Synthesis of SnSb2Te4 Microplatelets by High-energy Ball Milling

In this work we demonstrate that high-energy ball milling process can be used to synthesize SnSb₂Te₄ without surfactant and further annealing. Milling parameters such as ball to raw material ratio (5:1) and milling time (2h) were determined to be suitable for synthesizing microplatelets of SnSb₂Te₄. The powders after milling for various durations were characterized by X-ray powder diffraction, scanning electron microscopy and electrical resistance measurements.

Keywords:
mechanical alloying; semiconductors; electrical properties

Authorship

Mário Sérgio da Luz ^**e-mail: daluz.mario@icte.uftm.edu.br

Universidade Federal do Triângulo Mineiro – UFTM, Rua Dr. Randolfo Borges Júnior, 1250, CEP 38066-200, Uberaba, MG, BrazilUniversidade Federal do Triângulo MineiroBrazilUberaba, MG, BrazilUniversidade Federal do Triângulo Mineiro – UFTM, Rua Dr. Randolfo Borges Júnior, 1250, CEP 38066-200, Uberaba, MG, Brazil

Fernando Pacheco Tofanello

Murilo Senhuki Esposto

Ariana de Campos

Bento Ferreira

Escola de Engenharia de Lorena, Universidade de São Paulo – USP, CP 116, CEP 12602-810, Lorena, MG, BrazilUniversidade de São PauloBrazilLorena, MG, BrazilEscola de Engenharia de Lorena, Universidade de São Paulo – USP, CP 116, CEP 12602-810, Lorena, MG, Brazil

Carlos Alberto Moreira dos Santos

*e-mail: daluz.mario@icte.uftm.edu.br

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables

Figures (5)
Tables (1)

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Figure 1
(color online) Structural evolution of the SnSb₂Te₄mixture after milling times for 0, 0.5, 2, 4 and 6h. This figure also displays (on top) the simulated diffractogram for SnSb₂Te₄ structure by PCW software¹²12 Kraus W and Nolze G. POWDER CELL - a program for the representation and manipulation of crystal structures and calculation of the resulting X-ray powder patterns. Journal of Applied Crystallography. 1996; 29(3):301-303. http://dx.doi.org/10.1107/S0021889895014920.
http://dx.doi.org/10.1107/S0021889895014... . All peaks indicated by crosses can be indexed as SnSb₂Te₄ reflections and minor peaks corresponding to SnO₂ were indicated by asterisk symbol. Sn, Sb an Te are indicated by green, red and blue narrows respectively.

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Figure 2
Variation of a lattice parameter and lattice strain of the obtained powders vs. milling times.

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Figure 3
Details of SnSb₂Te₄ powders after 4 hours of milling.

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Figure 4
(color online) EDS results of chemical composition point ⊗ in the right picture of Figure 3. The inset shows the microanalysis data of SnSb₂Te₄ microplatelets after 4 hours of milling.

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Figure 5
Resistance as a function of temperature of as-milled (6 h) and compacted powders.

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Table 1
Crystal structure parameters of SnSb₂Te₄ which crystallizes in a hexagonal cell, space group R-3m (166), with lattice parameters a = 4.2940 Å and c = 41.5480 Å⁵.

Figure 1 (color online) Structural evolution of the SnSb₂Te₄mixture after milling times for 0, 0.5, 2, 4 and 6h. This figure also displays (on top) the simulated diffractogram for SnSb₂Te₄ structure by PCW software¹²12 Kraus W and Nolze G. POWDER CELL - a program for the representation and manipulation of crystal structures and calculation of the resulting X-ray powder patterns. Journal of Applied Crystallography. 1996; 29(3):301-303. http://dx.doi.org/10.1107/S0021889895014920.
http://dx.doi.org/10.1107/S0021889895014... . All peaks indicated by crosses can be indexed as SnSb₂Te₄ reflections and minor peaks corresponding to SnO₂ were indicated by asterisk symbol. Sn, Sb an Te are indicated by green, red and blue narrows respectively.

Figure 2 Variation of a lattice parameter and lattice strain of the obtained powders vs. milling times.

Figure 3 Details of SnSb₂Te₄ powders after 4 hours of milling.

Figure 4 (color online) EDS results of chemical composition point ⊗ in the right picture of Figure 3. The inset shows the microanalysis data of SnSb₂Te₄ microplatelets after 4 hours of milling.

Figure 5 Resistance as a function of temperature of as-milled (6 h) and compacted powders.

Table 1 Crystal structure parameters of SnSb₂Te₄ which crystallizes in a hexagonal cell, space group R-3m (166), with lattice parameters a = 4.2940 Å and c = 41.5480 Å⁵.

		Parameters
Atom	Wyckoff Positions	x	y	Z
Sn (1)	3a	0.00	0.00	0.00
Sb(1)	3a	0.00	0.00	0.00
Sn (2)	6c	0.00	0.00	0.4262
Sb(2)	6c	0.00	0.00	0.4262
Te	6c	0.00	0.00	0.133
Te	6c	0.00	0.00	0.289

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Synthesis of SnSb2Te4 Microplatelets by High-energy Ball Milling

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[1] *e-mail: daluz.mario@icte.uftm.edu.br