Relaxor Single-Crystal Plates with Nano-Size Ferroelectric Domains Applying to Ultrasonic Prove for Medical Uses

Toshio Ogawa; Taiki Ikegaya

doi:10.4028/www.scientific.net/AST.102.57

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 102Relaxor Single-Crystal Plates with Nano-Size...

Relaxor Single-Crystal Plates with Nano-Size Ferroelectric Domains Applying to Ultrasonic Prove for Medical Uses

Abstract:

Sound velocities were measured in relaxor single-crystal plates, included in piezoelectric transducers for medical uses, using an ultrasonic precision thickness gauge with high-frequency pulse generation. The velocities were compared with the ones of piezoelectric ceramics in order to clarify characteristics of the single crystals. Estimating the difference in the sound velocities and elastic constants in the single crystals and ceramics, it was possible to evaluate effects of domain and grain boundaries on elastic constants. Existence of domain boundaries in single crystal affected the decrease in Young’s modulus, rigidity, Poisson’s ratio and bulk modulus. While existence of grain boundaries affected the decrease in Young’s modulus and rigidity, Poisson’s ratio and bulk modulus increased. It was thought these phinomina come from domain alignment by DC poling, and both the boundaries act as to absorb mechanical stress by defects due to the boundaries. In addition, the origin of piezoelectricity in single crystals is caused by low bulk modulus and Poisson’s ratio, and high Young’s modulus and rigidity in comparison with ceramics. On the contrary, the origin of piezoelectricity in ceramics is caused by high Poisson’s ratio by high bulk modulus, and furthermore, low Young’s modulus and rigidity due to domain alignment.

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Periodical:

Advances in Science and Technology (Volume 102)

Pages:

57-64

DOI:

https://doi.org/10.4028/www.scientific.net/AST.102.57

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Online since:

October 2016

Authors:

Toshio Ogawa*, Taiki Ikegaya

Keywords:

Domain Boundary, Elastic Constants, Grain Boundary, Piezoelectric Ceramics, Relaxor Single Crystals, Sound Velocities, Transducers for Medical Uses

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References

[1] LE. Cross, Relaxor ferroelectrics, Ferroelectrics 76 (1987) 241-267.

Google Scholar

[2] Y. Yamashita, Study on lead scandium niobate piezoelectric ceramics, Doctor dissertation of Waseda Univ. 1998 (in Japanese).

Google Scholar

[3] B. Jaffe, WR. Cook, H. Jaffe, Piezoelectric ceramics, Academic Press, London, (1971).

Google Scholar

[4] J. Kuwata et al., Dielectric and piezoelectric properties of 0. 91Pb(Zn1/3Nb2/3)O3-0. 09PbTiO3 single crystals, Jpn. J. Appl. Phys. 21 (1982) 1298-1303.

Google Scholar

[5] T. Ogawa, Giant k31 relaxor single-crystal plate and their applications, in: M. Lallart (Ed. ), Ferroelectrics - Applications, InTech, Rijeka, 2011, 3-34.

DOI: 10.5772/19117

Google Scholar

[6] M. Matsushita et al., Abstr. Am. Ceram. Soc. 103rd Annual Meet., 2001, 247.

Google Scholar

[7] T. Ogawa, Acoustic wave velocity measurement on piezoelectric ceramics, in: F. Ebrahimi (Ed. ), Piezoelectric materials and devices - Practice and applications, InTech, Rijeka, 2013, 35-55.

DOI: 10.5772/53117

Google Scholar

[8] T. Ogawa, Origin of piezoelectricity in piezoelectric ceramics from viewpoints of elastic constants measured by acoustic wave velocities, in: AP. Barranco, Ferroelectric materials - Synthesis and characterization, InTech, Rijeka, 2015, 33-58.

DOI: 10.5772/60793

Google Scholar