Anomalous Elastic Properties of Fe_2TiO_4

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概要

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• The temperature dependence of elastic constants c_<11>-c_<12> and c_<44> of Fe_<2.05>Ti_<0.95>O_<4.00> is measured by the ultrasonic pulse echo method, using a small (110) platelet with approximate dimension of 5×7×1.346mm, for the temperature range of 77°∼300° K. c_<11>-c_<12> decreases anomalously with decreasing temparature in the paramagnetic phase, whereas c_<44> increases. An extraordinarily large attenuation is observed around the Curie temperature in the 110 shear mode which couples to c_<11>-c_<12>. The elastic constants obtained, c_<11>-c_<12>=0.265×10^<12>dyne/cm^2 and c_<44>=0.396×10^<12>dyne/cm^2 at room temperature, are almost an order of magnitude smaller than those of magnetite and spinel, and provide a reasonable explanation for the giant magnetostriction observed in the crystal. The soft mode in the crystal is interpreted to be due to the Jahn-Teller relaxation effect of Fe^<2+> ions in the tetrahedral site.

• 1971-08-05

著者

• Syono Yasuhiko

  Institute For Materials Research Tohoku University

• Ishikawa Yoshikazu

  Department Of Materials Science And Technology Hirosaki University

• Fukai Yuh

  Department Of Physics Chuo University

• Syono Yasuhiko

  Institute For Solid State Physics University Of Tokyo:(present Address) Research Institute For Iron

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