thermal expansion in the temperature range of 450–600 K, which can find potential applications.

Graphical abstract: Crystal structures, phase transitions and thermal expansion properties of NaZr2(PO4)3–SrZr4(PO4)6 solid solutions

Supplementary files

Article information

Article type
Research Article
Submitted
10 Dec 2017
Accepted
10 Jan 2018
First published
15 Jan 2018

Inorg. Chem. Front., 2018,5, 619-625

Crystal structures, phase transitions and thermal expansion properties of NaZr2(PO4)3–SrZr4(PO4)6 solid solutions

Y. Liu, M. S. Molokeev, Q. Liu and Z. Xia, Inorg. Chem. Front., 2018, 5, 619 DOI: 10.1039/C7QI00782E

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