Ferroelectric order in highly disordered molecular-ionic crystals

被引：36

作者：

Pajak, Z ^{[1
]}

Czarnecki, P ^{[1
]}

Szafranska, B ^{[1
]}

Maluszynska, H ^{[1
]}

Fojud, Z ^{[1
]}

机构：

[1] Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.69.132102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ordering of the anionic sublattice at the coexisting high orientational disorder of the cationic sublattice produces spontaneous polarization in imidazolium tetrafluoroborate [C3N2H5](+)[BF4](-). This ferroelectric crystal exhibits the Curie point at 297.0 K and undergoes two other polymorphic phase transitions at 213.6 and 187.8 K. In spite of its pentagonal ring the dynamically disordered polar cation is localized at a special position on the threefold axis of the highly symmetrical rhombohedral unit cell. Thus it does not contribute immediately to the spontaneous polarization which originates predominantly from the behavior of the distorted tetrahedral fluoroborate anion.

引用

页码：132102 / 1

页数：3

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