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

IF 1.5 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Inorganic Chemistry Pub Date : 2025-08-26 DOI:10.1134/S003602362560193X

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

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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.

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新型双磷酸铈RbCe2(PO4)3和Rb2Ce(PO4)2·xH2O的结构和热行为

在水热条件下制备了新的双磷酸铈(IV)-铷，RbCe2(PO4)3和Rb2Ce(PO4)2·хH2O。利用同结构化合物的晶体学参数，从x射线粉末衍射数据计算了RbCe2(PO4)3和Rb2Ce(PO4)2·хH2O的单位胞参数。得到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（空间群C2/c）；对于Rb2Ce(PO4)2·хH2O, a = b = 6.8663(1) Å， c = 17.6562(5) Å， V = 832.42(3) Å3, Z = 4（空间群I41/amd）。对合成的化合物进行了热行为分析，包括热裂解产物的相组成测定。结果表明，初始结构表现出相对的热稳定性，分解起始温度约为500℃。在较高的温度下，根据条件的不同，逐渐的热分解会导致与RbPO3或Rb4P2O7一起形成CePO4。

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来源期刊

Russian Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

3.10

自引率

38.10%

发文量

237

审稿时长

3 months

期刊介绍： Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.