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Influence of microstructure on symmetry determination of piezoceramics
Author(s) -
Hinterstein M.,
Mgbemere H. E.,
Hoelzel M.,
Rheinheimer W.,
Adabifiroozjaei E.,
Koshy P.,
Sorrell C. C.,
Hoffman M.
Publication year - 2018
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576718003916
Subject(s) - orthorhombic crystal system , neutron diffraction , monoclinic crystal system , microanalysis , diffraction , electron diffraction , crystallography , phase (matter) , scanning electron microscope , electron backscatter diffraction , materials science , resolution (logic) , chemistry , microstructure , analytical chemistry (journal) , optics , crystal structure , physics , organic chemistry , chromatography , composite material , artificial intelligence , computer science
The origin of the complex reflection splitting in potassium sodium niobate doped with lithium and manganese was investigated using temperature‐dependent high‐resolution X‐ray and neutron diffraction as well as electron probe microanalysis and scanning electron microscopy. Two structural models were developed from the diffraction data. A single‐phase monoclinic Pm model is known from the literature and is able to reproduce the diffraction patterns perfectly. However, a model with phase coexistence of two classical orthorhombic Amm 2 phases can also reproduce the diffraction data with equal accuracy. Scanning electron microscopy in combination with electron probe microanalysis revealed segregation of the A ‐site substituents potassium and sodium. This favours the model with phase coexistence and confirms the need for comprehensive analyses with complementary methods to cover a broad range of length scales as well as to assess both average and local structure.