On the basis of X‐ray, magnetic and neutron diffraction measurements the range of solubility in the CrSxTe1−x (x = 0−0.2) system has been established and the magnetic phase diagram of the system has been plotted. The decrease of magnetization at low temperature and the additional reflections in the neutron diffraction patterns are associated with the formation of noncollinear magnetic structure which is characterized by the antiferromagnetic component of the magnetic moments. This component has the orthorhombic unit cell with \documentclass{article}\pagestyle{empty}\begin{document}$ a_M = \sqrt {3a_0 } $\end{document}, bM = a0, cM = c0. The character of the exchange interactions giving rise to this magnetic structure is discussed.
Thin films of tin(II) iodide were prepared and characterized. The lattice structure of thin films determined by X-ray diffraction is different from that of bulk SnI 2 . This change of lattice is explained by a polymorphous transition of monoclinic a-SnI 2 to hexagonal b-SnI 2 . The unit cell parameters of b-SnI 2 are a ¼ (4.506 AE 0.014) A, c ¼ (6.946 AE 0.011) A. Thin films of b-SnI 2 have predominant [001] orientation.
The anion substituted solid solutions of the MnSe 1 -x Te x system have been synthesized. The crys tal structure and magnetic properties of the synthesized solid solutions have been investigated. It has been shown that, in the concentration range 0 ≤ x ≤ 0.4, the solid solutions have a face centered cubic structure. It has been revealed that an increase in the concentration of the substituting element in the MnSe 1 -x Te x system leads to an increase in the coefficient of thermal expansion of the sample. The investigation of the magnetic properties has been carried out at temperatures in the range 80 K < T < 1000 K in a magnetic field up to 8.6 kOe. It has been experimentally found that the type of antiferromagnetic order (the second type of order ing) remains unchanged over the entire concentration range up to x = 0.4 and that the paramagnetic Curie temperature and the Néel temperature decrease within the limits of 20%. Theoretical calculations have been performed using the Monte Carlo method, and the model of nanoclusters with an uncompensated antiferro magnetic moment has been proposed.
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