Abstract
The authors observed the 77 Se hyperfine (hf) components of ESR spectrum of SeO 4 3- radicals doped in 94%-deuterated NH 4 H 2 PO 4 (D 0.94 ADP) and compared the result with those for D x ADP (0≦ x ≦0.70) crystals. In tlte paraelectric phase no remarkable deuteration effect was observed. In the antiferroelectric (AFE) phase, on the other hand, a new type of angular dependence of the hf line-position was found between about 185 K and T c (236 K). The results mean that the crystal field of the AFE host crystal which distorts the SeO 4 3- into the AFE configuration depends on temperature remarkably in the AFE D 0.94 ADP.
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