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Structural investigations of AgNbO$$_3$$ phases using high-energy X-ray diffraction

Yoneda, Yasuhiro   ; Yoshii, Kenji  ; Kohara, Shinji*

The structures and phase transitions of AgNbO$$_3$$ were investigated using high-energy X-ray powder diffraction. Bragg reflections have revealed the high temperature M$$_3$$-O, O-T, and T-C phase transitions but have not given any significant evidence of low temperature M$$_1$$-M$$_2$$ and M$$_2$$-M$$_3$$ ones. The existence of structural disorder in the T and O phases was indicated by diffuse scattering. Here we again confirm the average structure of AgNbO$$_3$$. The refined structure was essentially the same as previous reports. With isotropic thermal parameters, refinements of the structures at most temperatures resulted in larger Ag thermal parameters. Disorder feature of Ag coupled with the thermal parameters and exhibit as diffuse scattering in T and O phases.

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