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Physical, Electrical, and Piezoelectric Properties of Hot-Forged Sr2(NbTa)2O7 Ceramics

Published online by Cambridge University Press:  15 February 2011

Paul A. Fuierer ,
Tom R. Shrout  and
Robert E. Newnham
Paul A. Fuierer
Affiliation:
Materials Research Laboratory, The Pennsylvania State Universtiy, University Park, PA 16802
Tom R. Shrout
Affiliation:
Materials Research Laboratory, The Pennsylvania State Universtiy, University Park, PA 16802
Robert E. Newnham
Affiliation:
Materials Research Laboratory, The Pennsylvania State Universtiy, University Park, PA 16802
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Abstract

Solid solution compositions of Sr2(NbxTa1−x)2O7 ceramics with Tr ranging from 450°C to 1342°C were fabricated utilizing a hot-forging technique to achieve preffered grain orientation and thus enhance poling. Translucent samples with greater than 99% theoretical density were obtained using this process. Depending on composition, the degree of orientation as determined by x-ray diffraction was found to be 75% to 95%. The thermal expansion, resistivity, and dielectric constant were shown to be very anisotropic. The direction perpendicular to the forging axis proved to be the ferroelectric “easy” direction, exhibiting hysteresis behavior. Piezoactivity in PLS polycrystals was measured for the first time. Hot-forged samples were electrically poled and the electromechanical properties determined using the five different modes of vibration. For Sr2(Nb0.5Ta0.5)2O7: N24=1504 Hz-m, s44=18.2×10-12m2/N, k24=3.0%, d24=2.6 pC/N, g24=6.3×10-3 Vm/N, and Qm=1100. This material was also shown to resist depoling when exposed to temperatures as high as 650°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 276: Symposia U/Y – Smart Materials Fabrication and Materials for Micro-Electro-Mechanical Systems , 1992 , 51
Copyright
Copyright © Materials Research Society 1992

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References

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