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Ultrasonic attenuation in an α-LiIO_3 single crystal has been measured in the [001],[010] and[100] directions at low temperatures by using the standard pulse echo method.It is clear thatultrasonic attenuation anisotropy exists in α-LiIO_3 above 273 K and disappears below 273 K. 相似文献
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In α-LiIO_3 crystal,the attenuation coefficient of longitudinal wave is increased by the action of anelectrostatic field,if the direction of wave propagating and the field are along the same c-axis of the crystal.The change of the attenuation coefficient with time possesses a relaxation character.We believe that thisphenomenon may be caused by the interaction between the longitudinal wave and the unilaterally moving 相似文献
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用脉冲回波重合法测量α-LiIO_3的弹性模量 总被引:1,自引:0,他引:1
本文根据线性压电耦合方程的解,用10MHz超声脉冲回波重合法,测量了沿α-LiIO_3单晶不同对称方向传播的纵波和横波声速,给出了α-LiIO_3晶体的弹性模量(×10~-10N/m~2):C(~E_11)8.293,C(~E_13)2.862,C(~E_33)5.68,C(~E_44)1.78.C(~E_66)2.489C(~D_11)8.384,C(~D_13)3.264.C(~D_33)7.256,C(~D_44)2.84,C(~D_66)2.489 相似文献
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α-LiIO_3具有优良的光学性质和较强的压电效应,在实际中有广泛的应用。对α-LiIO_3的大量研究工作中,发现在静电场作用下,它具有一系列的特殊性质:光衍射增强、中子衍射增强、介电常数增加以及“低温冻结”等。当α-LiIO_3单晶作为声学器件使用时,了解它的声学性质是很重要的。α-LiIO_3的电弹常数已经测得,本文的目的是测量国产α-LiIO_3的超声衰减的温度关系。 相似文献
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