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本文首次报告了用热重—差热(TG～DTA)联合研究了三草酸基合铬(Ⅲ)酸钾的固相合成及在空气气氛中的热分解过程。测定了合成产物和热分解后固相物质的电子光谱,实验结果表明:K_3[Cr(C_2O_4)_3]的固相合成和热分解均是氧化还原反应。结果准确,方法可靠。
This paper reports for the first time the thermogravimetry-differential thermal analysis (TG-DTA) to study the solid state synthesis of trioxalatoxy potassium chromium (Ⅲ) and the thermal decomposition process in air. The electronic spectra of the synthesized products and the solid materials after thermal decomposition were determined. The experimental results show that the solid phase synthesis and thermal decomposition of K_3 [Cr (C_2O_4) _3] are both redox reactions. The result is accurate and the method is reliable.