Growth and characterization of FexMn1-xIn2Se4 (0 ≤ x ≤ 1) single crystals by G. Attolini, V. Sagredo, L. Mogollón, T. Torres, and C. Frigeri

Crystal Research and Technology

Cryst. Res. Technol. 40, 1064 (2005) - Abstract -

Growth and characterization of Fe_xMn_1-xIn₂Se₄ (0 ≤ x ≤ 1) single crystals

G. Attolini, V. Sagredo*, L. Mogollón*, T. Torres*, and C. Frigeri

Istituto IMEM-CNR, Parco Area delle Scienze 37A, 43010 Fontanini-Parma, Italia
*Universidad de Los Andes, Departamento de Fisica, Merida, Venezuela

Keywords	crystal structure, X-ray diffraction, vapour growth, magnetic materials, magneto-optics
PACS	75.50.Pp
DOI	10.1002/crat.200410487

Single crystals of Fe_xMn_1-xIn₂Se₄ with 0 ≤ x ≤ 1 were grown by chemical vapor transport technique using I₂ as transporting agent. The resulting crystals appeared as brilliant black plates. X-ray powder diffraction data could be indexed following the hexagonal structure with space group R-3m for the low Fe concentration samples, while the high concentration sample is associated to the space group P6₃mc. Both polytypes have similar parameters, however the c parameter reduces as the Fe concentration increases, therefore the number of anion slabs decreases. The characterization of the crystals was based on morphological observations and optical absorption as a function of temperature. The obtained energy gap for the samples at different Fe concentrations suggested that they behave as direct energy gap semiconductors.

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