Origin of Imperfections in ⟨100⟩ SrLaAlO4 Crystals |
| J. Doerschela, I. Hähnertb and R. Ueckera aInstitut für Kristallzüchtung im Forschungsverbund Berlin e.V., 12489 Berlin, Germany bInstitut für Physik, Humboldt-Universität zu Berlin, 10115 Berlin, Germany |
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| In Czochralski-grown SrLaAlO4 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 in 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 identified as trigonal and cubic form of lanthanum oxide with a different Sr content. |
| DOI: 10.12693/APhysPolA.92.157 PACS numbers: 61.72.Ff, 81.65.Cf, 81.30.Mn |