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1

Defects in Detwinned LaGaO_{3} Substrates

100%

Mazur K., Fink-Finowicki J., Berkowski M., Schell N.

Acta Physica Polonica A

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1997

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vol. 92

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issue 1

205-208

EN

Single crystals of lanthanum gallate would be the suitable substrate for YBaCuO films except for the phase transition and the tendency to twinning existing in this material. However, by appropriate choice of growth conditions in the Czochralski method, it is possible to grow single crystal of LaGaO_{3} with low density of twin boundaries. Special stress and temperature treatment can then be applied to such materials to remove majority of existing twins. The substrates were examined by X-ray topography before and after detwinning and the surface was scanned with a profilometer.

2

X-Ray Diffraction Investigations of NdGaO_{3} Single Crystal

88%

Mazur K., Sass J., Giersz W., Reiche P., Schell N.

Acta Physica Polonica A

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1997

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vol. 92

|

issue 1

226-230

EN

Neodymium gallium perovskite single crystals grown with the Czochralski method were examined with several complementary X-ray methods. By means of X-ray diffraction topography and reciprocal space diagram the structural perfection and crystal homogeneity of the studied wafers were determined. Additionally, the results of the X-ray reflectometry investigations of the surface perfection after the mechanochemical treatment are presented.

3

In Situ Investigation of Microstructure Evolution during Solidification of Mg10CaxGd (x=5, 10, 20) Alloys

76%

Mendis C., Tolnai D., Stark A., Schell N., Kainer K., Hort N.

Acta Physica Polonica A

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2015

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vol. 128

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issue 4

606-610

EN

Mg-Ca-Gd based alloys are investigated as a potential alloy for degradable biomaterials with some promising results. In this investigation the Mg10CaxGd (x=5, 10, 20) were investigated with synchrotron radiation X-ray diffraction during solidification to follow the phase evolution at two different cooling rates at 5 and 50 K min^{-1}. All three alloys show formation of α -Mg followed by Mg₂Ca phase, while only Mg10Ca20Gd alloy contained Mg₅Gd phase during solidification. During cooling α -Mg was first observed between 628 and 632°C at a cooling rate of 5 K min^{-1} while this decreased to 620-628°C with the increase in cooling rate to 50 K min^{-1}. The change in cooling rate from 5 to 50 K min^{-1} did not change the types of intermetallic phases observed but resulted in suppressing temperatures at which the intermetallic phases were first detected.

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3 Acta Physica Polonica A

1 2015

2 1997

3 Schell N.

2 Mazur K.

1 Berkowski M.

1 Fink-Finowicki J.

1 Giersz W.

1 Hort N.

1 Kainer K.

1 Mendis C.

1 Reiche P.

1 Sass J.

1 Stark A.

1 Tolnai D.

Defects in Detwinned LaGaO_{3} Substrates

X-Ray Diffraction Investigations of NdGaO_{3} Single Crystal

In Situ Investigation of Microstructure Evolution during Solidification of Mg10CaxGd (x=5, 10, 20) Alloys