论文信息 - On the pressure-temperature phase diagram of NH4HSeO4 crystal: Acoustical treatment

On the pressure-temperature phase diagram of NH4HSeO4 crystal: Acoustical treatment

Abstract The pressure-temperature phase diagram of NH4HSeO4 crystals were studied in the vicinity of normal-incommensurate and incommensurate-commensurate (ferroelectric) phase transitions using the acoustical measurements. It is shown, that incommensurate phase disappears under the influence of hydrostatic pressure in the triple point (Pt = 460 MPa, Tt = 237 K).

A. Kityk | O. Vlokh | A. Zadorozhna | Z. Czapla

[1] R. Poprawski. Reexamination of the influence of hydrostatic pressure on phase transition in nh4HSeO4, CRYSTALS , 1991 .

[2] F. Dénoyer,et al. X-ray powder diffraction study of the superionic phase in NH4HSeO4 , 1988 .

[3] H. Pykacz. Dielectric hysteresis in the incommensurate phase of NH4HSeO4 under electric field , 1988 .

[4] J. Fousek,et al. Proof of the existence of the lifshitz point in NH4HSeO4 , 1988 .

[5] A. Novak,et al. X-ray diffraction study of NH4HSeO4 and ND4DSeO 4 , 1987 .

[6] C. Pawlaczyk. Dielectric indications on the incommensurate - commensurate phase transition in NH4HSeO4 at 250 K , 1986 .

[7] J. Rączka,et al. A new phase transition in NH4HSeO4 crystals , 1981 .

[8] L. Sobczyk,et al. Ferroelectric Properties of NH4HSeO4 Crystals , 1979, February 16.

[9] Emmanuel P. Papadakis,et al. Ultrasonic Phase Velocity by the Pulse‐Echo‐Overlap Method Incorporating Diffraction Phase Corrections , 1967 .

[10] More,et al. Neutron investigation of incommensurability and metastability in NH4HSeO , 1989, Physical review. B, Condensed matter.