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1 2014

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Czochralski growth of SrLaAlO4 and SrLaGaO 4 single crystals and its implications for the crystal morphology

Pajaczkowska A., Gloubokov A., Klos A., Woensdregt C. F.

Zeszyty Historyczne Politechniki Warszawskiej

2014

z. 16

85--89

Single crystals of SrLaAlO4 (SLA) and SrLaGaO4 (SLG) have been grown from nonstoichiometric melts by the Czochralski method making use of different seed orientations, [100] (SLA, SLG), [110] (SLA) and [001] (SLG). The anisotropic properties of the crystal structure are reflected in the growth morphology of the crystals. In the case of (SLA) {101} facets appear at the crystal/melt interface and in that of [100] SLG {101} and {103} facets occur, while for [001] SLG {001} and {103} facets are present. SLA crystals are very similar to the theoretical growth forms computed according to the Hartman-Perdok theory for models with an effective charge on oxygen, qO −2|e|. However the habit of SLG crystals corresponds better to the theoretical growth forms based on an effective charge qO = −1.5|e| due to the presence of oxygen vacancies.