Anharmonic thermal vibrations and the position parameter in wurtzite structures. II. Cadmium selenide

Stevenson, Andrew W.; Barnea, Z.

doi:10.1107/s0108768184002640

Cited by 37 publications

(27 citation statements)

References 13 publications

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“…The value of 1~3321 in Table 4 can also be compared with the value of []33321 for CdSe at room temperature (model III) which is 0.81 (5) x 10-2°J A -3 (Stevenson & Barnea, 1984). The refined value of r* in Table 4 would be considered small by most standards.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of a more extensive data set it is also possible to test the differences in the magnitudes* of the anharmonic parameters as predicted, for example, in model III by refining special groups of reflections [hkO reflections have structure factors which are independent of both ~313 and ~337; hkl reflections with h+2k=3m and l=2n (where m and n are integers) have structure factors which are independent of ]3332]" Such refinements will be discussed by Stevenson & Barnea (1984), for CdSe.…”

Section: Discussionmentioning

confidence: 99%

“…Fakineos, Stevenson & Barnea (1982) have suggested a method to obviate the need to make these approximations but unfortunately it relies, in part, on the refinement of a set of hkO reflections (h, k and ! being the Miller indices of a reflection), of which there are too few for this CdS data set [the method will be demonstrated for CdSe in the following article (Stevenson & Barnea, 1984)]. The values of u according to (5a) and (5b) are 0.3765 and 0.3742, respectively, both of which still underestimate u~ and u~v.…”

Section: Rh(i)/r(ii) and Rh(ii)/rh(iii) Where Rh(x)mentioning

confidence: 99%

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Anharmonic thermal vibrations and the position parameter in wurtzite structures. I. Cadmium sulphide

Stevenson¹,

Milanko²,

Barnea³

1984

Acta Crystallogr Sect B

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Intensity measurements have been carried out with an extended-face single crystal of hexagonal CdS using Mo Ka X-radiation at room temperature. The Bragg intensities were analysed by using the oneparticle potential (OPP) within the framework of Dawson's [Proc. R. Soc. London Set. A (1967), 298, [255][256][257][258][259][260][261][262][263] generalized structure-factor formulation with allowance for cubic anharmonic effects. The position parameter in the wurtzite structure which is not determined by symmetry is evaluated, and its dependence on the temperature-factor model used is demonstrated. The most reliable determination of this position parameter, with allowance for cubic anharmonicity, is 0.37715(8). The observation of significant differences between the intensities of nonsymmetry-related reflections occurring at the same Bragg angle demonstrates the possibility of measuring the anharmonicity of thermal vibrations.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Rh(i)/r(ii) and Rh(ii)/rh(iii) Where Rh(x)mentioning

confidence: 99%

See 1 more Smart Citation

Anharmonic thermal vibrations and the position parameter in wurtzite structures. I. Cadmium sulphide

Stevenson¹,

Milanko²,

Barnea³

1984

Acta Crystallogr Sect B

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“…4a). The diffraction rings correspond to the interplanar distances of 1.24, 1.84, 2.18, and 3.5 Å and correspond to the distances between (300), (112), (110), and (002) diffraction planes for CdSe doping (wurtzite-hexagonal) from standard ASTM file [28].…”

Section: Tem Analysismentioning

confidence: 99%

CdSe/ZnS-doped silicophosphate films prepared by sol–gel method

Elisa

Vasiliu

Feraru

et al. 2015

J Sol-Gel Sci Technol

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Silicate and silicophosphate films doped with CdSe/ZnS quantum dots (QDs) have been deposited on silicon substrate, by sol-gel method, spin-coating technique. A precursor solution (PS) composed of tetraethoxysilane (TEOS) and ethanol (EtOH) has been prepared in the case of silicate films (T) and in the case of silicophosphate films (TPT), the same precursors for T films and triethylphosphate were used. In each PS, dimethylformamide and CdSe/ZnS (QD) were added. Spectroscopic ellipsometry shows that absorption of TPT films in the visible (400-700 nm) decreases over 400 nm, due to dimensional quantum effect of semiconductor doping particles embedded in the silicophosphate matrix. The same manner is noticed in the case of refractive index dependency on wavelength. Raman spectra were recorded by 785 nm excitation and put in evidence specific bands for the inorganic matrix as well as a low-intensity band characteristic for CdSe doping. The morphology of the films was investigated by transmission electron microscopy revealing semiconductor doping dots with average dimension 3.3 nm and a homogeneous distribution of the doping particles in the inorganic matrix. SEM image of the cross-section of the TPT film reveals a thickness of about 500 nm. The fluorescence spectra of CdSe/ZnSdoped films exhibit an emission band at about 530 nm, provided by 350 nm excitation, whose characteristics are close to those of CdSe compound.

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“…From electron diffraction in the TEM, the plane distances (d) are found to be 1.072 Å , 1.233 Å and 2.149 Å , which match the (2 1 4), (3 0 0) and (1 1 0) planes of bulk CdSe having d values 1.0972 Å , 1.241 Å and 2.149 Å , respectively [17]. The plane distances can be measured to 1% by very careful measurements.…”

Section: Electron Diffractionmentioning

confidence: 83%

Structural and optical characterization of CdSe nanocrystallites/rare earth ions in sol–gel glasses

et al. 2007

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Anharmonic thermal vibrations and the position parameter in wurtzite structures. II. Cadmium selenide

Cited by 37 publications

References 13 publications

Anharmonic thermal vibrations and the position parameter in wurtzite structures. I. Cadmium sulphide

Anharmonic thermal vibrations and the position parameter in wurtzite structures. I. Cadmium sulphide

CdSe/ZnS-doped silicophosphate films prepared by sol–gel method

Structural and optical characterization of CdSe nanocrystallites/rare earth ions in sol–gel glasses

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