Quantitative strain-field measurement of 1:1 B-site cation ordered domains and antiphase boundaries in Pb(Sc1/2Ta1/2)O3 ceramics by high-resolution transmission electron microscopy

TL;DR

This study uses high-resolution transmission electron microscopy to quantitatively analyze strain fields, antiphase boundaries, and dislocations in Pb(Sc1/2Ta1/2)O3 ceramics, revealing detailed strain distributions and phase shifts.

Contribution

It provides the first quantitative measurement of strain and phase shifts at B-site cation ordered domains and boundaries in this ceramic using geometric phase analysis.

Findings

Maximum in-plane strain at dislocations is 9.5%.

Lattice rotation induced by dislocations reaches 5.4 degrees.

Strain concentrates mainly inside antiphase boundaries.

Abstract

Quantitative strain measurements of the 1:1 B-site cation ordered domains, antiphase boundaries and dislocations in a highly ordered Pb(Sc1/2Ta1/2)O3 ceramic have been carried out by high-resolution transmission electron microscopy and geometric phase analysis. A phase shift of PI between two adjacent ordered domains across an antiphase boundary are determined unambiguously. The maximum in-plane strain and lattice rotation induced by a dislocation are 9.5% and 5.4deg, respectively. In a defect-free antiphase boundary, the maximum in-plane strain and lattice rotation are 1.8% and 0.9deg, respectively. The strain mainly concentrates inside the antiphase boundary.