| 硼砂热力学性质的研究 |
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| 引用本文： | 孟庆芬,谭志诚,董亚萍,陈美达,孔凡志,李武.硼砂热力学性质的研究[J].盐湖研究,2010,18(3). |
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| 作者姓名： | 孟庆芬 谭志诚 董亚萍 陈美达 孔凡志 李武 |
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| 作者单位： | 中国科学院青海盐湖研究所 中国科学院大连化学物理研究所热化学实验室 中国科学院研究生院 |
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| 基金项目： | 国家"十一五"科技支撑计划项目，国家自然科学基金项目 |
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| 摘 要： | 通过精密自动绝热量热仪测定了硼砂(Na2B4O7.10H2O)在78~345 K的热容。实验结果表明,硼砂在330~336 K温度区间有一个脱水-溶解峰,密闭加热条件下其熔点为334.38 K。用最小二乘法将脱水前的实验摩尔热容对折合温度进行拟合,得到了此温区的热容随温度变化的多项式方程,Cp,m=447.782 77+229.452 55X-49.129 89X2+21.504 25X3十24.551 12X4。用热容多项式方程进行数值积分获得了该物质在80~325 K温区每隔5 K的热力学函数值。
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| 关 键 词： | 硼砂 低温热容 热力学函数 |
Thermodynamic Properties of Borax Decahydrted |
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| MENG Qing-fen,TAN Zhi-cheng,DONG Ya-ping,CHEN Mei-d,KONG Fan-zhi,LI Wu.Thermodynamic Properties of Borax Decahydrted[J].Journal of Salt Lake Research,2010,18(3). |
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| Authors: | MENG Qing-fen TAN Zhi-cheng DONG Ya-ping CHEN Mei-d KONG Fan-zhi LI Wu |
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| Institution: | 1 (1.Qinghai Institute of Salt Lakes; Chinese Academy of Sciences; Xining; 810008; China; 2.Dalian Institute of Chemical Physics; Dalian; 116023; 3.Graduate University of Chinese Academy of Sciences; Beijing; 100039; China); |
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| Abstract: | The heat capacities of borax decahydrate(Na2B4O7· 10H2O)was measured by a precision automated adiabatic calorimeter in the temperature range from 78 to 345 K.The experimental results indicate that in the 330 ~ 336K temperature range there is a dehydration-dissolution peak.Its melting temperature is 334.38 K when heated in the closed space. Polynomial equation of the heat capacities as a function of the temperature was fitted by the least square method before dehydration.The function is as following,Cp,m= 44... |
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| Keywords: | Borax decahydrate Low heat capacities Thermodynamic function |
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