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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 4    December 1995

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HIGH-TEMPERATURE HEAT CAPACITIES OF THE PHASES IN Y-Ba-Cu-O SYSTEM
Zhang Hengzhong; Fang Zheng; Zhang Pingmin; Chen Xinmin

Department of Chemistry; Central South University of Technology; Changsha 410083

Abstract:TG and DSC techniques were used to investigate the phases and the reaction behavior at elevated temperatures of the oxygen-nonstoichiometric compounds YBa2Cu3O7-x and BaCuO2+x Based on the results of TG and DSC experiments,appropriate procedures were found for heat capacity measurements of the phases with DSC method.Combined with the drop method,the heat capacities of the phases YBa2Cu3O6.90,Y2Cu2O5,Y2BaCuO5 and BaCuO2.42 were measured from room temperature to 973 K.The results for these phases are represented respectively as follows:
Cp(J/mol·K)=333.97-454.43×10-3T+41.836×105T-2+794.18×10-6T2
Cp(J/mol·K)=149.82+113.02×10-3T
Cp(J/mol·K)=329.09-361.56×10-3T-42.745×105T-2+341.43×10-6T2
Cp(J/mol·K)=77.628-14.018×10-3T+18.141×105T-2+130.85×10-6T2.

 

Key words: heat capacity; high-temperature; DSC; TG; superconductor; Y-Ba-Cu-O system

ISSN 1672-7029
CN 43-1423/U

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