Dilatometric Study on the Successive Phase Transitions in (NH_4)_3H (SO_4)_2
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Linear thermal expansions of (NH.)3H(SO.). were measured both by an X-raydiffractometer and by a dilatometer in a temperature range between 100 K atud450 K covering the four phase transitions. The crystal exhibits a large anisotropyin the linear thermal expansion coefficients measured along the pseudo-orthorhombic a., b. and c. axes. Of thermal expansion coefficients along thethree axes, the coefficient observed near but above the transition temperatureT'.'(265 K) shows the largest anomalous temperature dependence along the c.axis. The coefficient observed near but above the transition temperature 7'!"(140 K), however, shoes relatively large anomalies in the plane perpendicularto the c(, axis.
- 社団法人日本物理学会の論文
- 1979-10-15
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