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Abstract <p>Solid-phase exchange is a promising method in the synthesis of functional materials, including micro- and nanoscale ones. The mechanism and energy of a reaction are determined by the exchange of parts of the involved molecules. The subject matter of this work is spinel-forming solid-phase exchange in systems containing Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>, Cr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> and some divalent 3<i>d</i>-metal sulfates together with lithium, sodium, and potassium oxide compounds. Thermodynamic calculations show that the heat of the reaction and self-heating temperatures exceeding 1000 K are sufficient for spinels to be produced in exothermic self-propagating reactions in these systems.</p>

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Thermodynamics of Solid-Phase Exchange Synthesis of 3d-Metal Spinels in Oxide–Salt Systems

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • V. V. Shapovalov,
  • A. A. Berestovaya,
  • O. Yu. Svetlakov,
  • V. O. Gromenko

摘要

Abstract

Solid-phase exchange is a promising method in the synthesis of functional materials, including micro- and nanoscale ones. The mechanism and energy of a reaction are determined by the exchange of parts of the involved molecules. The subject matter of this work is spinel-forming solid-phase exchange in systems containing Al2(SO4)3, Cr2(SO4)3 and some divalent 3d-metal sulfates together with lithium, sodium, and potassium oxide compounds. Thermodynamic calculations show that the heat of the reaction and self-heating temperatures exceeding 1000 K are sufficient for spinels to be produced in exothermic self-propagating reactions in these systems.