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Citation: Du Shao-Bin, Zheng Hong-Yuan, Ma Fu-Tai, Lv Guang-Lie. Investigation of the Reducibility of La_2-xSr_xNiO₄ System and the Study of Reducible Mechanism for La_1.7Sr_0.3NiO₄[J]. Acta Physico-Chimica Sinica, ;1991, 7(01): 10-15. doi: 10.3866/PKU.WHXB19910102 shu

Investigation of the Reducibility of La_2-xSr_xNiO₄ System and the Study of Reducible Mechanism for La_1.7Sr_0.3NiO₄

1.
Department of Chemistry, Hangzhou University; Central Laboratory Hangzhou University

Received Date: 4 July 1989
Available Online: 15 February 1991

A series of La_(2-x)Sr_xNiO_4(0.0≤x≤1.0) oxides with the tetra nal K_2NiF_4 structure were prepared. The cell parameters were measured by powder X-ray diffraction (XRD) technique; the reducibility was determined by temperature programmed reduction(TPR). Results show that the changing orders of the highest reducing peak temperature with composition(x) contrast to that of cell parameter a, but agree with that of c. The reducing mechanism for La_(1.7)Sr_(0.3)NiO_4 was investigated by TPR and XRD technique. We found that the first two reducing peaks in TPR profile correspond mainly to the reducing process from Ni~(3+) ion to Ni~(2+). This point was also identified by the calculation of axial ratio indirectly; therefore the highest reducing peak is the structural destroying peak.
- La_2-xSr_xNiO₄; La_1.7Sr_0.3NiO₄; XRD technique; TPR
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Investigation of the Reducibility of La2-xSrxNiO4 System and the Study of Reducible Mechanism for La1.7Sr0.3NiO4

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通讯作者: 陈斌, bchen63@163.com

Investigation of the Reducibility of La_2-xSr_xNiO₄ System and the Study of Reducible Mechanism for La_1.7Sr_0.3NiO₄