High-temperature performance of Mn-doped CaBi sub(4)Ti sub(4)O sub(1 5)/Pb(Zr,Ti)O sub(3) ultrasonic transducers

• Published in: Japanese Journal of Applied Physics Vol. 53; no. 7S; pp. 07KB10 - 1-07KB10-5
• Main Authors: Inada, Yusuke, Inoue, Takuo, Kobayashi, Makiko, Nagata, Hajime, Takenaka, Tadashi
• Format: Journal Article
• Language: English
• Published: 01.01.2014
• Subjects: Constants; Electrical resistivity; Lead zirconate titanates; Manganese; Nondestructive testing; Optimization; Piezoelectricity; Signal to noise ratio; Sol gel process
• ISSN: 0021-4922; 1347-4065
• DOI: 10.7567/JJAP.53.07KB10

Mn-doped CaBi sub(4)Ti sub(4)O sub(1 5)/Pb(Zr,Ti)O sub(3) sol-gel composites were developed for nondestructive testing up to approximately 800 K. A small amount of Mn was added to CaBi sub(4)Ti sub(4)O sub(1 5) in order to improve sensitivity and signal-to-noise ratio of the composites at high temperatures. The amount of MnCO sub(3) added was optimized by resistivity measurement. After the Mn dopant amount optimization, 50- mu m-thick films of pure CaBi sub(4)Ti sub(4)O sub(1 5)/ Pb(Zr,Ti)O sub(3), Mn doped CaBi sub(4)Ti sub(4)O sub(1 5)/Pb(Zr,Ti)O sub(3), and Bi sub(4)Ti sub(3)O sub(12)/PZT were fabricated onto 3.3-mm-thick titanium substrates for comparison purpose. All sol-gel composites were manufactured by spray coating. First, the piezoelectric constant d sub(33) was measured at room temperature. Then the samples with different poling temperatures were tested at various temperatures up to approximately 800 K and measured of their ultrasonic performance characteristics, including sensitivity and signal-to-noise ratio.