Positive Temperature Dependence of Quadrupole Splittings in Mössbauer Spectra of Fe1.33Nb2.67Se10

2002 ◽  
Vol 57 (6-7) ◽  
pp. 627-630 ◽  
Author(s):  
Takashi Suzuki ◽  
Noriaki Okubo
Keyword(s):  
Temperature Dependence ◽  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Positive Temperature ◽  
Mossbauer Effect ◽  
Mossbauer Spectra ◽  
Positive Temperature Dependence ◽  
Low Dimensional

The Mössbauer effect in the low-dimensional compound Fe1.33Nb2.67Se10 has been examined between 78 and 414 K. An anusual positive temperature dependence of the quadrupole splittings was found above 250 K. As a possible origin a mechanism due to π bonding is suggested

Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media

2001 ◽  
Vol 89 (2) ◽  
Author(s):  
M. S. Grigoriev ◽  
A. M. Fedosseev ◽  
A.V. Gelis ◽  
N.A. Budantseva ◽  
V.P. Shilov ◽  
...  
Keyword(s):  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Mossbauer Effect ◽  
Environmental Media ◽  
Mossbauer Spectra ◽  
Effect Method

A Mössbauer effect method was used to study the formation of mixed hydroxides in the alkaline coprecipitation of Pu(IV) or Np(IV) with Fe(III). The Mössbauer spectra of mixed

Mössbauer Analyses of FeSiAl Films Sputtered in Ar or 4%N2 Mixture Atmosphere

1991 ◽  
Vol 232 ◽  
Author(s):  
K. Inoue ◽  
M. Tatsumi ◽  
T. Sakata ◽  
S. Tanabe ◽  
T. Ozeki ◽  
...  
Keyword(s):  
Hyperfine Field ◽  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Rf Sputtering ◽  
Nearest Neighbors ◽  
Unit Cell ◽  
Mossbauer Effect ◽  
Mossbauer Spectra ◽  
Disordered Structure ◽  
A Site

ABSTRACTMicrostructural differences between sendust(FeSiAl) films sputtered in pure Ar atmosphere and FeSiA1N films sputtered in Ar+4%N2 mixture atmosphere were measured using Mössbauer effect. These films were prepared by a conventional RF sputtering method. As a source for the Mössbauer measurement, 57Co was used.Before annealing, there are no differences between both films in Mössbauer spectra. The both patterns are observed as simple six-line spectra from Fe atoms in a disordered structure. After annealing, both patterns are not simple six-line spectra, which indicate there are more than two types Fe site in the crystal. A tremendous difference between both films appears in the spectra. 95% Fe atoms of FeSiAl film are at the two different sites of D03 structure. However, in FeSiAlN film, only 54& Fe atoms are at the D03 sites and about 30% Fe atoms are at different sites whose hyperfine field is about-250kOe. This value of hyperfine field is expected at a D03-like site with 5 Fe nearest neighbors. This D03-like site is explained as a site that one Fe atom is substituted for one D-site Si or Al atom in a D03 unit cell.No Fe-nitrides were observed in FeSiAlN films.

Dithiolium and diselenolium compounds of the transition metals

1969 ◽  
Vol 22 (1) ◽  
pp. 83 ◽  
Author(s):  
RL Martin ◽  
IM Stewart
Keyword(s):  
Transition Metals ◽  
Temperature Dependence ◽  
Mössbauer Spectra ◽  
Mossbauer Spectra ◽  
First Time

The preparations are reported of an extended series of compounds of the type ML2X4 where M is Mn, Fe, Co, or Ni; X is Cl or Br; and L is analytically identical with dithioacetylacetone. ��� Electronic, infrared, and Mossbauer spectra together with the temperature dependence of the magnetism (80-300�K) of these compounds establish-contrary to previous suggestions in the literature-that they should be properly formulated as tetrahalometallate salts of the 3,5- dimethyl-1,2-dithiolium cation. Simple salts of this cation (such as the iodide) have also been isolated. ��� During the course of this work salts (I- and [CoCl4]2-) of the hitherto unknown 3,5-dimethyl-1,2-diselenolium ion were synthesized and characterized for the first time.

Positive temperature dependence of time-dependent breakdown of GaN-on-Si E-mode HEMTs under positive gate stress

2019 ◽  
Vol 115 (5) ◽  
pp. 052103 ◽  
Author(s):  
F. Masin ◽  
M. Meneghini ◽  
E. Canato ◽  
C. De Santi ◽  
A. Stockman ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Time Dependent ◽  
Positive Temperature ◽  
Positive Temperature Dependence ◽  
Gan On Si
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