High Frequency Needle Ultrasonic Transducers Based on Lead-Free Co Doped Na(0.5)Bi(4.5)Ti(4)O(15) Piezo-Ceramics

This paper describes the design, fabrication, and characterization of tightly focused (ƒ-number close to 1) high frequency needle-type transducers based on lead-free Na(0.5)Bi(4.5)Ti(3.975)Co(0.025)O(15) (NBT-Co) piezo-ceramics. The NBT-Co ceramics, are fabricated through solid-state reactions, have...

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Detalles Bibliográficos
Autores principales: Fei, Chunlong, Zhao, Tianlong, Wang, Danfeng, Quan, Yi, Lin, Pengfei, Li, Di, Yang, Yintang, Cheng, Jianzheng, Wang, Chunlei, Wang, Chunming, Zhou, Qifa
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6187828/
https://www.ncbi.nlm.nih.gov/pubmed/30424224
http://dx.doi.org/10.3390/mi9060291
Descripción
Sumario:This paper describes the design, fabrication, and characterization of tightly focused (ƒ-number close to 1) high frequency needle-type transducers based on lead-free Na(0.5)Bi(4.5)Ti(3.975)Co(0.025)O(15) (NBT-Co) piezo-ceramics. The NBT-Co ceramics, are fabricated through solid-state reactions, have a piezoelectric coefficient d(33) of 32 pC/N, and an electromechanical coupling factor k(t) of 35.3%. The high Curie temperature (670 °C) indicates a wide working temperature range. Characterization results show a center frequency of 70.4 MHz and a −6 dB bandwidth of 52.7%. Lateral resolution of 29.8 μm was achieved by scanning a 10 μm tungsten wire target, and axial resolution of 20.8 μm was calculated from the full width at half maximum (FWHM) of the pulse length of the echo. This lead-free ultrasonic transducer has potential applications in high resolution biological imaging.

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