The knowledge about parameters of melting and crystallization processes is required for controlled growth of ternary or quaternary single crystals from the melts. The differential thermal analysis method was used for investigation of the melting and crystallization kinetic parameters of Cd1‐x‐yMnxZnyTe alloys (x = 0.05–0.25, y = 0.05, 0.10). Two different ways of sample thermal processing allow us to study the supercooling‐superheating dependencies and the volume fraction of quasi‐solid phase (clusters) depending on the melt holding temperature and time. “Negative” supercooling of Cd1‐x‐yMnxZnyTe melts was observed when superheating of the melts don't exceed 20 K after their melting start. The su‐ percooling values of Cd1‐x‐yMnxZnyTe melts decreased with increasing x (i.e. Mn content). The change of the melts holding time from 10 to 60 min has no effect on the supercooling values. Volume fraction of Cd1‐x‐yMnxZnyTe alloys clusters existing in the melt decreased with the holding temperature increasing. Full homogenization occurred only after of Cd0.95‐xMnxZn0.05Te melts superheating higher than 1385 K, below this temperature melts exist in semiliquid state. The volume fraction of the quasi‐solid phase is smaller if the melt was heated at 10 K/min than after heating at 5 K/min to the same temperature. Melting temperature of Cd0.95‐xMnxZn0.05Te alloys decreased with Mn content increasing. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Vertical Bridgman growth and characterization of Cd0.95-xMnxZn0.05Te (x=0.20, 0.30) single-crystal ingots Notice: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The publisher by accepting the manuscript for publication acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Vertical Bridgman growth and characterization of Cd 0.95-x Mn x Zn 0.05 Te (x=0.20, 0.30) single-crystal ingots

The correlation between Cd0.90-xMnxZn0.10Te (CMZT) melt state and structural properties of the crystals, grown by vertical Bridgman method, was investigated. The Cd0.9-xMnxZn0.1Te crystals with various Mn compositions (x = 0.1 and 0.2) were grown by a two-step method from high-purity elemental components. We have conducted a series of crystal growth runs with different degrees of melt superheating over the alloy's melting temperature. We obtained ingots with various crystalline structures and properties. It was concluded that the best crystals were grown from the melt with a thermal gradient of about 5 °C/cm during growth process. We have found that the band-gap increases (from 1.67 eV at x=0.1 to 1.79 eV at x=0.2) with Mn content.

We investigated melting and crystallization processes of Cd0.50Mn0.50Te. Using differential thermal analysis (DTA) we studied the solid-liquid equilibrium temperature range, the temperature dependence of the volume fraction of the solid phase in the melt, and crystallization peculiarities. We observed that changing a dwell temperature from 1346 to 1354 K results in an increase of the crystallization temperature of the Cd0.50Mn0.50Te melt. Since the melt is in a semiliquid state, its crystallization occurs over a solid-phase domain. It was found that a slightly overheated Cd0.50Mn0.50Te melt (up to 10 K) crystallizes more slowly than more overheated melts, and that the Cd0.50Mn0.50Te solid solutions are in a semi-liquid state in the temperature range of 1338-1354 K.