Crystal Structures, Optical, and Magnetic Properties of Zn3-xMnxTeO6

doi:10.15541/jim20190606

Abstract

Abstract:

The effects of Mn ²⁺ doping on the structural, optical and magnetic properties of the corundum-related oxide Zn₃TeO₆ were investigated. Polycrystalline ceramic samples of the solid solution Zn_3-_xMn_xTeO₆ (0<x≤2.0) were prepared by a solid-state reaction route. Phase diagram as a function of Mn concentration indicates monoclinic (C2/c) structure for x<1.0, disproportionated mixing of both monoclinic (C2/c) and rhombohedral (R-3) structure for 1.0≤x≤1.6, and R-3 structure for x≥1.8. Moreover, when x=2.0, ZnMn₂TeO₆ was formed, in which the bond length of Te-O and Mn/Zn-O increased, and the Mn/ZnO₆ octahedra became more distorted. Rietveld refinements of the crystal structures from the powder X-ray diffraction (XRD) data showed that the Zn/MnO₆ octahedra were highly distorted in R-3 phase. With the increase of Mn ²⁺ doping content, the solid solution Zn_3-_xMn_xTeO₆ demonstrated not only the structure change from C2/c to R-3, but also the color evolution from light yellow to dark yellow. In optical absorption spectroscopy, with the increase of Mn ²⁺ doping concentration, the absorption at 400-550 nm was enhanced, and the optical band gap of the samples gradually decreased from 3.25 eV (x=0.1) to 2.08 eV (x=2.0). Analysis revealed that the color of samples changed from light yellow to dark yellow is due to the d-d transition of Mn ²⁺ ions in Zn/MnO₆ octahedron. Magnetic measurements indicate that the antiferromagnetic transition temperature of the solid solution gradually increased with the increase of the doping amount of Mn ²⁺, and the doped Mn ²⁺ ions exist in a high spin state.

Key words: Zn₃TeO₆-Mn₃TeO₆, crystal structure, magnetism, ultraviolet absorption spectrum

CLC Number:

TQ174

LI Shufang,ZHAO Shuang,ZHOU Xiao,LI Manrong. Crystal Structures, Optical, and Magnetic Properties of Zn_3-_xMn_xTeO₆[J]. Journal of Inorganic Materials, 2020, 35(8): 895-901.

Figures/Tables 8

Fig. 1 XRD patterns of Zn3-xMnxTeO6 (0<x≤2.0)

Fig. 2 Lattice parameters a, b and c [nm] (a), and V [nm3] (b) obtained from Zn3-xMnxTeO6 (0<x≤2.0) solid solutions by XRD measurements at room temperature

Fig. 3 Rietveld refined of the PXRD data (a) and crystal structure (b) of ZnMn2TeO6 Zn/Mn: blue spheres; Te: yellow spheres; O: red spheres; TeO6 octahedra: yellow; MnO6 octahedra: blue

Table 1 Crystallographic parameters for ZnMn2TeO6 obtained from the Rietveld refinement of the PXRD data

Atom	Site	x	y	z	B/nm²	Occ.
Mn/Zn	18f	0.0388(1)	0.2240(1)	0.2864(1)	0.00510(1)	0.667/0.333
Te1	3b	0	0	0.5	0.00710(1)	1.0
Te2	3a	0	0	0	0.00320(1)	1.0
O1	18f	0.1773(4)	0.1972(4)	0.3833(1)	0.00510(1)	1.0
O2	18f	0.2061(3)	0.0348(5)	0.1071(2)	0.00550(1)	1.0

Fig. 4 Color evolution of the Zn3-xMnxTeO6 (0<x≤2.0) compounds in daylight

Fig. 5 Optical absorption (UV/Vis) spectra of the Zn3-xMnxTeO6 (0<x≤2.0) compounds

Fig. 6 Temperature-dependent susceptibility of Zn3-xMnxTeO6 (0<x≤2.0) measured between 5-300 K under magnetic field of 7.96×104 A/m

Fig. 7 Isothermal magnetization of Zn3-xMnxTeO6 (0<x≤2.0) measured at 5 and 300 K, respectively

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Crystal Structures, Optical, and Magnetic Properties of Zn_3-_xMn_xTeO₆

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