Abstract

To study the isotope effect of glycinium phosphite (GPI), temperature dependences of the 5 0 \bar6 and 3 0 \bar10 structure factors of GPI and the 11 0 \bar3 and 9 0 \bar8 structure factors of deuterated GPI (DGPI) were analyzed in the ferroelectric phase by using the quasi-one-dimensional Ising model. The Ising model reproduces well the behavior of all the structure factors in the wide temperature region. The parameters for the intrachain and interchain interactions are determined to be 312 and 7.1 K for GPI, and 477 and 8.4 K for DGPI on average, respectively.

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