1.
Acta Crystallogr B
; 57(Pt 3): 296-302, 2001 Jun.
Article
in English
| MEDLINE
| ID: mdl-11373387
ABSTRACT
The structures of the high- and low-temperature phases of 38% brominated BCCD [betaine (trimethylammonioacetate) calcium chloride dihydrate], the latter being known as the X-phase, have been determined by single-crystal neutron diffraction at 295 and 20 K, respectively. The symmetry of the X-phase is described by the P2(1)2(1)2(1) space group. The distortion with respect to the high-temperature Pnma phase is characterized by anti-symmetric displacements of the betaine molecules as well as of the Ca octahedra. On the basis of a symmetry-mode analysis, we propose an interpretation of the direct phase transition that occurs around 80 K between these two phases.
2.
Phys Rev B Condens Matter
; 54(13): 9162-9173, 1996 Oct 01.
Article
in English
| MEDLINE
| ID: mdl-9984645
3.
Phys Rev B Condens Matter
; 52(2): 798-802, 1995 Jul 01.
Article
in English
| MEDLINE
| ID: mdl-9980655
4.
Phys Rev B Condens Matter
; 51(6): 3899-3901, 1995 Feb 01.
Article
in English
| MEDLINE
| ID: mdl-9979210
5.
Phys Rev B Condens Matter
; 50(22): 16751-16753, 1994 Dec 01.
Article
in English
| MEDLINE
| ID: mdl-9976068
6.
Phys Rev B Condens Matter
; 48(18): 13318-13325, 1993 Nov 01.
Article
in English
| MEDLINE
| ID: mdl-10007724
7.
Phys Rev B Condens Matter
; 48(9): 5852-5856, 1993 Sep 01.
Article
in English
| MEDLINE
| ID: mdl-10009118
8.
Phys Rev B Condens Matter
; 46(5): 3098-3100, 1992 Aug 01.
Article
in English
| MEDLINE
| ID: mdl-10004005
9.
Phys Rev B Condens Matter
; 45(17): 9576-9582, 1992 May 01.
Article
in English
| MEDLINE
| ID: mdl-10000839
10.
Phys Rev B Condens Matter
; 43(13): 11162-11165, 1991 May 01.
Article
in English
| MEDLINE
| ID: mdl-9996853
11.
Phys Rev B Condens Matter
; 42(13): 8537-8547, 1990 Nov 01.
Article
in English
| MEDLINE
| ID: mdl-9995029
12.
Phys Rev B Condens Matter
; 41(4): 2343-2347, 1990 Feb 01.
Article
in English
| MEDLINE
| ID: mdl-9993970
13.
Phys Rev B Condens Matter
; 39(16): 12320-12323, 1989 Jun 01.
Article
in English
| MEDLINE
| ID: mdl-9948079