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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. shu

Thermochemistry of Solid-State Reaction of Precursor for Preparing ZnFe₂O₄

ZHUANG Jia ^a,, ,
CHI Yan-Huab ^b ,
YU Ji ^b ,
LI Chun-Fu ^a

1.
a Institute of Material Science and Engineering, Southwest petroleum institute, Chengdu 610500;
2.
b Institute of Material Science and Engineering, Southwest University of Science and Technology, Mianyang

Corresponding author: ZHUANG Jia,
Received Date: 6 April 2006
Available Online: 12 September 2006
Fund Project: 国家自然科学基金资助项目(20271042) (20271042)

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(ΔH_{f,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 ΔH_{f,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.
- solid-state reaction,
- mixed precursor,
- thermochemistry,
- ZnFe₂O₄
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Thermochemistry of Solid-State Reaction of Precursor for Preparing ZnFe₂O₄