Incommensurate Phase in γ-Irradiated RbH3(SeO3)2 and RbD3(SeO3)2
1984 年 53 巻 1 号 p. 235-243
詳細
1984 年 53 巻 1 号 p. 235-243
ESR spectra and dielectric constant of γ-irradiated RbH3(SeO3)2 and RbD3(SeO3)2 were measured simultaneously around the phase transition temperature (TC). It has been confirmed that in these substances with the doze of about 5 Mard, an incommensurate phase appears in the temperature range of about 4∼6 K above TC and the range broadens slightly with the increase of doze. From the analysis of temperature dependence of A tensor for SeO2− radical, it is clarified that SeO3(II) in RbD3(SeO3)2 rotates in a quite similar way with that in RbH3(SeO3)2 below TC. It was found for the first time that in RbD3(SeO3)2 the dielectric constant peak along the a-axis at TC is much larger than that along the b-axis. On these results some discussion is presented.
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