Comparative study of the electronic structure of hexacarbonyls and tetra-oxo-anions of 3d and 4d transition metals from the x-ray spectra

1983 ◽  
Vol 23 (5) ◽  
pp. 697-701
Author(s):  
E. A. Kravtsova
Keyword(s):  
Electronic Structure ◽  
Transition Metals ◽  
Comparative Study ◽  
X Ray ◽  
Oxo Anions

scholarly journals Comparative study of layered tetravalent metal phosphates containing various first-row divalent metals. Synthesis, crystalline structure

2007 ◽  
Vol 5 (2) ◽  
pp. 516-535 ◽  
Author(s):  
László Szirtes ◽  
László Riess ◽  
János Megyeri ◽  
Ernõ Kuzmann
Keyword(s):  
Ion Exchange ◽  
Transition Metal ◽  
Transition Metals ◽  
Comparative Study ◽  
Powder Diffraction ◽  
Layered Structure ◽  
Exchange Method ◽  
X Ray ◽  
Metal Phosphates ◽  
Ion Exchange Method

AbstractThe transition metal forms of α-zirconium-. titanium-, and hafnium phosphates were prepared by ion exchange method. Their structure was investigated by X-ray powder diffraction (XRPD) method. It was found that the transition metal containing phosphates have the same layered structure as the pristine tetravalent metal phosphates, except for the increase of interlayer distance from 7.6 Å to ∼9.5 Å. As a result of the incorporation of transition metals in the layers, the c-axis is increased from ∼15 Å to ∼20 Å (in the case of titanium phosphate to ∼25 Å). All other parameters (a, b and β °) are practically unchanged.

The thermopower of Nd1+xBa2−xCu3Oy in a comparative study of effects of Ba-site doping versus chain-Cu-site doping

1997 ◽  
Vol 12 (11) ◽  
pp. 2907-2912
Author(s):  
B. Fisher ◽  
J. Genossar ◽  
L. Patlagan ◽  
G. M. Reisner ◽  
A. Knizhnik
Keyword(s):  
Electronic Structure ◽  
Comparative Study ◽  
Temperature Dependence ◽  
Thermoelectric Power ◽  
Iodometric Titration ◽  
X Ray Diffraction ◽  
Lanthanide Ion ◽  
X Ray ◽  
Ceramic Samples ◽  
Nonmetal Transition

We report the results of measurements of resistivity up to 300 K and of thermoelectric power up to 400 K on ceramic samples of Nd1+xBa2−xCu3Oy with 0 ≤ x ≤ 0.65. The samples were fully oxygenated; they were characterized by x-ray diffraction and iodometric titration. The results are compared with data from literature reporting on effects of substitutions on the Ba site in 1–2–3 compounds and with our earlier experiments on substitution of Co for chain Cu. The focus is on the metal-nonmetal transition and on the nonmetallic regime in all these systems. Tc and the temperature dependence of S close to the metal-nonmetal transition and in the nonmetallic state seem to be determined by a single parameter, irrespective of the nature of the dopant. This result and its implications on the electronic structure of Rba2Cu3Oy (R = Y, or lanthanide ion) will be discussed.

Peculiarities of the 35Cl and 79Br NQR Spectra of Chalcogenhalide Complexes of Some Transition Metals

1997 ◽  
Vol 52 (6-7) ◽  
pp. 517-520 ◽  
Author(s):  
Z.A. Fokina ◽  
V.L. Kolesnichenko ◽  
V.l. Pekhnyo ◽  
S.V. Volkov
Keyword(s):  
Electronic Structure ◽  
Transition Metals ◽  
Structure Analysis ◽  
Metal Atom ◽  
Low Frequency ◽  
Coordination Polyhedra ◽  
X Ray ◽  
Dimeric Structure ◽  
Structure Of Metal ◽  
79Br Nqr

Abstract The peculiarities of the 35Cl, 79Br NQR spectra of the chalcogenhalide complexes are explained in terms of intraspheric effect of ligands, formation of secondary intra-and intermolecular bonds, and electronic structure of metal atom. In the 35Cl spectra of [TeCl3 ]2[OsCl6 ] 1, [SeCl3]2[OsCl6]2 and [TeCl3]2 [ReCl6 ]3 the 7-10% increase in frequency in the low-frequency multiplet are accounted for by the disturbance of the pHal-dM π-interaction due to the formation of the peripheral coordination polyhedra [SeCl6 ] and [TeCl6 ]. The peculiarities of the 35 Cl and 79 Br spectra of [MoS2 Cl3 (SeCl2)]2 4, [MoS2 Br3 (SeCl2)]2 5, [WS2Cl3 (SeCl2)]2 6 and [WS2 Br3 (SeBr 2)] 2 7 are attributed to the disturbance of the pHal-dM π-interaction under the influence of the coordination of the SeCl2 and SeBr2 ligands and formation of secondary intramolecular bonds. For [RhCl3 (SeCl2)2]2 8, [IrCl3 (SeCl2)2]2 9 and [SCl3 ][IrCl4 (SCl2)2]10, the appearance of frequencies at 25 MHz in low-frequency triplets is attributed to the intraspheric effect of weak donors-neutral SCl2 and SeCl2 molecules; the frequencies at 18 MHz are assigned to bridging chlorine atoms. This assignment was confirmed by the dimeric structure, which was established by an X-ray structure analysis.

Electronic Structure and Soft X-Ray Emission Spectra of 5d Transition Metals

1982 ◽  
Vol 111 (1) ◽  
pp. 11-52 ◽  
Author(s):  
V. V. Nemoshkalenno ◽  
V. N. Antonov ◽  
Vl. N. Antonov ◽  
W. John ◽  
H. Wonn ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Transition Metals ◽  
Emission Spectra ◽  
X Ray

X-ray appearance potential spectra and electronic structure of transition metals

1981 ◽  
Vol 24 (2) ◽  
pp. 237-241 ◽  
Author(s):  
Yu.M. Yarmoshenko ◽  
M.P. Bytzman ◽  
V.E. Dolgikh ◽  
E.Z. Kurmaev ◽  
E.V. Kuznetzov
Keyword(s):  
Electronic Structure ◽  
Transition Metals ◽  
X Ray ◽  
Appearance Potential
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