Crystal radius and valence state of uranium in U3Se4

Valence state analyses of Fe and Mn in oxides by EPMA have been reported in literature. In this paper, the effects of valence state on intensity ratios ILα/IKα and ILα/ILβ of Cu, Ni, Co, Fe, Mn, Cr and their oxides, and on intensity ratios ILβ2/ILα1 and ILγ1/ILα1 of Mo, Nb, Zr and their oxides were studied. It was observed that intensity ratios change with valence states in accordance with some regularities, and these effects could be utilized for analyzing the valence states of catalysts.Valence state analysis of elements by EPMA is based on the fact that changes in the states of valence electrons in the outer shells of an atom cause corresponding changes in line intensities. The M electrons of Cu, Ni, Co, Fe, Mn, Cr and the N electrons of Mo, Nb, Zr are valence electrons. Line Kα1,2 and six lines of L are produced from the transitions of K-L2,3 and L-M or L-N respectively.

Download Full-text

Theory for the mixed-valence state

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19795133 ◽

1979 ◽

Vol 40 (C5) ◽

pp. C5-374-C5-374 ◽

Cited By ~ 1

Author(s):

C. M. Varma

Keyword(s):

Valence State ◽

Mixed Valence ◽

Mixed Valence State

Download Full-text

MIXED VALENCE STATE OF Sm ON THE SURFACE OF AMORPHOUS La80-xSmxAu20 ALLOYS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19808198 ◽

1980 ◽

Vol 41 (C8) ◽

pp. C8-799-C8-802 ◽

Cited By ~ 4

Author(s):

G. Krill ◽

A. Amamou ◽

A. Berrada ◽

J. Durand ◽

N. Hassanain

Keyword(s):

Valence State ◽

Mixed Valence ◽

Mixed Valence State

Download Full-text

Tc-99m Labeled Complexes of Aldehydes and Glutamate as Cholescintigraphic Agents

Nuklearmedizin ◽

10.1055/s-0038-1624914 ◽

1975 ◽

Vol 14 (04) ◽

pp. 330-338

Author(s):

L. G. Colombetti ◽

J. S. Arnold ◽

W. E. Barnes

Keyword(s):

Nuclear Medicine ◽

Gall Bladder ◽

Rose Bengal ◽

Valence State ◽

Monosodium Glutamate ◽

Kinetic Studies ◽

Scintillation Camera ◽

Blood Clearance ◽

Lower Valence ◽

Wire Basket

SummaryTc-99m pyridoxylidene glutamate has proven to be an excellent biliary scanning agent, far superior in many respect to the commonly used 1-131 rose bengal. The preparation of the compound as previously reported by Baker et al is too time consuming and requires the use of an autoclave which is not available in most nuclear medicine departments. In our facility, we have been preparing similar compounds using several aldehydes and monosodium glutamate to make labeled complexes having the same pharmacological characteristics. The mixture of monosodium glutamate, aldehyde, and Tc-99m pertechnetate is made slightly alkaline, purged with helium, and placed in a sealed vial. The vial, which is protected by a wire basket, is then heated in a laboratory oven at 130° C for a period of 15 to 20 minutes. During this time, the technetium is reduced to a lower valence state and bound to the complex formed. Chromatographic data show that these compounds are chemically similar to that previously reported. The compounds prepared concentrate in the gall bladder of the rabbit in less than 10 minutes. Kinetic studies have been performed on dogs with a scintillation camera and small digital computer to measure rates of blood clearance, liver and gall bladder uptake, and excretion into the intestine. The aldehyde — glutamate complex promises to be a useful scanning agent for the diagnosis of biliary and hepatocellular diseases.

Download Full-text

Valence state and magnetism of Mn-doped PbPdO 2 nanograin film synthesized by sol-gel spin-coating method

Thin Solid Films ◽

10.1016/j.tsf.2016.12.043 ◽

2017 ◽

Vol 623 ◽

pp. 14-18 ◽

Cited By ~ 6

Author(s):

Fenglin Tang ◽

Chao Mei ◽

Peiyu Chuang ◽

Tingting Song ◽

Hailin Su ◽

...

Keyword(s):

Spin Coating ◽

Valence State ◽

Sol Gel ◽

Spin Coating Method ◽

Coating Method ◽

Mn Doped

Download Full-text

High-valence-state Ni–Fe bimetallic phosphonate nanoribbons catalyst for enhanced photocatalytic and electrocatalytic oxygen production

Journal of Materials Science ◽

10.1007/s10853-020-05756-3 ◽

2021 ◽

Author(s):

Weinan Xing ◽

Tingting Zhang ◽

Taihua Li ◽

Jiangang Han ◽

Guangyu Wu

Keyword(s):

Valence State ◽

Oxygen Production ◽

High Valence State

Download Full-text

Influence of Fe doping on the Yb valence state and the magnetic structures in HoFe6Sn6-type YbMn6−yFeySn6 alloys (y ≤ 1.00)

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.160091 ◽

2021 ◽

Vol 875 ◽

pp. 160091

Author(s):

A. Magnette ◽

L. Eichenberger ◽

L.V.B. Diop ◽

G. Venturini ◽

L. Nataf ◽

...

Keyword(s):

Valence State ◽

Fe Doping ◽

Magnetic Structures

Download Full-text

Negative thermal expansion in YbMn2Ge2 induced by the dual effect of magnetism and valence transition

npj Quantum Materials ◽

10.1038/s41535-021-00348-z ◽

2021 ◽

Vol 6 (1) ◽

Author(s):

Yongqiang Qiao ◽

Yuzhu Song ◽

Andrea Sanson ◽

Longlong Fan ◽

Qiang Sun ◽

...

Keyword(s):

Thermal Expansion ◽

Intermetallic Compound ◽

Cell Volume ◽

Valence State ◽

Unit Cell Volume ◽

Negative Thermal Expansion ◽

Combined Effect ◽

Dual Effect ◽

Valence Transition ◽

Magnetovolume Effect

AbstractNegative thermal expansion (NTE) is an intriguing property, which is generally triggered by a single NTE mechanism. In this work, an enhanced NTE (αv = −32.9 × 10−6 K−1, ΔT = 175 K) is achieved in YbMn2Ge2 intermetallic compound to be caused by a dual effect of magnetism and valence transition. In YbMn2Ge2, the Mn sublattice that forms the antiferromagnetic structure induces the magnetovolume effect, which contributes to the NTE below the Néel temperature (525 K). Concomitantly, the valence state of Yb increases from 2.40 to 2.82 in the temperature range of 300–700 K, which simultaneously causes the contraction of the unit cell volume due to smaller volume of Yb3+ than that of Yb2+. As a result, such combined effect gives rise to an enhanced NTE. The present study not only sheds light on the peculiar NTE mechanism of YbMn2Ge2, but also indicates the dual effect as a possible promising method to produce enhanced NTE materials.

Download Full-text