On the transition to the X-phase in highly brominated Betaine Calcium Chloride Dihydrate (BCCD)

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Vieira, LG (Author) Other; Ribeiro, JL (Author) Other; Hernandez, O (Author) Other; Quilichini, M (Author) Other; Almeida, A (Author) FCUP; Chaves, MR (Author) FCUP; Klopperpieper, A (Author) Other

Journal

Title: Ferroelectrics

Vol. 240

Pages: 1435-1442

ISSN: 0015-0193

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 1 Citation

Other information

Authenticus ID: P-001-1G5

DOI: 10.1080/00150190008227967

Abstract (EN): We report dielectric and optical birefringence measurements in 38% brominated BCCD, which confirm the transition to the X-phase, at ambient pressure, around T-c=80 K. These results are compared with elastic neutron scattering data. A coexistence of the parent Pnma phase with the X-phase is observed in a large range of temperature centered at about T-c. It is found that the mosaic spread of the crystal varies strongly and irreversibly when a temperature cycle Pnma - X-phase - Pnma is performed. A 30% brominated BCCD has also been investigated by elastic neutron scattering. For this compound, an intermediate incommensurate phase occurring between T(1)approximate to 111 K and T(c)approximate to 50 K is observed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8