Ferroelastic to paraelastic phase transition of K3H(SeO4)(2) and Rb3H(SeO4)(2) single crystals studied by nuclear magnetic resonance and external stress
- Authors
- Lim, Ae Ran; Ham, Shin Gyoon; Chang, Jin-Hae; Ichikawa, M.
- Issue Date
- Feb-2007
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, v.244, no.2, pp 775 - 782
- Pages
- 8
- Journal Title
- PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
- Volume
- 244
- Number
- 2
- Start Page
- 775
- End Page
- 782
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26806
- DOI
- 10.1002/pssb.200541464
- ISSN
- 0370-1972
1521-3951
- Abstract
- The temperature dependences of the nuclear magnetic resonance (NMR) and the stress-strain hysteresis curves have been measured for K3H(SeO4)(2) and Rb3H(SeO4)(2) crystals grown using the slow evaporation method. By analysis of the K-39 and Rb-87 NMR results, it has been confirmed that the phase below T-C is ferroelastic with twin domains and that the phase above T-C is paraelastic with a single domain. The ferroelastic domain switching that occurs in the two single crystals due to external stress was also studied. The critical stress values for converting the twin-domain state to the single-domain state were obtained. When external stresses of 0.6 and 0.4 MPa were applied to the K3H(SeO4)(2) and Rb3H(SeO4)(2) crystals, respectively, transitions from twin-domain to single-domain states were observed. The ferroelastic domain switching resulting from an external stress may be associated with the atomic rearrangements of the SeO4 tetrahedra in K3H(SeO4)(2) and Rb3H(SeO4)(2) crystals; the ferroelastic domain switching is explained by the restriction of the rotation of the SeO4 tetrahedra as a result of the breaking of all hydrogen bonds by the external stress. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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