Infrared and EPR studies of the red potassium molybdenum bronze K0.33MoO3

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• 作者：Rui Xiong ; Jing Shi ; Qingming Xiao ; Wufeng Tang ; Hailing Liu and Decheng Tian
• 刊名：Journal of Materials Science
• 出版年：2001
• 出版时间：2001
• 年：2001
• 卷：36
• 期：22
• 页码：5511-5514
• 全文大小：72 KB

文摘

Infrared reflectance and electron-paramagnetic-resonance (EPR) of the red bronze K_0.33MoO₃are presented. The infrared measurements at 300 K indicated that red bronze K_0.33MoO₃is a semiconductor with very strong anisotropy in the range. The presence of three sharp lines at bout 900 cm–1for Pbis in fact due to the intramolecular oscillations of oxygen inside one octahedron. The phonon oscillators near 500 cm–1for Pband Pbassociate with the modification of the effective charge. The EPR signals can be attributed to electrons localized in the isolated Mo5+paramagnetic center. The difference of relative intensities of the EPR lines in 300 K and 100 K is due to the electronic excitation. The inhomogeneous broadening of the resonance lines is due to a g-factor distribution arising from crystalline field and spin-orbit coupling.