High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

Abstract

The growth of SrLaGaO 4 and SrLaAlO4 crystals on (100) and (001) oriented seeds was investigated. Various defects, which appeared in crystals grown on these two orientations, were observed in polarized light and by X-ray diffraction topography. It was found that to obtain a substrate of the best quality, the crystal should be cut along the growth directions. Therefore, crystals pulled along (100) direction are utilized for preparation of (001) substrates, whereas (100) substrates are better to cut from crystals grown on (001) seed. The quality of the prepared substrates was determined by high resolution X-ray diffraction study in terms of rocking curve and mean mosaic angle.

Synchrotron white beam topography studies of SrLaGaO4 crystals

“…The synchrotron topographs revealed the misorientation of the crystal lattice inside the "oval" with respect to the rest of the middle region. The elongation of reciprocal space vector along ω direction suggesting the existence of misorientation component was reported in [7,9]. The present topographic studies revealed several misoriented areas.…”

“…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].…”

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].…”