Ferroelasticity in [P(CH_3)_4]_2CoBr_4 Single Crystals

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概要

• 論文の詳細を見る

• The phase transition at 369.4 K in [P(CH_3)_4]_2CoBr_4 crystals has been studied using a polarizing microscope and by dielectric measurement. Domain patterns are observed on b-plate samples and are found to move under an external stress at room temperature. This shows that [P(CH_3)_4]_2CoBr_4 crystal is ferroelastic. The phase transition is found to be of the first-order, since the phase front between the high- and low-temperature phases is observed exactly at T_c. Values of the rotation angle φ(T) of the optical indicatrix from the a-axis about the monoclinic b-axis are almost constant at 44° from room temperature to near T_c, but discontinuously drop to zero at T_c. As temperature is lowered, the dielectric constant ε^'_a(T) along the a-axis shows a discontinuous drop at T_c, and then a gradual decrease below T_c. The phase transition in [P(CH_3)_4]_2CoBr_4 crystal is discussed in comparison with that in [N(CH_3)_4]_2CoBr_4 crystal.

• 社団法人日本物理学会の論文
• 1993-06-15

著者

• Tanaka Keisuke

  Department Of Cardiovascular Surgery Nagoya Daini Red Cross Hospital

• Tanaka K

  Nagoya Univ. Nagoya Jpn

• Sawada Akikatsu

  Department Of Physics Faculty Of Science Okayama University

• Sawada Akikatsu

  Department Of Applied Physics Faculty Of Engineering Nagoya University:(present Address)synthetic Cr

• Tanaka Keisuke

  Department Of Biochemistry Faculty Of Veterinary Medicine Hokkaido University

• Tanaka Keisuke

  Department Of Applied Chemistry Waseda University

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