0000000000171867
AUTHOR
S. Pokrzywnicki
The magnetic resonance of Gd3+ in Gd2Se3 near the phase transition and up to 300 K
Temperature dependences of the width of the Gd2Sc3 ESR lines are investigated. The observed width is satisfactory explained by a dipole mechanism narrowed by exchange interaction. Changes of the Gd2Se3 ESR line at T = 6 K are due to antiferromagnetic ordering in the sample. Es wird die Temperaturabhangigkeit der ESR-Linienbreite von Gd2Se3 untersucht. Die beobachtete Breite wird durch einen Dipolmechanismus mit Verschmelzung durch Austauschwechselwirkung beschrieben. Anderungen der Gd2Se3-ESR-Linie bei T = 6 K werden infolge antiferromagnetischer Ordnung in der Probe hervorgerufen.
Magnetic Properties of DyTe
The magnetic properties of the lanthanide chalcogenides are much less explored than the monopnictides. The main reasons are probably difficulties in syntheses and the crystals growth. In particular, the properties of monotellurides are almost completely unknown. The dysprosium tellurides: DyTe and Dy2Τe3, crystallize in the structures related to the rock salt type. The first compound is metallic, while the second — semiconducting. Dysprosium sesquitelluride behaves like a simple antiferromagnet with the Neel temperature equal to 4.1 K [1]. We synthesized and investigated the dysprosium monnotelluride in order to examine a change of exchange interactions after transition to the metallic stat…
Electron paramagnetic resonance of Gd3 in TlGdSe2
Electron paramagnetic resonance has been studied on the polycrystalline sample of the layer compound TlGdSe 2 . When the temperature is lowered from room temperature the linewidth reaches a shallow minimum near 60 K and then decreases rapidly below 15 K. From the two-dimensional molecular field model two exchange constants J 1 and J 2 with the nearest and next nearest neighbors were estimated. The calculated high-temperature limit of the linewidth (341 mT) is in fair agreement with the experimental value (314 mT). It may be slightly improved after taking into account the preferred orientation of the sample.
On the pyrolytic decomposition of cadmium carbonate
The pyrolytic decomposition of cadmium carbonate was studied by thermogravimetry (TG), derivative thermogravimetry (DTG), differential thermoanalysis (DTA) and exoemission of electrons (EEE).