Investigation of zirconium phosphate Zr3(PO4)4 during heating |
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| Authors: | A. I. Orlova S. G. Samoĭlov G. N. Kazantsev V. Yu. Volgutov D. M. Bykov A. V. Golubev E. Yu. Borovikova |
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| Affiliation: | (1) Nizhni Novgorod State University, pr. Gagarina 23, Nizhni Novgorod, 603950, Russia;(2) Institute of Physics and Power Engineering, Federal State Unitary Enterprise of the State Research Center of the Russian Federation, pl. Bondarenko 1, Obninsk, Kaluzhskaya oblast, 249020, Russia;(3) Moscow State University, Moscow, 119992, Russia |
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| Abstract: | Zirconium phosphate Zr3(PO4)4 has been synthesized by the sol-gel technique and investigated using X-ray powder diffraction, IR spectroscopy, and differential scanning calorimetry. It has been established that the symmetry of the unit cell, R (bar 3) c, which is characteristic of the NaZr2(PO4)3 (NZP) family, is lowered to P (bar 3) c. The behavior of the zirconium phosphate during heating has been examined using high-temperature X-ray diffraction at temperatures ranging from 25 to 575°C. It has been revealed that the structure of the zirconium phosphate is hardly subjected to expansion due to heating in the temperature ranges 25–125°C (α a < 1 × 10?6 K?1, α c < 1 × 10?6 K?1, Δα < 1 × 10?6 K?1) and 325–575°C (α a = ?1.4 × 10?6 K?1, α c < 1 × 10?6 K?1, Δα < ?2.4 × 10?6 K?1). In the temperature range 125–325°C, the synthesized compound undergoes a second-order phase transition (upon heating), which is accompanied by the contraction of the structure along all crystallographic directions. Upon cooling in the range from 75 to 25°C, the phase transition is accompanied by the expansion of the structure. |
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