Thermal expansion of phosphates with the NaZr2(PO4)3 structure containing lanthanides and zirconium: R0.33Zr2(PO4)3 (R = Nd, Eu, Er) and Er0.33(1–x) Zr0.25xZr2(PO4)3

• Published in: Crystallography reports Vol. 60; no. 5; pp. 721 - 728
• Main Authors: Volgutov, V. Yu, Orlova, A. I.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2015
• Subjects: Crystallography and Scattering Methods; Lattice Dynamics and Phase Transitions; Physics; Physics and Astronomy; HfNb; Crystallography Report; Extreme Term; Oxoanion; Zirconium Phosphate
• ISSN: 1063-7745; 1562-689X
• DOI: 10.1134/S1063774515050193

Phosphates R 0.33 Zr 2 (PO 4 ) 3 ( R = Nd, Eu, or Er) and Er 0.33(1– х ) Zr 0.25 Zr 2 (PO 4 ) 3 ( х = 0, 0.25, 0.5, 0.75, 1.0) of the NaZr 2 (PO 4 ) 3 family have been synthesized and investigated by high-temperature X-ray diffraction. The crystallochemical approach is used to obtain compounds with expected small and controllable thermal-expansion parameters. Phosphates with close-to-zero thermal-expansion parameters, including those with low thermal-expansion anisotropy, have been obtained: Nd 0.33 Zr 2 (PO 4 ) 3 with α a =–2.21 × 10 −6 °С −1 , α c = 0.81 × 10 −6 °С −1 , and Δα = 3.02 × 10 −6 °С –1 and Er 0.08 Zr 0.19 Zr 2 (PO 4 ) 3 with α a =–1.86 × 10 −6 °С −1 , α c = 1.73 × 10 −6 °С −1 , and Δα = 3.58 × 10 −6 °С −1 .