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Citation: Ji Shi-Shan, Li Zeng-Xi, Tan Rui-Qin, Chen Zhi-Hua, Cao Li-Li. The Study of the Oxygen Nonstoichiometry in Oxide SrCoO_3-δ[J]. Acta Physico-Chimica Sinica, ;1999, 15(07): 624-628. doi: 10.3866/PKU.WHXB19990709 shu

The Study of the Oxygen Nonstoichiometry in Oxide SrCoO_3-δ

1.
Department of Chemistry,Tsinghua University,Beijing 100084

Received Date: 13 October 1998
Available Online: 15 July 1999

The sample 0f SrCoO3-δ was prepared by ammonium nitrate (NH4NO3) co-melted method and the structure of which was characterized by XRD and thermal analysis. The relationship between the oxygen nonstochiometry and the oxygen pressure and temperature was studied under the conditions of temperature 672 - 918 K and the oxygen pressure 0.7 - 59. 3 kPa. The model of the oxygen deficiency formation was firstly suggested and the mathematic formula describing the phase equilibrium of the SrCoO3 -δ-O2 system was given. The general applicability of the deficiency model was evaluated for the example of SrFeO3- δ. The enthalpy change and the entropy change of the SrCoO3-δ-O2 system in the process of dissolving oxygen were measured to be (75. 3 ±1. 2) kJ•mol-1 and (96. 7 ±1. 5) J•mol-1.K-1 respectively.
- Strontium cobaltate complex oxide,
- Nonstoichiometry,
- Oxygen deficiency model,
- Enthalpy change,
- Entropy change
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The Study of the Oxygen Nonstoichiometry in Oxide SrCoO3-δ

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The Study of the Oxygen Nonstoichiometry in Oxide SrCoO_3-δ