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1
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On the High Compositional Uniformity of Thick GaAlAs Layers Grown by Liquid Phase Electroepitaxy

100%
Żytkiewicz Z., Miotkowska S.
Acta Physica Polonica A
|
1992
|
vol. 82
|
issue 5
765-768
EN
The results of electroepitaxial growth of thick GaAlAs layers on GaAs substrates are presented. It is experimentally proven that effective convective mixing of the solution volume results in the compositional uniformity of GaAlAs layers, even in spite of the high compositional non-uniformity of the material supplying the solutes (Al, As) to the solution during the growth of the layers. For the first time this allowed us to grow uniform GaAlAs layers with thicknesses up to 200-300 μm in a wide composition range from a small (5 g) amount of solution.
2
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Solubility Limit of Ni in Cd_{1-x}Ni_{x}Te Crystals

81%
Miotkowska S., Miotkowski I., Dynowska E.
Acta Physica Polonica A
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1994
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vol. 86
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issue 5
737-739
EN
The Cd_{1-x}Ni_{x}Te crystals were grown by the Bridgman method. The investigated samples were cut from five different ingots with nominal contents of nickel varied from 0.005 to 0.05. The investigations were performed using X-ray powder diffraction method and energy dispersive and wavelength dispersive electron microprobe analysis. The samples were ałso examined in a scanning electron microscope. Examinations of wavelength dispersive electron microprobe analysis show that the actual contents of nickel differ from the nominal values. The solubility limit of nickel was determined to be x = 0.005. The precipitates of NiTe were found in samples of a greater content of nickel. Their dimensions were between 5 to 90 micrometers. X-ray powder diffraction measurements did not reveal any significant change of the lattice constant of investigated crystals in comparison with pure CdTe.
3
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Structural Properties of Cd_{1-x}Mg_{x}Te and Cd_{1-x-y}Mg_{x}Mn_{y}Te Crystals

81%
Miotkowska S., Dynowska E., Miotkowski I.
Acta Physica Polonica A
|
1994
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vol. 86
|
issue 4
605-611
EN
Electron probe microanalysis and X-ray diffraction studies have been performed on samples of ternary Cd_{1-x}Mg_{x}Te (0.05 ≤ x ≤ 0.09) and quaternary Cd_{1-x-y}Mg_{x}Mn_{y}Te (0.025 ≤ x ≤ 0.4; 0.025 ≤ y ≤ 0.7) alloys. The investigated samples were cut from 24 different ingots grown by Bridgman method. Microprobe examinations have revealed significant differences between actual and nominal content of Mg along the longitudinal direction for both ternary and quaternary ingots. In contrast to Mg, for most Cd_{1-x-y}Mg_{x}Mn_{y}Te samples the actual Mn content was within ±5% of nominal content. The lattice constants have been determined by X-ray powder diffraction method. Whereas Cd_{1-x-y}Mg_{x}Mn_{y}Te samples exhibit only zinc blende crystal structure for the entire region of x and y investigated, the Cd_{1-x}Mg_{x}Te alloy has two different structures depending on Mg content; a zinc blende structure below x = 0.5 and a wurtzite structure above it. In both alloys the lattice constant decreases with increasing Mg content.
4
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Composition Determination of Some A^{II}B^{VI} Ternary Semiconductors from Quasi-Forbidden Reflection Intensity

71%
Bąk-Misiuk J., Domagała J., Dynowska E., Miotkowska S., Paszkowicz W.
Acta Physica Polonica A
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1994
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vol. 86
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issue 4
575-578
EN
The aim of the present paper is to study the possibility of application of the X-ray quasi-forbidden reflection method to the composition determination of the sphalerite-type Cd_{1-x}M_{x}Te = Mg, Zn, Mn) single crystals. The method is based on the property of quasi-forbidden reflections that their integral intensity is very sensitive to composition and weakly sensitive to crystal lattice defects. An example of application for a Cd_{1-x}Mn_{x}Te single crystal is presented.
5
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Transport and Magnetic Properties of Pb_{1-x-y}Sn_{y}Mn_{x}Te (x ≤ 0.16)

61%
Łazarczyk P., Grodzicka E., Arciszewska M., Witkowska B., Dynowska E., Miotkowska S., Story T.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
469-472
EN
Hall constant, conductivity and magnetic susceptibility of Pb_{1-x-y}Sn_{y}Mn_{x}Te semimagnetic semiconductor were investigated as a func­tion of Mn content (x = 0.04, 0.09, 0.16, y = (0.7-0.8)) in the temperature range T = (4 - 300) K. A ferromagnetic phase transition takes place at T = 5 K for samples with x = 0.04, at T = 10 K for x = 0.09 and at T = 20 K for x = 0.16. For crystals with x ≥ 0.09 the strong temper­ature dependence of the Hall constant is observed for temperatures below 40 K. Magnetic field characteristics of the Hall effect is strongly non-linear at T = 4.2 K. No significant temperature or magnetic field dependence of con­ductivity is observed in the whole temperature range studied. The observed transport anomalies are due to the anomalous Hall effect.
6
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Solubility and Segregation of Co in CdTe-Based Ternary and Quaternary Alloys

61%
Miotkowska S., Dynowska E., Miotkowski I., Alawadhi H., Lewicki A., Metcalf P., Ramdas A.
Acta Physica Polonica A
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2002
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vol. 101
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issue 5
735-742
EN
Single crystals of Cd_{1-x}Co_xTe and Cd_{1-x-y}Co_xMn_yTe are characterized with X-ray powder diffraction and electron microprobe to establish compositional dependence of the lattice parameters and deduce Co solubility limit. The experimental compositional profiles are examined on specimens taken from various locations of ingots along their longitudinal axes and compared with normal freezing distributions. The values of Co segregation coefficient are analyzed for both ternary and quaternary alloys in terms of normal freezing mode.
7
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Precipitates in Cd_{1-x}Ni_{x}Se Crystals Grown by the Bridgman Method

61%
Kachniarz J., Dynowska E., Miotkowska S., Paszkowicz W., Miotkowski I., Ramdas A.
Acta Physica Polonica A
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1992
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vol. 82
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issue 5
725-728
EN
Single crystals of Cd_{1-x}Ni_{x}Se alloys (x ranging from 0 to 0.075) were investigated using electron microprobe and X-ray diffraction. The analysis shows the presence of Ni-Se precipitates. The solubility limit of Ni is estimated to be 0.008.
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