| http://www.w3.org/ns/prov#value | - [0015] Examination of a range of PZT materials has shown the general trend that high figure of merit is associated both with high loss tangent and high relative permittivity. [0016] As already indicated, the invention is particularly suitable for apparatus in which the piezo electric material is deformed in shear mode, the apparatus having one or preferably both of the ???side shooter??? and ???ch
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