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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Zhou, D. Haosu Luo |
| Copyright Year | 2008 |
| Description | Author affiliation: Shanghai Inst. of Ceramics, Chinese Acad. of Sci., Shanghai (Zhou, D.; Haosu Luo) |
| Abstract | Electromechanical coefficients of $k_{t},$ $k_{33}'$ and $k_{33}$ of $(1-x)Pb(Mg_{1/3}Nb_{2/3})O_{3}-xPbTiO_{3}$ (PMN-PT) single crystals were mainly investigated for various medical ultrasonic applications. The [001] poled PMN-PT wafers exhibit relatively high $k_{t}$ (62%), which is larger than that (49%) of conventional $Pb(Zr_{1-x},$ $Ti_{x})O_{3}$ (PZT) ceramics. Accordingly, the pulse wave of 2MHz TCD probe manufactured with the PMN-PT wafers show high-quality performances compared with PZT probe. The bandwidth of the PMN-PT probe is 10% broader and its sensitivity is 4dB higher than the PZT probe. The coupling coefficient $k_{33}'$ is a key indicator for medical linear and phase array ultrasonic transducers. Different orientations and poling directions have benn invenstiaged to optimize the properties of PMN-PT. The optimized cut types of PMN-PT for array applications were obtained and its $k_{33}'$ ~93%, which is larger than that (70%) of conventional PZT ceramics. The simulations for the linear array transducer show the advancements of PMN-PT single crystals. 25% increased bandwidth is expected compared with PZT arrays. Based on the longitude extension mode $(k_{33}),$ the PMN-PT/Epoxy 1-3 composites were modeled and fabricated. The holistic $k_{t}$ (> 90%) of the composites far exceeds that of the PZT ceramics (only ~50%). The relatively low acoustic impedance makes the acoustic matching to human tissue much easier. The results would be favorable for single element ultrasonic transducers, especially in Doppler blood flow imaging applications. |
| Starting Page | 168 |
| Ending Page | 170 |
| File Size | 1989607 |
| Page Count | 3 |
| File Format | |
| ISBN | 9781424424283 |
| DOI | 10.1109/ULTSYM.2008.0041 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-11-02 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Acoustic applications Ferroelectric materials Crystals Probes Biomedical imaging Bandwidth Phased arrays Ultrasonic transducer arrays Ultrasonic transducers Ceramics electromechanical coefficients vibration mode PMN-PT single crystals ultrasonic transducer |
| Content Type | Text |
| Resource Type | Article |
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