Phenomenological model for the phase-transition sequence in betaine calcium chloride dihydrate

1990 ◽  
Vol 41 (4) ◽  
pp. 2343-2347 ◽  
Author(s):  
J. L. Ribeiro ◽  
J. C. Tolédano ◽  
M. R. Chaves ◽  
A. Almeida ◽  
H. E. Müser ◽  
...  
Keyword(s):  
Phase Transition ◽  
Calcium Chloride ◽  
Phenomenological Model ◽  
Chloride Dihydrate ◽  
Transition Sequence ◽  
Calcium Chloride Dihydrate

The phase transition sequence in betaine calcium chloride dihydrate by adiabatic calorimetry

1994 ◽  
Vol 50 (4) ◽  
pp. 227-237 ◽  
Author(s):  
J. M. Igartua ◽  
I. Ruiz-Larrea ◽  
T. Breczewski ◽  
A. López-Echarri
Keyword(s):  
Phase Transition ◽  
Calcium Chloride ◽  
Adiabatic Calorimetry ◽  
Chloride Dihydrate ◽  
Transition Sequence ◽  
Calcium Chloride Dihydrate

Dielectric constant and phase transition sequence in betaine calcium chloride dihydrate

1989 ◽  
Vol 1 (43) ◽  
pp. 8011-8020 ◽  
Author(s):  
J L Ribeiro ◽  
M R Chaves ◽  
A Almeida ◽  
J Albers ◽  
A Kloepperpieper ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Calcium Chloride ◽  
Chloride Dihydrate ◽  
Transition Sequence ◽  
Calcium Chloride Dihydrate

On the Phase Transition Sequence in Deuterated Betaine Calcium Chloride Dihydrate under Hydrostatic Pressure

1995 ◽  
Vol 189 (1) ◽  
pp. 97-105 ◽  
Author(s):  
M. R. Chaves ◽  
A. Almeida ◽  
J. M. Kiat ◽  
J. C. Tolédano ◽  
J. Schneck ◽  
...  
Keyword(s):  
Phase Transition ◽  
Hydrostatic Pressure ◽  
Calcium Chloride ◽  
Chloride Dihydrate ◽  
Transition Sequence ◽  
Calcium Chloride Dihydrate

Structure of the X-phase of 38% brominated betaine calcium chloride dihydrate

2001 ◽  
Vol 57 (3) ◽  
pp. 296-302
Author(s):  
L. G. Vieira ◽  
O. Hernandez ◽  
J. L. Ribeiro ◽  
A. Cousson ◽  
J.-M. Kiat ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Calcium Chloride ◽  
Mode Analysis ◽  
Chloride Dihydrate ◽  
Two Phases ◽  
Calcium Chloride Dihydrate ◽  
Symmetry Mode

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 P212121 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.

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