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K. Krien J. C. Soares A. G. Bibiloni R. Vianden A. Hanser 《Zeitschrift für Physik A Hadrons and Nuclei》1974,266(3):195-199
The100Pd radioactivity was implanted into a pure Zn host with the help of an isotope separator. The temperature dependence of the quadrupole interaction was studied by time-differential measurements of the 84 keVγ- 75 keVK-conversion angular correlation. We conclude that electrons contribute significantly to the electric field gradient at the Rh site, but that local effects due to the 4d electrons of Rh are probably small. 相似文献
3.
Magnetization and high field Mössbauer experiments were performed to study the ground state and the metamagnetic transition in Ce(Fe, Al)2. A model is proposed for the arrangement of the Fe-moments which includes the reported finite Ce-moment. 相似文献
4.
L. A. Mendoza-Zélis A. G. Bibiloni M. C. Caracoche A. R. Lopéz-García J. A. Martínez R. C. Mercader A. F. Pasquevich 《Hyperfine Interactions》1977,3(1):315-320
The electric field gradient EFG in hafnium pyrovanadate has been measured at Hf sites at different temperatures with the time-differential perturbed angular correlation method. The results obtained show the existence of a phase transition around 110°C. 相似文献
5.
K. Krien J. C. Soares K. Freitag R. Vianden A. G. Bibiloni 《Hyperfine Interactions》1975,1(1):217-225
The electric quadrupole coupling constants of the lowest excited 5/2? state in197Hg have been measured by the e?-γ TDPAC method for the hosts Ti and Sn at room temperature and for Zn and Cd at various temperatures. The observed temperature dependences are approximately the same as those known for other impurities in the same host lattices. They are well described by a simpleT 3/2 relation. 相似文献
6.
What do the three names in the title have in common? The purpose of this paper is to relate them in a new and, hopefully, interesting way. Starting with the Fibonacci numeration system — also known as Zeckendorff's system — we will pose ourselves the problem of extending it in a natural way to represent all real numbers in (0,1). We will see that this natural extension leads to what is known as the ?-system restricted to the unit interval. The resulting complete system of numeration replicates the uniqueness of the binary system which, in our opinion, is responsible for the possibility of defining the Van der Corput sequence in (0,1), a very special sequence which besides being uniformly distributed has one of the lowest discrepancy, a measure of the goodness of the uniformity.Lastly, combining the Fibonacci system and the binary in a very special way we will obtain a singular function, more specifically, the inverse of one of the family of Riesz-Nágy. 相似文献
7.
R. C. Mercader F. H. Sánchez L. A. Mendoza-Zélis L. Terminiello A. G. Bibiloni C. P. Massolo J. Desimoni A. R. López-García 《Hyperfine Interactions》1985,23(2):211-220
The hyperfine interactions at In and Sn sites of In2O3Sn (ITO) were measured through time-differential perturbed angular correlations and Mössbauer spectroscopy, respectively. Polycrystalline samples prepared by co-precipitation with nominal 0.025, 1 and 5 at.% Sn were studied. They all showed the cubic bixbyite structure characteristic of In2O3 after annealings at 200 °C. The quadrupole interaction at In sites appears nearly independent of Sn concentration being the main result of the presence of Sn in the lattice, the gradual disappearence of the dynamic perturbation caused by after-effects. The Mössbauer data demonstrate that Sn ions are in a 4+ state with Q=0.606 mm/s and=0.226 mm/s relative to SnO3Ca at room temperature. 相似文献
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The quadrupole interaction frequency |v q| = |eQV zz /h|0 = 8.71 ± 0.11 MHz was measured for the 75 keV state of100Rh in a polycrystalline cadmium matrix by use of the γ-e? and γ-γ time differential perturbed angular correlation (TDPAC) techniques. The temperature dependence of the electric quadrupole coupling constant for100Rh in Cd is similar to those of other impurities in Cd metal. 相似文献
9.
J. Desimoni A. G. Bibiloni L. A. Mendoza-Zélis L. C. Damonte F. H. Sánchez A. López-García 《Hyperfine Interactions》1987,34(1-4):271-275
We present here preliminary TDPAC results on the semiconductors SnO2 and Cu2O in the temperature range 17–1200K, using111Cd. We discuss the presence of a time-dependent interaction associated to EC aftereffects processes in terms of the specific character (acceptor/donnor) of the impurity. 相似文献
10.
M. S. Moreno J. Desimoni F. G. Requejo M. Rentería A. G. Bibiloni K. Freitag 《Hyperfine Interactions》1991,62(4):353-358
In connection with a general study of the evolution of tin-oxygen thin films, we report here on the hyperfine interactions
of181Ta substitutionally replacting tin in the isolated phases SnO and SnO2. For this purpose, pure SnO pressed powder and a thin SnO2 film were implanted with181Hf. In both cases, unique quadrupole frequencies were found after thermal annealing treatments. The results indicate that
the following hyperfine parameters: υ
Q
= 740.6(2.1) MHz, η=0.07(2) and υ
Q
= 971.5(1.9) MHz, η=0.72(1) characterize181Ta in SnO and SnO2, respectively. 相似文献