MSP 4P Solid solutions in MnIn2S4 - FeIn2S4 system
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BODNAR, Ivan V., VICTOROV, Ivan, LOZHKIN, D.. MSP 4P Solid solutions in MnIn2S4 - FeIn2S4 system. In: Materials Science and Condensed Matter Physics, 13-17 septembrie 2010, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2010, Editia 5, p. 74.
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Materials Science and Condensed Matter Physics
Editia 5, 2010
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 13-17 septembrie 2010

MSP 4P Solid solutions in MnIn2S4 - FeIn2S4 system


Pag. 74-74

Bodnar Ivan V.1, Victorov Ivan2, Lozhkin D.1
 
1 Belarusian State University of Informatics and Radioelectronics,
2 SSPA “Scientific and practical materials research centre of NAS of Belarus”
 
Disponibil în IBN: 15 aprilie 2021


Rezumat

The first results on solid solutions formed in MnIn2S4 - FeIn2S4 system have been presented in the given work. Crystals of MnIn2S4, FeIn2S4 ternary compounds and MnxFe1-xIn2S4 solid solutions were grown by directional crystallization of the melt (horizontal Bridgman’s method). Metal components were charged into a quartz boat, which was placed in one end of a quartz ampoule. Sulfur was placed in the opposite end of the ampoule and it was taken with some excess from the stoichiometry, what is necessary to give rise its vapor pressure over the melt ~2.0 atm. The ampoule was evacuated down to residual pressure ~ 10-3 Pa, sealed and placed into a two-zone horizontal furnace like that the boat with metallic components was in “hot” zone of the furnace and sulfur in “cold” one. Temperature of “hot” zone was set ~1400-1430 K (depending on the compound or solid solution composition). Temperature of “cold” zone was risen with the rate of ~ 100 K/h up to 680-700 K and held for 2 hours to make available a reaction between metallic components and sulfur vapor. To make available this reaction more complete the temperature of this zone was risen again with the same rate up to 950 K and a repeated exposure for 1 hour was followed then. Thereafter the directional crystallization of the melt was carried out by decreasing of temperature of “hot” zone with a rate of 3 K/h down to 1020 K and then the annealing of the crystals obtained was carried out at this temperature for 260 h. The ingots obtained after the annealing were large block ones with dimensions of separate blocks 10 х 5 х 3 mm3. The composition of the grown crystals was determined by X-ray microprobe analysis. It was established, that the content of elements in the grown crystals is in satisfactory agreement with the specified content in the starting charge. The structure and unit cell parameters of the grown crystals were established by X-ray method. The X-ray data have shown, that there reflection indexes characteristic for cubic structure of spinel on all recorded diffractograms. The resolution of the high angle lines in the X–ray diffraction patterns indicate the uniformity of the compounds and homogeneity of solid solutions grown. The unit cell parameters calculated by the least squares method from the lines with angles 2q > 600 crystals are equal: a = 10.722 ± 0.005 Å for MnIn2S4 and a = 10.612 ± 0.005 Å for FeIn2S4. Change of indicated parameters with composition х has taken place in accordance with Vegard’s law.