Origin of Imperfections in ⟨100⟩ SrLaAlO₄Crystals

Abstract

In Czochralski-grown SrLaΑIO 4 crystals with (100) orientation, (001) planar faults extending through the entire crystal boule can frequently be observed. Chemical etching and transmission electron microscopy including energy dispersive X-ray spectroscopy were used to characterise their nucleation sites, these being located iu the upper part of the crystal cone. Three serious sources were found: (1) lateral {001) facets, (2) grown-in defects in the seed, and (3) small particles of a second phase in the interior of the cone. These particles were identifled as trígonal and cubic form of lanthanum oxide with a different Sr content.

X-ray topography of SrLaGaO4 single crystals

“…There are only a few works devoted to the problem of extended crystal lattice defects in SLG [5][6][7]. Yet, many reports on color centers, associated with oxygen-related point defects influencing the color of SLG crystals, can be found in the literature [1].…”

Synchrotron white beam topography studies of SrLaGaO4 crystals

“…There are only few papers devoted to the perfection of the SLG crystals, especially with the use of X-ray diffraction methods [7][8][9]. SrLaGaO 4 [7][8][9].…”

“…SrLaGaO 4 [7][8][9]. Dislocations propagated from the seed [8] and growth striations [9] in the SLA crystals grown in [1 0 0] direction were observed.…”

“…SrLaGaO 4 [7][8][9]. Dislocations propagated from the seed [8] and growth striations [9] in the SLA crystals grown in [1 0 0] direction were observed. Crystal lattice defects in SLG crystals grown in [0 0 1] direction in N 2 atmosphere with different O 2 contents were investigated by conventional X-ray topography in [10].…”