Optical, structural and magnetic characterization of Bi2-xCrxTe3 nanocrystals in oxide glass

被引：7

作者：

Araujo, C. M. ^{[1
]}

Mikhail, H. D. ^{[2
]}

Guimaraes, E., V ^{[1
]}

Rastrello, L. R. ^{[1
]}

Cano, N. F. ^{[3
]}

Silva, A. C. A. ^{[4
]}

Dantas, N. O. ^{[4
]}

Silva, R. S. ^{[1
]}

机构：

[1] Univ Fed Triangulo Mineiro, Inst Ciencias Exatas, Dept Fis, BR-38025180 Uberaba, MG, Brazil

[2] Univ Fed Triangulo Mineiro, ICTE, Dept Engn Mecan, BR-38064200 Uberaba, MG, Brazil

[3] Univ Fed Sao Paulo, Inst Mar, BR-11070100 Santos, SP, Brazil

[4] Univ Fed Alagoas, Inst Fis, Lab Novos Mat Nanoestruturados & Funcionais, BR-57072900 Maceio, Alagoas, Brazil

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 241卷

关键词：

Cr-doped; Bi2Te3; Nanocrystals; Optical properties; Magnetic properties; Structural properties; ROOM-TEMPERATURE FERROMAGNETISM; CHROMIUM TELLURIDES; ZNO; GROWTH; NANOPARTICLES; MOMENT;

D O I：

10.1016/j.matchemphys.2019.122323

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Chromium-doped bismuth telluride (Bi2-xCrxTe3) diluted magnetic semiconductor nanocrystals were successfully synthesized in a glass matrix by the fusion method with nominal Cr concentrations of x = 0.00, 0.05, and 0.10. Transmission electron microscopy confirmed the growth of nanocrystals with an average diameter of similar to 5.0nm. Shifts in X-ray diffraction peaks with increasing x indicated substitutional inclusion of Cr ions (occupying Bi sites - Cr-Bi) in the Bi2Te3 structure. The absorption spectra for x = 0.05 and 0.10 show two intense spin-allowed bands at similar to 425 and 635 nm and two minor spin-forbidden bands at similar to 650 and 685 nm. These bands were attributed to the Cr3+ d-d transitions, according to the crystal field theory. Finally, electron paramagnetic resonance spectra from the Bi2-xCrxTe3 nanocrystals displayed Cr3+ characteristics with spin 3/2 in the d(3) state, thereby confirming the trivalent state of Cr ions in the Bi2Te3 structure.

引用

页数：6

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