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Abstract <p>New double cerium(IV)-rubidium phosphates, RbCe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> and Rb<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub>·<i>х</i>H<sub>2</sub>O, have been obtained under hydrothermal conditions. Using the crystallographic parameters of isostructural compounds, the unit cell parameters of RbCe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> and Rb<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub>·<i>х</i>H<sub>2</sub>O were calculated from X-ray powder diffraction data. The following values were obtained: for RbCe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>, <i>a</i> = 17.494(1) Å, <i>b</i> = 6.7759(5) Å, <i>c</i> = 7.9831(5) Å, β = 102.875(4)°, <i>V</i> = 922.51(10), Å<sup>3</sup>, <i>Z</i> = 4 (space group <i>C</i>2/<i>c</i>); for Rb<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub>·<i>х</i>H<sub>2</sub>O, <i>a</i> = <i>b</i> = 6.8663(1) Å, <i>c</i> = 17.6562(5) Å, <i>V</i> = 832.42(3) Å<sup>3</sup>, <i>Z</i> = 4 (space group <i>I</i>4<sub>1</sub>/<i>amd</i>). Thermal behavior analysis of the synthesized compounds was performed, including phase composition determination of the thermolysis products. The results demonstrate that the initial structures exhibit relative thermal stability, with decomposition onset temperatures of approximately 500°C. At higher temperatures, progressive thermolysis leads to the formation of CePO<sub>4</sub> alongside RbPO<sub>3</sub> or Rb<sub>4</sub>P<sub>2</sub>O<sub>7</sub>, depending on conditions.</p>

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Structure and Thermal Behavior of Novel Double Ceriс Phosphates RbCe2(PO4)3 and Rb2Ce(PO4)2·xH2O

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • D. N. Vasilyeva,
  • D. A. Kozlov,
  • M. R. Protsenko,
  • N. P. Simonenko,
  • T. O. Kozlova,
  • V. K. Ivanov

摘要

Abstract

New double cerium(IV)-rubidium phosphates, RbCe2(PO4)3 and Rb2Ce(PO4)2·хH2O, have been obtained under hydrothermal conditions. Using the crystallographic parameters of isostructural compounds, the unit cell parameters of RbCe2(PO4)3 and Rb2Ce(PO4)2·хH2O were calculated from X-ray powder diffraction data. The following values were obtained: for RbCe2(PO4)3, a = 17.494(1) Å, b = 6.7759(5) Å, c = 7.9831(5) Å, β = 102.875(4)°, V = 922.51(10), Å3, Z = 4 (space group C2/c); for Rb2Ce(PO4)2·хH2O, a = b = 6.8663(1) Å, c = 17.6562(5) Å, V = 832.42(3) Å3, Z = 4 (space group I41/amd). Thermal behavior analysis of the synthesized compounds was performed, including phase composition determination of the thermolysis products. The results demonstrate that the initial structures exhibit relative thermal stability, with decomposition onset temperatures of approximately 500°C. At higher temperatures, progressive thermolysis leads to the formation of CePO4 alongside RbPO3 or Rb4P2O7, depending on conditions.