摘要
本文应用"物质吉布斯自由能法"对磷铁制备三磷化钴CoP_(3)进行了系统的热力学研究。在298~1600K范围内,Fe_(2)P与Co反应生成三磷化钴CoP_(3)的ΔG由196.12kJ·mol^(-1)变化至146.22 kJ·mol^(-1),Fe3P与Co反应生成三磷化钴CoP_(3)的ΔG由442.38kJ·mol^(-1)变化至399.21kJ·mol^(-1),在所计算温度范围不可能制备三磷化钴CoP_(3);加入适量的CaO和SiO_(2)后,相同温度下反应生成(3CaO·2SiO_(2))和CoP_(3)的ΔG对应为-42.45kJ·mol^(-1)至-108.42kJ·mol^(-1),同时计算了温度T从298K变化到700K时,其平衡常数K^(θ)为:2.73×10^(7)至1.03×10^(4)。研究结果表明:利用磷铁加Co和适量的CaO与SiO_(2)在温度低于700K真空条件下制备三磷化钴CoP_(3),不仅可行而且反应彻底,为实验研究提供了热力学参数。
The“Gibbs free energy method”was used to study the thermodynamics of CoP_(3) preparation by Fe_(2) P or Fe3 P and Co.The Gibbs free energy of the reactions varied from 196.12 kJ·mol^(-1)to 146.22 kJ·mol^(-1)and from 442.38 kJ·mol^(-1)to 399.21 kJ·mol^(-1),respectively,when the temperature is in the range of 298 K to 1600 K.It is impossible to prepare cobalt triphosphate CoP_(3) in the calculated temperature range.The Gibbs free energy that the reaction to prepare cobalt phosphate and formation 3 CaO·2 SiO_(2)added appropriate amount of CaO and SiO_(2)into the ferrophosphorus varied from-42.45 kJ·mol^(-1)to-108.42 kJ·mol^(-1)under the same temperature range.At the same time,the equilibrium constant of preparation of CoP_(3) by Fe_(2) P is from 2.73×10^(7)to 1.03×10^(4)in the temperature range of 298 K to 700 K.The results show that it is not only feasible but also thorough that the CoP_(3) can be prepared by adding Co and CaO and SiO_(2)in ferrophosphorus under the temperature of 700 K and in vacuum.It provides thermodynamic parameters for experimental study.
作者
李秋霞
普杰
荆碧
LI Qiu-xia;PU Jie;JING Bi(Faculty of Chemistry and chemical Engineering,Yunnan Normal University,Kunming 650500,China)
出处
《真空》
CAS
2021年第5期93-97,共5页
Vacuum
关键词
热力学
磷铁
制备
三磷化钴
thermodynamics
ferrophosphorus
preparation
CoP_(3)
