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Crystallographic Orientation Relationships Between SrTiO 3 and Ruddlesden‐Popper Phase
Author(s) -
Nien ChihHung,
Lu HongYang
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.05066.x
Subject(s) - crystallography , microstructure , materials science , phase diagram , transmission electron microscopy , phase (matter) , diffraction , phase boundary , crystal structure , x ray crystallography , lattice (music) , mineralogy , chemistry , nanotechnology , optics , physics , organic chemistry , acoustics
The crystalline phase mixture and microstructure of SrO ‐excess SrTiO 3 powder sintered at 1350°C/4 h is analyzed using X‐ray diffractometry ( XRD ), and scanning and transmission electron microscopy ( SEM and TEM ). Second phases represented by Ruddlesden–Popper Sr 3 Ti 2 O 7 ( RP 2 ) and Sr 4 Ti 3 O 10 ( RP 3 ) coexist with SrTiO 3 ( ST ), consistent with the SrO – TiO 2 phase equilibrium diagram. Some ST grains contain inter‐grown RP 2 lamellae that permits analysis of the ST ‐ RP 2 interface. The ST ‐ RP 2 boundary shared by (001) ST and (001) RP 2 , although containing a lattice mismatch, is accommodated by long‐range elastic strain. The crystallographic orientation relationships of ST and RP 2 at the interface are determined by selected area diffraction patterns ( SADP ) and described by transformation matrices. The crystallographic shear structure across the ST – RP boundary exhibiting the characteristic α‐fringe pattern can be represented by a fault vector R = 1/2(111) ST .