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Abstract <p>The phosphates A<sub>2</sub>Zr<sub>1.5</sub>Mg<sub>0.5</sub>(PO<sub>4</sub>)<sub>3</sub> (A = K, Rb, Cs) with a langbeinite structure are of interest as environmentally stable crystalline forms for radwaste immobilization. The phosphates were obtained by the sol-gel method and characterized by X-ray diffraction and electron microprobe analysis (EMPA). The enthalpies of drop-solution in a sodium molybdate melt (3Na<sub>2</sub>O⋅4MoO<sub>3</sub>) at 973 K were measured by high-temperature calorimetry. The standard enthalpies of formation from oxides (∆<sub>f,ox</sub><i>H</i>°) and elements (∆<sub>f,el</sub><i>H</i>°) at 298.15 K were calculated from the obtained experimental data. The energy stabilization of the zirconium–magnesium framework in a series of alkali cations was analyzed.</p>

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Thermochemistry of Framework Zirconium Phosphates A2Zr1.5Mg0.5(PO4)3 (A = K, Rb, Cs) with a Langbeinite Structure

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • A. K. Korytseva,
  • A. V. Knyazev,
  • V. E. Popov,
  • I. A. Bazhenova,
  • V. V. Cheverikin

摘要

Abstract

The phosphates A2Zr1.5Mg0.5(PO4)3 (A = K, Rb, Cs) with a langbeinite structure are of interest as environmentally stable crystalline forms for radwaste immobilization. The phosphates were obtained by the sol-gel method and characterized by X-ray diffraction and electron microprobe analysis (EMPA). The enthalpies of drop-solution in a sodium molybdate melt (3Na2O⋅4MoO3) at 973 K were measured by high-temperature calorimetry. The standard enthalpies of formation from oxides (∆f,oxH°) and elements (∆f,elH°) at 298.15 K were calculated from the obtained experimental data. The energy stabilization of the zirconium–magnesium framework in a series of alkali cations was analyzed.