Inelastic slow-neutron scattering experiments are made on polycrystalline samples of intermetallic compounds PrNi, and LaNi, over the temperature range 8 to 295 K. The peaks of the inelastic magnetic-neutron-rare-earth-ion scattering resulting from the splitting of the ion ground state into a number of levels by the crystal electric field (CEF) of hexagonal symmetry are identified by temperature and angular dependence of resonance intensities and by comparing PrNi, spectra with those of LaNi,. On the basis of an effective point charge model for the CEF Hamiltonian with four variable parameters, calculations are made and CEF level scheme is restored. Magnetic contributions to the temperature dependence of heat capacity and magnetic susceptibility of PrKi, are calculated and compared with available experimental data. I m Temperaturbereich von 8 bis 295 I ( werden Untersuchungen der inelastischen Streuung langsamer Neutronen an polykristallinen Proben der intermetallischen Verbindungen PrNi, und LaNi, durchgefiihrt. Die Maxima der inelastischen Streuung magnetischer Neutronen mit lonen Seltener Erden, die aus der Aufspaltung des Grundzustands in eine Zahl von Niveaus des elektrischen Kristallfeldes (CEF) hexagonaler Symmetrie herruhren, werden durch die Temperatur-und Winkelabhangigkeit der Resonanzintensitaten und durch Vergleich der PrNi,-Spektren mit denen von LaNi, identifiziert. Auf der Grundlage eines effektiven Punktladungsmodells fur den CEF-Hamiltonoperator niit vier variablen Parametern werden Rechnungen durchgefuhrt und das CEF-Niveauschema reproduziert. Die magnetischen Beitrage zur Temperaturabhangigkeit der Warmekapazitat und magnetischen Suszeptibilitat von PrNi, werden berechnet nnd mit erhaltlichen experimentellen Werten verglichen.
The crystal field splitting of the ,H., ground multiplet of the Pr3+ ion in the intermetallic compound PrAl, is investigated by inelastic scattering of thermal neutrons. At several temperatures crystal field transitions are measured by TOF and TAS methods for polycrystalline PrAI,. I n order to decide between crystal field transitions and phonon scattering, the isostructural, nonmagnetic compound LaAI, is also measured. The crystal field parameters and the energy level scheme for the ground multiplet splitting in PrAI, are given.Die Kristallfeldaufspaltung des 3H,-Grundzustandsmultipletts von Pr3+ in der intermetallischen Verbindung PrAI, wird mittels inelastischer Streuung thermischer Neutronen untersucht. Die Kristallfeldiibergiinge in PrAI, werden bei verschiedenen Temperaturen mit Hilfe von Flugzeitund Dreiachsenspektrometer gemessen. Um zwischen Kristallfeldiibergiingen und Phononenstreuung zu unterscheiden, wird die isostrukturelle, nichtmagnetische Verbindung LaAI, ebenfalls untersucht. Die Kristallfeldparameter und das Niveauschema der Aufspaltung des Grundzustandsmultipletts in PrAI, werden angegeben.
The results are given of crystal field investigations on the cubic intermetallic compound PrMg, by inelastic neutron scattering and specific heat measurement. From the neutron spectra measured a.t T = 8 and 80 K the following crystal field parameters are obtained: B: = -34.7 ; . ' meV and 23: = -89 x meV. The crystal field ground state of Pr3+ is the non-magnetic doublet r3. COO6~aIoTCR pe3yJILTaTbI HCCJIeHOBaHIIR KPHCTaJIJII3l9eCKOI' O nOJIR B ~y6msec~oni IIHTep-MeTaJIJIM' IeCKOM CoeAlTHeHHII PrMg, MeTOAoM HeyllpyrOrO paCCeJ?HHR HefiTpOHOB I3 M3-MepeHHR yAeJIbH0fi TenJIoeMFiOCTII. ~h I J I I I H3MepeHbI CIIeKTphI HeJTIpyrO pacCeHHbIX IIOJIJ? = -34,7 X lllev II @ = -89 :": mCV. OCHOBHOe COCTORHHe Pr3+ He-MarHHTIIbIfi ny6ne~ r3. HeiiTpoHoB npii T = 8 II 80 K. HaiineIrbI cnenymwiie napaMeTpL1 KpmTaxnmecKoro 1) DDR-8051 Dresden, DDR. 2 ) DDR-7010 Leipzig, DDR.
Recently the quadrupole interaction of Cd in Cd metal was studied by Raghavan and Raghavan (1, 2) with the perturbed angular correlation method.They produced the 49 min isomer in Cdlll by the (n, r ) reaction. In our case the cadmium metal (99.999%) was bombarded in the internal beam of a cyclotron 111by 6 MeV protons for producing I n ' " .In both cases the ground state of the Cd nucleus will be reached over the 84 ns intermediate state (
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