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

共 39 条

[21] Doped nanocrystals [J].

Norris, David J. ;

Efros, Alexander L. ;

Erwin, Steven C. .

SCIENCE, 2008, 319 (5871) :1776-1779

[22] Structural, optical, and magnetic properties of Ni doped ZnO nanoparticles: Correlation of magnetic moment with defect density [J].

Pal, Bappaditya ;

Sarkar, D. ;

Giri, P. K. .

APPLIED SURFACE SCIENCE, 2015, 356 :804-811

[23] Evolution of room temperature ferromagnetism with increasing 1D growth in Ni-doped ZnO nanostructures [J].

Pal, Bappaditya ;

Dhara, Soumen ;

Giri, P. K. ;

Sarkar, D. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2015, 647 :558-565

[24] Room temperature ferromagnetism with high magnetic moment and optical properties of Co doped ZnO nanorods synthesized by a solvothermal route [J].

Pal, Bappaditya ;

Dhara, Soumen ;

Giri, P. K. ;

Sarkar, D. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2014, 615 :378-385

[25]

Powell R.C., 1998, Physics of Solid-State Laser Materials Vol. 1 of Atomic, Molecular, V1

[26]

Powell RC, 2010, LECT NOTES PHYS, V824, P1, DOI 10.1007/978-1-4419-7598-0

[27]

Rasband W. S., 1997, "ImageJ."

[28] Dynamically stabilized bright solitons in a two-dimensional Bose-Einstein condensate [J].

Saito, H ;

Ueda, M .

PHYSICAL REVIEW LETTERS, 2003, 90 (04) :4

[29] Weak ferromagnetism in Mn2+ doped Bi2Te3 nanocrystals grown in glass matrix [J].

Silva, R. S. ;

Gualdi, A. J. ;

Zabotto, F. L. ;

Cano, N. F. ;

Silva, A. C. A. ;

Dantas, N. O. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2017, 708 :619-622

[30] Synthesis Process Controlled of Semimagnetic Bi2-xMnxS3 Nanocrystals in a Host Glass Matrix [J].

Silva, R. S. ;

Silva, J. T. T. ;

Rocha, V. R. ;

Cano, N. F. ;

Silva, A. C. A. ;

Dantas, N. O. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2014, 118 (32) :18730-18735

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