The Quadrupole Interaction of Cd<sup>111</sup> in Polycrystalline Magnesium Measured with PAC

Andreeff, A.; Hunger, Hans-Jörg; Unterricker, S.

doi:10.1002/pssb.2220610258

Cited by 12 publications

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References 13 publications

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“…These are extrapolated for cadmium and the cadmium-rich alloys up to the melting points, indicated by the broken vertical lines. For the lower curves the following symbols stand for: 0 CdMg, CdMg,, v Cdo.oiMgo 99, Mg -ZC 10 the values of the electric field gradient V,, have also been evaluated as shown in the figure.It may be noted from the figure that an earlier measurement[7] for 111CdCdo.olMgo.9g and ours for lWdMg give practically the same magnitude of the quadrupole coupling constant.…”

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confidence: 77%

Temperature and concentration dependence of the electric field gradient in the cadmium‐magnesium alloy system

Hoph

Witthuhn

1981

Physica Status Solidi (b)

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The quadrupole coupling constant, eQV,,/h, for ll1Cd probe nuclei in Cd,Mgl-, alloys (z = 0.0 to 1.0) is measured as a function of temperature and composition, using the time differential perturbed angular correlation technique. The observed temperature dependence of the electric field gradient (EFG), V,, can be described by a T3iz-relation for each of the compositions studied, except in the cases where phase transformations take place. From the measured concentration dependence of the EFG in the disordered h.c.p. phase of the alloy with lattice constants c and a, plots for the variation of a3(e&V,,/h) with c/a are made at different temperatures. These experimental results are discussed, using a theory of the EFG in metals, which predicts such a plot to belinear.Die Quadrupolkopplungskonstante e&V,,/h, fur lllCd-Sondenkerne in Cd,Mgl -,-Legierungen (5 = 0,O bis 1,0) wird als Funktion der Temperatur und Zusammensetzung gemessen, wobei die zeitdifferentielle Technik gestorter Winkelkorrelationen benutzt wird. Die beobachtete Temperaturabhangigkeit des elektrischen Feldgradienten (EFG) V,, la& sich durch eine T3lz-Abhangigkeit fur jede untersuchte Zusammensetzung beschreiben, ausgenommen die Fllle, wo Phaseniibergange stattfinden. Aus der gemessenen Konzentrationsabhkngigkeit des EFG in der fehlgeordneten h.d.p.-Phase der Legierung mit den Gitterkonstanten c und a werden Kurven fur die Anderung von a3(e& Vzz/h) iiber c/a bei unterschiedlichen Temperaturen aufgetragen. Die experimentellen Ergebnisse werden diskutiert, wobei eine Theorie des EFG in Metallen verwendet wird, die eine lineare Kurve vorhersagt. l )

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confidence: 77%

Temperature and concentration dependence of the electric field gradient in the cadmium‐magnesium alloy system

Hoph

Witthuhn

1981

Physica Status Solidi (b)

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The concentration dependence of the quadrupole interaction in the disordered system Mg_xCd_1−x at high temperatures

Unterricker

Hunger

Hausbrand

1975

Physica Status Solidi (b)

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Electric Quadrupole Interaction in Noncubic Metals

Witthuhn¹,

Engel²

1983

Topics in Current Physics

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With 39 FiguresThe knowledge of the charge distribution is of basic importance for the detailed understanding of the properties of a solid. In noncubic solids this charge distribution creates an electric field gradient (EFG). The quadrupole hyperfine interaction (QI) between the nuclear quadrupole moment Q and the EFG at the site of the nucleus results in an energy-splitting of the nuclear levels. The investigation of this QI in noncubic metals and alloys can be carried out by a variety of experimental techniques. The application of the perturbed angular correlation methods has been especially fruitful in this field. Its advantages, essential for QI studies in metals, are the ease with which temperature and pressure dependencies can be measured and the applicability to pure metals as well as to systems with extremely diluted impurity probe atoms. Thus, most experimental data have been obtained by this technique during the last few years.The first experiments on the EFG in metals were reported more than two decades ago [S. I-3]. The interest in this field increased drastically after the pioneering work of RAGHAVAN [S.4] who demonstrated the perturbed angular correlation technique to be extremely powerful in this field. The experimental data collected within the following years revealed two remarkable systematic trends: the first is related to the temperature dependence of the quadrupole interaction. It was discovered at Erlangen [S. S,6] that in most cases this temperature variation follows fairly accurately a simple T 3 / 2 relation. This behaviour is found in pure metals as well as in dilute binary alloys and in many cases it holds over the entire temperature range up to the melting pOint.The second important systematics is the correlation between the ionic and the electronic field gradients [S.7,8]. This empirical result was highly unexpected in terms of the conventional ansatz of the EFG based on two independent sources, one from the lattice and the other from the conduction electrons. The "universal correlation" rather implies-besides the dependence on the geometrical array of the lattice atoms -a strong relation of the electronic gradient to the nonsphericity of the probe ion cores, which is described by the Sternheimer anti shielding factor.Stimulated by these recent experimental trends emerging from the large body of available experimental data, significant progress in the theoretical approaches can be recognized. But we are still not able to predict reliable quantitative numbers

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The Quadrupole Interaction of Cd¹¹¹ in Polycrystalline Magnesium Measured with PAC

Abstract: The lattice contribution to the electric field gradient in a metal with h.c.p. structure is connected with the c/aratio by the following relation (1): 0.0065 -4.3584 ( : -1.533)]a-3.

Cited by 12 publications

References 13 publications

Temperature and concentration dependence of the electric field gradient in the cadmium‐magnesium alloy system

Temperature and concentration dependence of the electric field gradient in the cadmium‐magnesium alloy system

The concentration dependence of the quadrupole interaction in the disordered system Mg_xCd_1−x at high temperatures

Electric Quadrupole Interaction in Noncubic Metals

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The Quadrupole Interaction of Cd111 in Polycrystalline Magnesium Measured with PAC

Abstract: The lattice contribution to the electric field gradient in a metal with h.c.p. structure is connected with the c/aratio by the following relation (1): 0.0065 -4.3584 ( : -1.533)]a-3.

Cited by 12 publications

References 13 publications

Temperature and concentration dependence of the electric field gradient in the cadmium‐magnesium alloy system

Temperature and concentration dependence of the electric field gradient in the cadmium‐magnesium alloy system

The concentration dependence of the quadrupole interaction in the disordered system MgxCd1−x at high temperatures

Electric Quadrupole Interaction in Noncubic Metals

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Resources

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The Quadrupole Interaction of Cd¹¹¹ in Polycrystalline Magnesium Measured with PAC

The concentration dependence of the quadrupole interaction in the disordered system Mg_xCd_1−x at high temperatures