Synthesis, Structure and Thermophysical Properties of Phosphates MNi0.5Zr1.5(PO4)3 (M = Mg, Ca, Sr)

M. V. Sukhanov; I. A. Schelokov; V. I. Petkov; E. R. Gobechiya; Yu. K. Kabalov; A. V. Markin; N. N. Smirnova

doi:10.18321/ectj51

Authors

M. V. Sukhanov Lobachevsky State University of Nizhni Novgorod, pr. Gagarina, 23, Nizhni Novgorod, 603950, Russia
I. A. Schelokov Lobachevsky State University of Nizhni Novgorod, pr. Gagarina, 23, Nizhni Novgorod, 603950, Russia
V. I. Petkov Lobachevsky State University of Nizhni Novgorod, pr. Gagarina, 23, Nizhni Novgorod, 603950, Russia
E. R. Gobechiya Lomonosov Moscow State University, Leninskie gory, Moscow, 119992, Russia
Yu. K. Kabalov Lomonosov Moscow State University, Leninskie gory, Moscow, 119992, Russia
A. V. Markin Lobachevsky State University of Nizhni Novgorod, pr. Gagarina, 23, Nizhni Novgorod, 603950, Russia
N. N. Smirnova Lobachevsky State University of Nizhni Novgorod, pr. Gagarina, 23, Nizhni Novgorod, 603950, Russia

DOI:

https://doi.org/10.18321/ectj51

Abstract

New phosphates MNi_0.5Zr_1.5(PO₄)₃ (M = Mg, Ca, Sr) were prepared by the precipitating method. Phosphates were characterized using X-ray powder diffraction, IR-spectroscopy and electron microprobe analyses. The crystal structure of phosphates was refined by the Rietveld method. Phosphates CaNi_0.5Zr_1.5(PO₄)₃ and SrNi_0.5Zr_1.5(PO₄)₃ are shown to have been crystallized in the NaZr₂(PO₄)₃-type structure and the phosphate MgNi_0.5Zr_1.5(PO₄)₃ was obtained as a single-phase with Sc₂(WO₄)₃-type structure. Heat capacity of phosphate CaNi_0.5Zr_1.5(PO₄)₃ was measured in the range 7 – 650 K and increased monotonically over the entire temperature range studied. Thermal expansion of phosphate CaNi_0.5Zr_1.5(PO₄)₃ was studied in the interval 295-1073 K by the high temperature X-ray diffraction. This phosphate is similar to the best low-expansion ceramics, such as zircon, cordierite and silica glass in thermal expansion behavior.

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