Domain structure and phase transitions of LiKSO4:EPR of SO−4 centers

Yu, Jiang Tsu; Chou, Shen Yuan

doi:10.1016/0022-3697(86)90148-4

Cited by 19 publications

(2 citation statements)

References 11 publications

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“…Single crystals are easy to grow at room temperature, but complicated domain structures or mixed phases often appear after the crystal undergoes a first order phase transition. 12 These mixed phases lead to much controversy over the actual crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

“…There are reports of the transition taking place over time frames ranging from several hours to more than a day. [14][15][16] The sequence of low temperature phase transitions in LiKSO 4 has been studied by a variety of methods, 12,14,[17][18][19][20][21] including four studies of the elastic constants immediately below room temperature. 15,16,22,23 Three of the elastic constant studies were by means of Brillouin scattering and one utilized a low-frequency torsion pendulum.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the elastic constants ofLiKSO4through a first-order structural phase transition

1996

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Resonant ultrasound spectroscopy has been used to measure the complete set of elastic constants of LiKSO 4 over the temperature range of 200 to 300 K including both the hexagonal room temperature phase and the lower temperature trigonal phase. Large step changes are observed in all the elastic constants, except C 13 , at 213 K on cooling and at 243 K on warming. These step changes are associated with the hexagonal/trigonal crystallographic phase transition. The bulk modulus is approximately 15% higher in the trigonal phase than in the hexagonal phase. The hexagonal-phase elastic constants exhibit very little temperature dependence while the trigonal-phase elastic constants show a stronger dependence on temperature. The transitions are noted to be quite sluggish, taking a few hours to equilibrate. The results are described in terms of a Landau-type free energy expansion using two Ising-like order parameters with strong coupling between the two parameters. Biquadratic coupling between the order parameters and strains is shown to account for the step changes in the elastic constants as well as the temperature dependence in the trigonal phase. Coupling linear in the strains is shown to be insufficient to explain the results.

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Section: Introductionmentioning

confidence: 99%