The influence of hydrostatic pressure on the ferroelectric phase transition in (NH4)2BeF4

Sorge, G.; Frenzel, C.

doi:10.1002/pssa.2210220151

Cited by 7 publications

(2 citation statements)

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“…Other dielectric measurements have been performed in which the decrease of T, with hydrostatic pressure have been studied using the dielectric anomaly (Shirokov and Skoromkhova, 1974;Sorge and Frenzel, 1974;Gesi and Ozawa, 1974) as well as the increase of T, with biasing electric field (Sorge and Freidank, 1974). Such data could now be well used for estimating some constants in the thermodynamic theories of the INC phase of AFB.…”

Section: (Nh4)bef4mentioning

confidence: 99%

Dielectric and light scattering spectroscopy of incommensurate phases in crystals

Petzelt

1981

Phase Transitions

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Dielectric and light scattering spectroscopy are the most sensitive methods for the direct observation of low-frequency excitations in incommensurate phases. In several cases they have been successfully used for the observation of amplitudon and phason modqs. Whereas the amplitudon below the normal-incommensurate transition temperature behaves in a similar way to soft modes at common structural transitions, the phason represents a qualitatively new feature of incommensurate phases. All the corresponding experimental data published up to the middle of 1980 are reviewed and consistently interpreted taking into account the specific selection rules recenily derived. The necessary theoretical background is discussed qualitatively. C 0 NTE NTS

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Section: (Nh4)bef4mentioning

confidence: 99%

Dielectric and light scattering spectroscopy of incommensurate phases in crystals

Petzelt

1981

Phase Transitions

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“…But there are some differences in the shape of the curves on the temperature dependence of E between the results reported in (5, 3), on the one hand and those of Shirokov et al on the other hand. Here we report detailed studies on E and E under influence of hydrostatic pressure up to 1200 atm and on the tem-X Y perature dependence of the hydrostatic electrostriction coefficient Q The experimental procedure was nearly the same as reported in (14). With thickness of about 0.7 mm and areas of 2.5x4.5 mm for x-cuts and thickness of 0.8 mm and areas pf 2.5x7.4 mm for y-cuts') their capacitances amounted to ss 11.5 pF and % 15 pF at room temperature, respectively.…”

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confidence: 99%