Stewart, M; Cain, M G (2002) The variability of piezoelectric measurements: material and measurement method contributions. NPL Report. MATC(A)100

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Abstract

The variability of piezoelectric material measurements has been investigated in order to separate the contributions from intrinsic instrumental variability, and the contribution from the variability of materials. The work has pinpointed several areas where weaknesses in the measurement methods result in high variability, and also show that good correlation between piezoelectric parameters allow simpler measurement methods to be used.
The Berlincourt method has been shown to be unreliable when testing thin discs, however when testing thicker samples there is a good correlation between this and other methods. The high field permittivity and low field permittivity correlate well, so tolerances on low field measurements would predict high field performance.
In trying to identify microstructural origins of samples that behave differently to others within a batch, no direct evidence was found to suggest that outliers originate from either differences in microstructure or crystallography. Some of the samples chosen as maximum outliers showed pin-holes, probably from electrical breakdown during poling, even though these defects would ordinarily be detrimental to piezoelectric output.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)100
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2405

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