Enthalpies of formation of some phases present in the Y−Ba−Cu−O system by solution calorimetry期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Enthalpies of formation of some phases present in the Y−Ba−Cu−O system by solution calorimetry

Authors:	Zhang Hengzhong Fang Zheng Zhang Pingmin Chen Xinmin

Affiliation:	(1) Department of Chemistry, Central South University of Technology, 410083 Changsha, Hunan, China

Abstract:	Enthalpies of some of the phases in the Y–Ba–Cu–O system were determined by solution calorimetry using a Calvet microcalorimeter. The standard enthalpies of formation for the phases were found to be YBa₂Cu₃O_6.60, –2627.9; YBa₂Cu₃O_6.77, –2641.8; YBa₂Cu₃O_6.90, –2652.0; YBa₂Cu₃O_6.99, –2659.3; Y₂Cu₂O₅, –2198.6; Y₂BaCuO₅, –2656.4; BaCuO_2.33, –788.6; and BaCuO_2.42, –796.2 kJ-mol^–1.

Keywords:	Enthalpy of formation solution calorimetry superconductor Y– Ba– Cu– O system
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