Neutron quasielastic scattering by (CH3NH3)5Bi2Cl11

被引：3
|
作者：
Jakubas, R [1 ]
Janik, JA
Krawczyk, J
Mayer, J
Stanek, T
Steinsvoll, O
机构：
[1] Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland
[2] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[3] Jagiellonian Univ, Fac Chem, PL-30060 Krakow, Poland
[4] Inst Energy Technol, N-2007 Kjeller, Norway
来源：
PHYSICA B | 1997年 / 241卷
关键词：
neutron scattering; molecular reorientation; phase transitions;
D O I：
10.1016/S0921-4526(97)00625-X
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
(CH3NH3)(+)-cation rotation in crystalline (CH3NH3)(5)Bi2Cl11 was studied by the QNS. The following (no doubt simplified) models were considered: 1. All cations are equivalent and rotate as a whole around C-N axes 2. Majority of cations behave as in point (1) and the remaining ones do not move (for the neutron observation window). 3. All CH3 groups rotate, whereas all NH3 groups do not move. The QNS measurements exclude the possibilities (1) and (3). A transition at ca. 160-170 K was confirmed in the measurements, as connected with an increase of the quasielastic component intensity observed via a dip of the EISF. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：481 / 483
页数：3
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