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Compositional and pressure effects on the phase transition in ferroelectric NH4H(ClH2CCOO)2.
Autorzy
Rok wydania
2005
Czasopismo
Numer woluminu
316
Strony
97-101
DOI
10.1080/00150190590963192
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The effects of pressure and of the substitution of Rb+ for the ammonium cations on the dielectric responce in NH 4 H(ClH 2 CCOO) 2 (AHCA) crystals have been studied using electric permittivity measurements. The transition temperature (T c ) decreases with the pressure increasing up to 800 MPa and pressure coefficient dT c /dp = −1.4*10− 2 [K/MPa] has been experimentally determined. In mixed crystals with different Rb+ admixture proportion, T c lowers considerably and additional electric permittivity anomaly is clearly evidenced. The results are discussed assuming a model which combines polarizability effects related to the heavy ion units with the pseudospin tunnelling model.
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