The pressure influence on the incommensurate-commensurate ferroelectric phase transition in [4-NH2C5H4NH][SbCl4] |
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| Authors: | M Zdanowska-Fra¸czek R Jakubas |
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| Institution: | a Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Smoluchowskiego 17, 60-194 Poznań, Wielkopolska, Poland
b Faculty of Chemistry, Wroc?aw University, 50-385 Wroc?aw, Joliot-Curie 14, Poland |
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| Abstract: | The dielectric properties of the 4-NH2C5H4NH] SbCl4 (abbreviated as 4-APCA) crystal were investigated under hydrostatic pressure up to 300 Mpa. The pressure-temperature phase diagram was given. The paraelectric-ferroelectric phase transition (II→III) temperature (Tc) increases linearly with increasing pressure with a slope dTc/dp=21×10−2 K/MPa. The pressure dependence of Curie-Weiss constants has been evaluated also. In the paraelectric phase (II) the Curie constant (C+) was pressure dependent whereas the C− constant over the ferroelectric phase (III) was almost constant. The results are interpreted in terms of improper and displacive type phase transition model with a soft phonon at a zone boundary. |
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| Keywords: | 71 45 Gm 77 84 Fa 77 22 Ch 77 80 Bh |
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