NMR study of cation motions in ferroic [C(NH2)3]3Bi2 Br9

被引：5

作者：

Grottel, M

Pajak, Z ^{[1
]}

Jakubas, R

机构：

[1] Acad Agr, Dept Phys, PL-60637 Poznan, Poland

[2] A Mickiewicz Univ, Inst Phys, PL-61614 Poznan, Poland

[3] Univ Wroclaw, Dept Chem, PL-50383 Wroclaw, Poland

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 2000年 / 55卷 / 6-7期

关键词：

phase transitions; nuclear magnetic resonance;

D O I：

10.1515/zna-2000-6-702

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The proton NMR second moment and spin-lattice relaxation time of polycrystalline [C(NH2)(3)](3)Bi2Br9 were studied in a wide-temperature range. Dynamical inequivalence of two crystallographically different guanidinium cations has been revealed. The C-3 reorientation of the two types of cations was found to be hindered by different potential barriers (25.1 kJ/mol and 34.7 kJ/mol). At higher temperatures an overall reorientation of the cations was revealed. The existence and order-disorder character of the phase transitions at 333, 350, 415, and 425 K have been confirmed.

引用

页码：570 / 574

页数：5

共 21 条

[1] RELAXATION EFFECTS IN NUCLEAR MAGNETIC RESONANCE ABSORPTION [J].