Absorption spectra of Co2+ in AgInS2 orthorhombic single crystals

2001 ◽  
Vol 16 (4) ◽  
pp. 975-978 ◽  
Author(s):  
Hidong Kim ◽  
Seok-Joo Lee ◽  
Jae-Eun Kim ◽  
Hae Yong Park ◽  
Seok-Kyun Oh ◽  
...  
Keyword(s):  
Single Crystals ◽  
Absorption Spectra ◽  
Chemical Transport ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Chemical Transport Reaction ◽  
Transport Reaction ◽  
Electronegativity Difference ◽  
Crystal Field Parameters ◽  
The Ideal

The optical absorption spectra of AgInS2:Co2+ single crystals grown by chemical transport reaction using iodine as a transporting medium have been studied at 6 K. The peaks can be explained by the transitions of Co2+ in the Td symmetry with the spin-orbit coupling, which means that the deviations of the atomic sites from those of the ideal wurtzite structure can be considered negligibly small. The consideration of both the crystal field parameters and the electronegativity difference between atoms may indicate that Co atoms substitute In atoms.

Optical absorption of Co2+ in MgIn2S4, CdIn2S4, and HgIn2S4 spinel crystals

2003 ◽  
Vol 18 (3) ◽  
pp. 733-736 ◽  
Author(s):  
Seok-Joo Lee ◽  
Jae-Eun Kim ◽  
Hae Yong Park
Keyword(s):  
Optical Absorption ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Chemical Transport ◽  
Optical Absorption Spectra ◽  
Chemical Transport Reaction ◽  
Transport Reaction

The optical absorption spectra of cobalt-doped MgIn2S4, CdIn2S4, and HgIn2S4 single crystals grown by a chemical transport reaction were investigated at 7 K. The values of Dq and B calculated from the observed spectra show that the d electrons are more delocalized in the order of MgIn2S4, CdIn2S4, and HgIn2S4. Because this order corresponds to the decreasing order of the electronegativity differences between the metal and sulfur atoms of the host crystals, we conclude that as the metal-sulfur bonds in the host crystals are more covalent, the d electrons of the cobalt impurities are more spread out and the cobalt-sulfur bonds are also more covalent.

On the preparation of Fe7Se8 single crystals by a chemical transport reaction

1974 ◽  
Vol 9 (9) ◽  
pp. 1267-1272 ◽  
Author(s):  
A. Paja̧czkowska ◽  
P. Peshev ◽  
M. Ivanova ◽  
R. Gałazka
Keyword(s):  
Single Crystals ◽  
Chemical Transport ◽  
Chemical Transport Reaction ◽  
Transport Reaction

On the preparation of Cr2O3 single crystals by a chemical transport reaction

1973 ◽  
Vol 8 (9) ◽  
pp. 1011-1020 ◽  
Author(s):  
P. Peshev ◽  
G. Bliznakov ◽  
G. Gyurov ◽  
M. Ivanova
Keyword(s):  
Single Crystals ◽  
Chemical Transport ◽  
Chemical Transport Reaction ◽  
Transport Reaction

scholarly journals X-ray diffraction and theoretical study of the transition 2H-3R polytypes in Nb1+xSe2 (0 < x < 0.1)

2021 ◽  
Vol 3 ◽  
pp. e2
Author(s):  
Mohamed Sidoumou ◽  
Soumia Merazka ◽  
Adrian Gómez-Herrero ◽  
Mohammed Kars ◽  
Roisnel Thierry
Keyword(s):  
Single Crystals ◽  
Theoretical Study ◽  
Stoichiometric Composition ◽  
Chemical Transport ◽  
X Ray Diffraction ◽  
Chemical Transport Reaction ◽  
Transport Reaction ◽  
X Ray ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

Single crystals of 2H and 3R niobium diselenide were grown by a chemical transport reaction. The current determinations by single crystals X-ray diffraction reveal a non-stoichiometric composition. The structures are built from Se—Nb—Se slabs with Nb in trigonal prismatic coordination whereas the extra or additional Nb atoms are located in the octahedral holes between the slabs giving rise to the formula 2H and 3R-Nb1+xSe2 with 0.07 < x < 0.118. In particular, vacancy and Nb-Nb interactions may play an important role on the non-stoichiometry and the stacking mode in NbSe2. By increasing the number of additional Nb atoms in the pure 2H-NbSe2, a transition 2H to 3R polytype should occur in order to minimize the Nblayer—Nbextra—Nblayer repulsions between these adjacent slabs. The theoretical study shows that both 2H and 3R-Nb1+xSe2 are thermodynamically stable in the range 0 < x < 0.1.

scholarly journals Cd4As2Br3

2014 ◽  
Vol 70 (3) ◽  
pp. i15-i15 ◽  
Author(s):  
Mohammed Kars ◽  
Thierry Roisnel ◽  
Vincent Dorcet ◽  
Allaoua Rebbah ◽  
L. Carlos Otero-Diáz
Keyword(s):  
Single Crystals ◽  
General Formula ◽  
Three Dimensional ◽  
Chemical Transport ◽  
Site Symmetry ◽  
Chemical Transport Reaction ◽  
Transport Reaction ◽  
Special Position

Single crystals of Cd4As2Br3(tetracadmium biarsenide tribromide) were grown by a chemical transport reaction. The structure is isotypic with the members of the cadmium and mercury pnictidohalides family with general formulaM4A2X3(M= Cd, Hg;A= P, As, Sb;X= Cl, Br, I) and contains two independent As atoms on special positions with site symmetry -3 and two independent Cd atoms, of which one is on a special position with site symmetry -3. The Cd4As2Br3structure consists of AsCd4tetrahedra sharing vertices with isolated As2Cd6octahedra that contain As–As dumbbells in the centre of the octahedron. The Br atoms are located in the voids of this three-dimensional arrangement and bridge the different polyhedra through Cd...Br contacts.

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