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Characterization of crystal lattice defects in calcium molybdate single crystals (CaMoO 4 ) by means of X‐ray diffraction topography
Author(s) -
Wierzbicka E.,
Malinowska A.,
Wieteska K.,
Wierzchowski W.,
LefeldSosnowska M.,
Świrkowicz M.,
Łukasiewicz T.,
Paulmann C.
Publication year - 2015
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.2639
Subject(s) - molybdate , diffraction , materials science , crystallography , x ray crystallography , lattice (music) , crystal structure , characterization (materials science) , x ray , calcium , crystal (programming language) , chemistry , optics , nanotechnology , metallurgy , physics , computer science , programming language , acoustics
Calcium molybdate CaMoO 4 crystals are perspective materials for many applications in acoustic‐electronics, acoustic‐optics and nonlinear optics. They are also used as laser hosts, scintillators, different kinds of substrates and active elements of ionizing radiation detectors. For all these applications large‐sized single crystals of high structural quality are required. The samples of CaMoO 4 crystals have been investigated by means of synchrotron white beam topography, monochromatic beam topography and conventional X‐ray Lang projection topography. The high‐resolution rocking curves have also been taken using synchrotron and conventional arrangements. The topographs showed a rather good crystallographic perfection of the crystals. In particular, they did not reveal any segregation fringes proving high homogeneity of the chemical composition. Relatively high densities (<10 4 cm −2 ) of weak point‐like diffraction contrasts were observed, which can be most probably interpreted as dislocation outcrops. The distinct main imperfection of the investigated crystals was variously developed block structure. The evaluation of lattice misorientation was realized by means of projection and section white beam synchrotron radiation topographs. The evaluated misorientation between various blocks was in the range of several arc minutes. Copyright © 2015 John Wiley & Sons, Ltd.