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本文用全自动绝热量热计从13到300K测定了两种稀土元素异硫氰酸盐七水合物,La(NCS)_3·7H_2O和Ce(NCS)_3·7H_2O的热容。较详细描述了量热计结构和操作。在实验温区对两种化合物均未观察到明显的热异常现象。根据实验热容数据,用最小二乘拟合方法得到了计算这两种化合物13—300K热容值的多项式方程。13K以下的热容值用Debye和Einstein热容函数进行了估算。计算出了O—300K的标准热力学函数,标准生成Gibbs能也被计算出来。
In this paper, the heat capacities of two kinds of rare earth isothiocyanates heptahydrate, La (NCS) 3 · 7H 2 O and Ce (NCS) 3 · 7H 2 O were measured from 13 to 300 K with an automatic adiabatic calorimeter. Described in more detail calorimeter structure and operation. No significant thermal anomalies were observed for both compounds in the experimental temperature zone. Based on the experimental heat capacity data, a polynomial equation for calculating the heat capacity of 13-300 K for both compounds was obtained by the least squares fitting method. The heat capacity below 13K was estimated using the Debye and Einstein heat capacity functions. The standard thermodynamic function of O-300K was calculated and the standard Gibbs energy was also calculated.