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In the microscopic polarization-switching of SrBi 2 Ta 2 O 9 (SBT) thin films, a significant proportion of the crystallites have proved to remain unswitchable. From the Curie-rule and from hysteresis measurements of SBT material with uniform crystal orientation, it follows that SBT posseses only two polar axes. The switchable polarization of polycrystalline films with different...
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