Isotope effect in the phase transition of partially d euterated T1H2As 04 |
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Authors: | Sung-KI Lee Kwang-SEI Lee |
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Affiliation: |
a Department of Physics, Inje University, Kyungnam, Korea |
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Abstract: | The complex dielectric constant of Tl(H1-X DX)2AsO4 powder pellets has been measured from 100 to 450 K. It is found that the I11 ← 11 phase transition point (TL) shifts from 251 K(for hydrogenated crystal) to about 340 K(for partially deuterated crystal), while the I1 ← I phase transition point(TU) goes from about 390 K to 433 K. The order of the I11 ← I1 phase transition changes from a weakly first-order to a second- order, while that of the I1 ← I phase transition from a second-order to a first-order. From the experimental results, the tentative phase diagrams of Tl(H1-X DX)2AsO4, and Tl(H1-X DX)2PO4 are proposed. |
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