引用本文:
庄稼, 迟燕华, 吁霁, 李春福. ZnFe2O4前驱物固相合成反应的热化学[J]. 应用化学,
2007, 24(3): 282-285.
Citation: ZHUANG Jia, CHI Yan-Huab, YU Ji, LI Chun-Fu. Thermochemistry of Solid-State Reaction of Precursor for Preparing ZnFe2O4[J]. Chinese Journal of Applied Chemistry, 2007, 24(3): 282-285.
Citation: ZHUANG Jia, CHI Yan-Huab, YU Ji, LI Chun-Fu. Thermochemistry of Solid-State Reaction of Precursor for Preparing ZnFe2O4[J]. Chinese Journal of Applied Chemistry, 2007, 24(3): 282-285.
ZnFe2O4前驱物固相合成反应的热化学
English
Thermochemistry of Solid-State Reaction of Precursor for Preparing ZnFe2O4
Abstract:
A mixed oxalate precursor of ZnFe2O4 was prepared from Fe(NO3)3·9H2O, Zn(NO3)2·6H2O and H2C2O4·2H2O by solid-state reaction at room temperature. According to Hass low, a circulating system of the chemical reactions was designed to determine the ΔH values of reactants and resultants in the reaction. The standard formation enthalpy of Fe2(C2O4)3·5H2O(ΔHf,Fe2(C2O4)3·5H2O(s)) was calculated with the ΔH values. An isopiestic reaction calorimeter with constant surrounding temperature was used, and hydrochloric acid (3 mol/L) was employed as the solvent for calorimetric experiments. The standard formation enthalpy ΔHf,Fe2(C2O4)3·5H2O(s) is -4 082.29 kJ/mol. The enthalpy of the solid state reaction to prepare the precursor of ZnFe2O4 was calculated to be 406.21 kJ/mol, indicating that the reaction is endothermic.
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Key words:
- solid-state reaction
- / mixed precursor
- / thermochemistry
- / ZnFe2O4
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