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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).
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