首页> 外文会议>Ultrasonics Symposium (IUS), 2008 IEEE; Beijing,China >Frequency dependent properties of high permittivity PMNT piezoelectrics for ultrasonic transducer applications
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Frequency dependent properties of high permittivity PMNT piezoelectrics for ultrasonic transducer applications

机译:用于超声换能器的高介电常数PMNT压电材料的频率特性

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摘要

Pb(Zr,Ti)O3-5H piezoelectric ceramics are widely used in medical ultrasonic applications due to their high electromechanical coupling (k33 ≤ 75%). However, their relatively low clamped dielectric permittivity (≪ 1500) limits their usefulness in high frequency medical transducers with small aperture and array elements. Thus, high permittivity piezoelectric materials are desired. Relaxor based Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMNT) piezoelectrics with high permittivity and coupling have attracted much attention in medical ultrasonic applications in the form of both polycrystalline and single crystals.
机译:Pb(Zr,Ti)O 3 -5H压电陶瓷由于其高的机电耦合(k 33 ≤75%)而广泛用于医疗超声应用。但是,它们相对较低的钳制介电常数(≪ 1500)限制了它们在具有小孔径和阵列元件的高频医疗换能器中的用途。因此,需要高介电常数的压电材料。基于弛豫的Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMNT)压电具有高介电常数和耦合的多晶和单晶形式在医学超声应用中引起了很多关注。

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