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HEAT CAPACITY AND THERMODYNAMIC PROPERTIES OF CR2AS FROM 5 TO 1000K

机译:5至1000K的CR2AS的热容量和热力学性质

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摘要

The heat capacity of Cr,As was measured from 5 to 1000 K by adiabatic shield calorimetry. At a temperature of 298.15 K, C-p,C-m is found to be 79.56 J K-1 mol(-1), [S-m(T) - S-m(0)] is 91.42 J K-1 mol(-1) and [(H-m(T) - H-m(0)] is 14510 J K-1 mol(-1), where as at 1000 K, C-p,C-m is 103.1 J K-1 mol(-1), [S-m(T) - S-m(0)] is 201.8 J K-1 mol(-1) and [(H-m(T) - H-m(0)] is 79750 J K-1 mol(-1). A lambda-type contribution to the heat capacity with maximum at similar to 394 K is due to magnetic disordering of the antiferromagnetic compound, The clearly cooperative part of the transitional entropy is only 1.3 J K-1 mol(-1) over the region 300 to 450 K. The excess heat capacity above that of the lattice plus dilation and conduction electron contributions at temperatures above 150 K indicates that the magnetic excitations persist over a much wider temperature range. [References: 24]
机译:Cr,As的热容通过绝热屏蔽量热法在5至1000 K之间测量。在298.15 K的温度下,发现Cp,Cm为79.56 J K-1 mol(-1),[Sm(T)-Sm(0)]为91.42 J K-1 mol(-1)和[[ Hm(T)-Hm(0)]为14510 J K-1 mol(-1),其中在1000 K时,Cp,Cm为103.1 J K-1 mol(-1),[Sm(T)-Sm (0)为201.8 J K-1 mol(-1),[(Hm(T)-Hm(0)]为79750 J K-1 mol(-1)。最大值在类似于394 K时是由于反铁磁性化合物的无序性所致。在300至450 K区域内,过渡熵的明显协作部分仅为1.3 J K-1 mol(-1)。在150 K以上的温度下,晶格加上膨胀和传导电子的贡献表明磁激发在更宽的温度范围内持续存在[参考文献:24]

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