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Origin of Imperfections in ⟨100⟩ SrLaAlO_{4} Crystals

100%

Doerschel J., Hähnert I., Uecker R.

Acta Physica Polonica A

1997

vol. 92

issue 1

157-162

In Czochralski-grown SrLaAlO_{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 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.

Investigation of Crystal Growth of SrPrGaO_{4} and SrLaGaO_{4}

88%

Uecker R., Reiche P., Ganschow S., Uecker D.-C., Schultze D.

Acta Physica Polonica A

1997

vol. 92

issue 1

23-34

Single crystals of SrPrGaO_{4} and SrLaGaO_{4} have been grown using the Czochralski technique. Both materials melt incongruently at 1462°C and 1516°C. The non-stoichiometric crystals contain more strontium than the starting melts. Constitutional supercooling is retarded by special growth conditions and optimum melt composition. Because of their small mismatch both crystals are recommended as substrates for YBa_{2}Cu_{3}O_{7-x} epitaxy.

Growth and Investigation of Nd_{1-x}Sm_{x}ScO_3 and Sm_{1-x}Gd_{x}ScO_3 Solid-Solution Single Crystals

64%

Uecker R., Klimm D., Bertram R., Bernhagen M., Schulze-Jonack I., Brützam M., Kwasniewski A., Gesing T., Schlom D.

Acta Physica Polonica A

2013

vol. 124

issue 2

295-300

The pseudo-cubic lattice parameters of rare-earth (RE) scandate, REScO_3, single crystals grown by the Czochralski technique with RE = Dy to Pr lie between about 3.95 and 4.02 Å. These crystals are the only available perovskite substrates in this lattice constant range that can withstand virtually any thin film growth conditions. Two members of this series, PmScO_3 and EuScO_3, are, however, not suitable for substrate applications. Because the pseudo-cubic lattice parameters between neighbouring REScO_3 compounds decrease with rising atomic number of the RE in about 0.01 Å steps, the unsuitability of PmScO_3 (radioactivity) and EuScO_3 (incompatibility with Si) causes an interruption in this lattice spacing sequence. To replace them, solid solutions of their adjacent rare-earth scandates, i.e., (Nd_{0.5}Sm_{0.5})ScO_3 and (Sm_{0.5}Gd_{0.5})ScO_3, were grown by the Czochralski method. Their average pseudo-cubic lattice parameters of 3.9979 Å and 3.9784 Å are very close to those of PmScO_3 and EuScO_3, respectively, and they show very low segregation. These qualities make these solid solutions excellent substitutes for PmScO_3 and EuScO_3.

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3 Acta Physica Polonica A

1 2013

2 1997

3 Uecker R.

1 Bernhagen M.

1 Bertram R.

1 Brützam M.

1 Doerschel J.

1 Ganschow S.

1 Gesing T.

1 Hähnert I.

1 Klimm D.

1 Kwasniewski A.

1 Reiche P.

1 Schlom D.

1 Schultze D.

1 Schulze-Jonack I.

1 Uecker D.-C.

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Origin of Imperfections in ⟨100⟩ SrLaAlO_{4} Crystals

Investigation of Crystal Growth of SrPrGaO_{4} and SrLaGaO_{4}

Growth and Investigation of Nd_{1-x}Sm_{x}ScO_3 and Sm_{1-x}Gd_{x}ScO_3 Solid-Solution Single Crystals