Characterisation of the Defect Structure in Gadolinum Orthovanadate Single Crystals Grown by the Czochralski Method

Abstract

The GdVO4 single crystals, both undoped and doped with erbium or thulium, were studied by means of X-ray diraction topographic methods exploring laboratory and synchrotron radiation sources. Variously developed block structure, caused probably by thermal stresses, was revealed. The highest crystallographic perfection was observed in the crystal doped with 4 at.% of thulium, which was free of the grain boundaries in the end part. Contrary to that, the dierences in structural perfection between samples cut out from various regions of the crystal and for dierent kinds of doping, were less distinct in other crystals. The diraction topographic methods enabled the statement that the misorientation between various blocks is in the range of several arc minutes.

Characterization of crystal lattice defects in calcium molybdate single crystals (CaMoO4) by means of X‐ray diffraction topography

“…The revealed block structure is most probably caused by cracking of the CMO crystals connected with thermal stresses introduced by nonuniform cooling. The presently observed defect structure appears to be very similar to those found in YVO 4 and GdVO 4 crystals grown by the Czochralski method …”

“…The aim of the present study was the characterization of crystal lattice defects in CaMoO 4 crystals by means of synchrotron and conventional X‐ray diffraction topography completed by recording of high‐resolution diffraction curves. These methods are very sensitive to the lattice deformation and are very effective for studying of various oxide crystals grown by Czochralski method …”

Structure and photoluminescent properties of green‐emitting terbium‐doped GdV1−xPxO4 phosphor prepared by solution combustion method

“…The GdVO 4 crystallized in a tetragonal with a zircon structure having a space group of I41/amd (No. 141) . It has four molecular units per unit cell and high symmetry .…”

Synthesis, growth, defects and laser action of Yb:Y0.71Lu0.29VO4 crystals

“…Crystal defects, such as dislocations, low-angle grain boundaries and inclusions, have been revealed in ordered crystals of Nd:YVO 4 and Nd:GdVO 4 by X-ray topography, TEM and chemical etching. [11][12][13][14] However, crystal defects in mixed rare earth orthovanadates have seldomly been investigated. In this paper, we try to shed some light on the crystal defects and laser properties of Yb:Y x Lu 1−x VO 4 crystals.…”