PROTON DISORDER AND PHASE-TRANSITION IN KHCO3

被引：29

作者：

ECKOLD, G ^{[1
]}

GRIMM, H ^{[1
]}

STEINARSIC, M ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH,INST FESTKORPERFORSCH,W-5170 JULICH,GERMANY

来源：

PHYSICA B | 1992年 / 180卷

关键词：

D O I：

10.1016/0921-4526(92)90751-D

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Similar to many carboxylic acids, potassium bicarbonate KHCO3 forms centrosymmetric, hydrogen bonded dimers in the crystalline state. Incoherent neutron scattering has been used for the determination of the effective double minimum potential (DMP) which governs the concerted two-proton jump. The influence of the acoustic instability at Tc congruent-to 320 K is found to be reflected in a critical variation of the asymmetry of the DMP. A staggered fluctuation of the dimer orientation strongly coupled to the hydrogen transfer is suggested as the primary order parameter.

引用

页码：336 / 338

页数：3

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