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- W2165971732 abstract "Studying the critical phenomena accompanying the order-disorder phase transition (β-δ, β-γ) in NH4Cl1–xBrx mixed crystals especially at multicritical points, the velocity and the attenuation of the longitudinal sound wave at 10 MHz propagating along the [100] direction are measured as a function of mole fraction (x = 0 to 1) and of temperature (310 to 200 K). A large critical softening of velocity is observed in the disordered β-phase of both β-δ and β-γ transitions. The results indicate that the fluctuations of two order parameters corresponding to the δ- and γ-phases have a mutual interaction through elastic strain. The critical softening is expressed by a simple power low: [V(∞)-V(0)]/V(∞) = A[(T – T0)/T] q. The critical index, q, varies with x. The fluctuations of the two order parameters in the disordered β-phase are enhanced near the triple point, and are suppressed near the tricritical point. Afin d'étudier les phénomènes critiques accompagnant les transitions d'ordre-désordre (β-δ, β-γ) dans cristaux mixtes NH4Cl1–xBrx, spécialement aux points multicritiques, la vitesse et l'atténuation de l'onde ultrasonore longitudinale à 10 MHz le long de la direction [100] ont été mesurées en fonction de la fraction molaire (x = 0 à 1) et de la température (310 à 200 K). Une grande décroissance critique de vitesse est obervées dans la phase désordonnée β des transitions β-δ et β-γ. Les résultats indiquent que les fluctuations des paramètres d'ordre correspondant aux phases δ et γ ont l'interaction mutuelle par la déformation élastique. La décrossance critique de vitesse a été exprimée par une simple loi: [V(∞)-V(0)]/V(∞) = A[(T-T0)/T0] q. L'indice critique, q varie avec x. Les fluctuations des deux paramètres d'ordre dans la phase β augmentent près du point triple et diminuent près du point tricritique." @default.
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- W2165971732 date "1978-02-16" @default.
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- W2165971732 title "Ultrasonic investigation of the phase transitions in NH4Cl1–xBrx Mixed Crystals" @default.
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- W2165971732 doi "https://doi.org/10.1002/pssa.2210450219" @default.
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