Search results

1

Valency of Yb in PbS and PbTe Determined by XPS

100%

Gołacki Z., Heinonen M.

Acta Physica Polonica A

|

1997

|

vol. 91

|

issue 4

775-778

EN

X-ray photoelectron spectroscopy experiments on PbTe:Yb, PbS:Yb, PbTe, and PbS crystals have been performed using the monochromatized Al K_{α} radiation. The valence band spectrum of PbTe:Yb exhibits one set of peaks associated with divalent Yb initial states, but two sets associated with divalent and trivalent Yb are observed for PbS:Yb. The valency of Yb in PbTe:Yb is 2 (within an accuracy of the experiment) but in PbS:Yb the mixed valency of Yb is seen. These conclusions are confirmed by an analysis of Yb 4d spectra in PbTe:Yb and PbS:Yb crystals.

2

Valency of Selected Rare-Earth Ions in SnTe Matrix

100%

Gołacki Z., Heinonen M.

Acta Physica Polonica A

|

1997

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vol. 91

|

issue 4

779-782

EN

X-ray photoelectron spectroscopy experiments on SnTe crystals doped by Sm, Eu, and Yb were performed to determine the valency of these ions in the SnTe matrix. The analysis of the X-ray photoelectron spectroscopy valence-band spectra revealed that Eu and Yb are divalent while Sm is trivalent in SnTe. These conclusions were confirmed by studies of the binding energies of core levels (4d-levels of Yb and 3d -levels of Sm and Eu), which are not presented here.

3

Study of Mo-Ni Alloys by X-Ray Spectroscopies

81%

Ławniczak-Jabłońska K., Heinonen M., Inoue J., Tohyama T.

Acta Physica Polonica A

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1993

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vol. 83

|

issue 1

115-124

EN

Band structure investigations of the random MoNi_{4} and MoNi_{3} alloys, performed by emission and photoelectron spectroscopy, is reported. The X-ray emission and X-ray photoelectron spectra allowed to study the occupied valence band states below Fermi level. These techniques gave the full description of changes in the density of valence electron states distribution due to substitution of Mo atoms into the fcc Ni lattice up to 25 at%. The analysis of the emission and photoelectron spectra led to clear distinction between the changes in spectra caused by density of states structure and by additional effects involved in creation of the particular spectra. The experimental data are compared with the density of states calculated using coherent potential approximation and linear muffin-tin orbital methods.

4

X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn_{1-x}Co_{x}S Diluted Magnetic Semiconductor Crystals

61%

Ławniczak-Jabłońska K., Gołacki Z., Paszkowicz W., Iwanowski R., Johansson L., Heinonen M.

Acta Physica Polonica A

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1993

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vol. 84

|

issue 4

633-636

EN

X-ray photoelectron spectroscopy and powder X-ray diffraction studies of diluted magnetic semiconducting alloys Zn_{1-x}Co_{x}S, in the composition range 0 ≤ x ≤ 0.18, were performed. The analysis of XPS spectra has shown that admixture of Co into ZnS lattice does not affect the shape and position of Zn 2p core level, whereas certain modification of the S 2p peak shape was observed. The detected binding energy of Co indicated similarity between Co-S and Co-O bond structure. Significant contributions of Co 3d^{7} electrons to the valence band density of states were revealed.

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4 Acta Physica Polonica A

2 1997

2 1993

4 Heinonen M.

3 Gołacki Z.

2 Ławniczak-Jabłońska K.

1 Inoue J.

1 Iwanowski R.

1 Johansson L.

1 Paszkowicz W.

1 Tohyama T.

Valency of Yb in PbS and PbTe Determined by XPS

Valency of Selected Rare-Earth Ions in SnTe Matrix

Study of Mo-Ni Alloys by X-Ray Spectroscopies

X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn_{1-x}Co_{x}S Diluted Magnetic Semiconductor Crystals