Elastic Properties of the Ferroelectric Crystal of Ammonium Fluoroberyllate (NH_4)_2BeF_4

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概要

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• Young's moduli along [100], [010], [0013, [011], [1013, [110] by composite-barresonator method and sound velocities of longitudinal and transverse waves along[100], [010], [001] by pulse echo method are measured in the ferroelectric crystal of(NH.).BeF. over a range from - 150'C to l50'C. All the elastic constants are ob-tained by a least square method. A method to obtain the elastic compliance constants.5., .5., and .5.. from six measurements (.s'.., ,5.., ,s'., c.., c.., c..) is also proposed.Anomalies in constants except c, are explained by a phenomenological theory in-cluding higher order terms. The anomaly in c, is, however, shown due to the coupl-ing of a normal coordinate Q(B..) at f-point with a strain .s', both belonging to B...

• 社団法人日本物理学会の論文
• 1989-02-15

著者

• SASAKI Yukihiko

  The University of Electro-Communications

関連論文

• Elastic Properties of Rhombohedral PLZT Ceramics : A: APPLICATIONS AND FUNDAMENTALS
• Elastic Anomaly of the Antiferroelectric CsH_3(SeO_3)_2 Single Crystal
• Electromechanical Properties of the Ferroelectric Crystal NaH_3(SeO_3)_2near the Curie Point
• Elastic Properties of the Ferroelectric Crystal of Ammonium Fluoroberyllate (NH_4)_2BeF_4
• Measurement of Elastic Compliance Constants of Antiferroelectric Copper Formate Single Crystals

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