Phase Transition Structural Changes of Rb_2Cd_2(SO_4)_3 Investigated by Electron Paramagnetic Resonance of the Tl^<2+>Ion

概要

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The electron paramagnetic resonance (EPR) of the Tl" center in RbzCdz(SO,3)3 was inves-tigated in the temperature range 10 K to 140 K. Special attention was paid to the Rb' sitesurrounded by nine oxygens. The sttrdies show that at the ctrbic -+monoclinic phase transition,at 130 K, that block of oxygens rotates alrnost rigidly around one of the (Oil) crystallographicaxes. The angle of rotation changes alcrtrptly at the transition temperature and increases linearlywith decreasing tenuperature in the taaonaoclinic phase. The spectra show no evidence for the cellmultiplication observed in X-ray diffraction. Additional changes of the EPR spectra were ob-served at 101 K and 68 K. Between those two temperatttres the spectra seenu to be consistentwith a triclinic synametry. Below 68 K the spectra becoune rnore complex, which contrasts withthe higher symnaetry of the orthorhoraubic plaase previotrsly attributed to the crystal.
社団法人日本物理学会の論文
1996-04-15