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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Strong ultrasonic microwaves in ferroelectric ceramics
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Strong ultrasonic microwaves in ferroelectric ceramics

机译：铁电陶瓷中的强超声波微波

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摘要

It is well known that ferroelectric materials have piezoelectricnproperties which allow the transformation of electrical signals intonmechanical signals and vice versa. The transducer action normally isnrestricted to frequencies up to the mechanical resonance frequency ofnthe sample. There are, however, two mechanisms which allow transducernaction in ferroelectric ceramics at much higher frequencies: one is thennormal piezoelectric effect in a ferroelectric ceramic in which thencrystallites have periodic domain structures, the other is a domain wallneffect in which ferroelastic domain walls in a periodic domain structurenare powerful shear wave emitters. Both mechanisms give rise to extensivendielectric losses in ceramics at microwave frequencies
机译：众所周知，铁电材料具有压电性质，其允许电信号转变为机械信号，反之亦然。换能器的动作通常不受限于样品的机械共振频率以下的频率。但是，有两种机制可以在铁电陶瓷中以更高的频率进行换能：一种是铁电陶瓷中的正常压电效应，其中微晶具有周期性畴结构，另一种是畴壁效应，其中铁磁弹性畴壁在周期性畴中结构是强大的剪切波发射器。两种机制都会导致微波频率下陶瓷的大量介电损耗

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