scholarly journals МОДЕЛИРОВАНИЕ ВЗАИМОДИФФУЗИИ И ФАЗООБРАЗОВАНИЯ В ТОНКОПЛЕНОЧНОЙ ДВУХСЛОЙНОЙ СИСТЕМЕ ПОЛИКРИСТАЛЛИЧЕСКИХ ОКСИДОВ ТИТАНА И КОБАЛЬТА

2019 ◽  
Vol 21 (3) ◽  
pp. 358-365
Author(s):  
Nikolay N. Afonin ◽  
Vera A. Logacheva
Keyword(s):  
Room Temperature ◽  
Solid Phase ◽  
Condensed Matter ◽  
Room Temperature Ferromagnetism ◽  
Tio2 Anatase ◽  
Binary Metal Oxides ◽  
Solid Phase Reactions ◽  
Zinc Diffusion ◽  
Metal Doped ◽  
Thin Fi Lm

Предложена модель, развивающая теорию Даркена взаимной диффузии в бинарной системе с неограниченной растворимостью, на случай реакционной взаимодиффузии в двухслойной системе, состоящей из поликристаллических фаз оксидов двух металлов и содержащей подвижные и неподвижные компоненты в каждой из фаз. В рамках модели проведён численный анализ экспериментальных концентрационных распределений титана и кобальта в тонкоплёночной системе TiO2-x–Co1-yO, полученных методом резерфордовского обратного рассеяния, при отжиге в вакууме. Анализ выявил доминирующую роль диффузии подвижного кобальта в фазу TiO2-x  по сравнению с диффузией подвижного титана в фазу Co1-yO и область локализации образования фаз сложных окси-дов в окрестности межфазной границы TiO2-x–Co1-yO.       REFERENCES Chebotin V. N. Fizicheskaya khimiya tverdogo tela [Physical chemistry of a solid body]. M.: Khimiya Publ., 1982, 320 p. (in Russ.) Tretyakov Yu. D. Tverdofaznye reaktsii [Solid phase reactions]. M.: Khimiya Publ., 1978, 360 p. (in Russ.) Afonin N. N., Logacheva V. A. Interdiffusion and phase formation in the Fe–TiO2 thin-fi lm system. Semiconductors, 2017, v. 51(10), pp. 1300–1305. https://doi.org/10.1134/S1063782617100025 Afonin N. N., Logacheva V. A. Cobalt modifi cation of thin rutile fi lms magnetron-sputtered in vacuum technical. Technical Physics, 2018, v. 63(4), pp. 605–611. https://doi.org/10.1134/S1063784218040023 Kofstad P. Nonstoichiometry, diffusion, and electrical conductivity in binary metal oxides. Wiley-Interscience, 1972, 382 p. Smigelskas A. D., Kirkendall E. O. Zinc Diffusion in alpha brass. Trans. AIME, 1947, v. 171, pp. 130–142. Chambers S. A., Thevuthasan S., Farrow R. F. C., Marks R. F., Thiele J. U., Folks L., Samant M. G., Kellock A. J., Ruzycki N., Ederer D. L., Diebold U. Epita xial growth and properties of ferromagnetic co-doped TiO2 anatase. Appl. Phys. Lett., 2001, v. 79, pp. 3467–3469. https://doi.org/10.1063/1.1420434 Matsumoto Y., Murakami M., Shono T., Hasegawa T., Fukumura T., Kawasaki M., Ahmet P., Chikyow T., Koshihara S., Koinumaet H. Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide. Science, 2001, v. 291, pp. 854–856. https://doi.org/10.1126/science.1056186 Darken L. S. Diffusion, mobility and their interrelation through free energy in binary metallic systems. Trans. AMIE, 1948, v. 175, pp. 184–190. Samarsky A. A. [Theory of difference schemes]. M.: Nauka Publ., 1977, 656 с. (in Russ.) Afonin N. N., Logacheva V. A., Gerasimenko Yu. A., Dolgopolova E. A., Khoviv A. M. Interaction of cobalt and titanium with thin fi lms of their oxides during vacuum annealing // [Condensed Matter and Interphase], 2013, v. 15 (3), p. 232-237. URL: https://journals.vsu.ru/kcmf/article/view/902/984 (in Russ.)

Room Temperature Ferromagnetism in Transition Metal Doped TiO2 Nanowires

2009 ◽  
Vol 1 (3) ◽  
pp. 227-229 ◽  
Author(s):  
Dewei Chu ◽  
Yu-Ping Zeng ◽  
Dongliang Jiang ◽  
Yoshitake Masuda
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Metal Doped

Room temperature ferromagnetism in transition metal-doped black phosphorous

2018 ◽  
Vol 112 (19) ◽  
pp. 192105 ◽  
Author(s):  
Xiaohong Jiang ◽  
Xinwei Zhang ◽  
Fang Xiong ◽  
Zhenghe Hua ◽  
Zhihe Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Black Phosphorous ◽  
Metal Doped

scholarly journals Получение, структура, диэлектрические и магнитные свойства керамики SrFe-=SUB=-2/3-=/SUB=-W-=SUB=-1/3-=/SUB=-O-=SUB=-3-=/SUB=-

2018 ◽  
Vol 60 (3) ◽  
pp. 510
Author(s):  
А.В. Павленко ◽  
А.В. Турик ◽  
Л.А. Шилкина ◽  
С.П. Кубрин ◽  
Ю.B. Русалев ◽  
...  
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Solid Phase ◽  
Ceramic Technology ◽  
Tetragonal Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid Phase Reactions ◽  
Perovskite Type ◽  
Perovskite Type Structure

AbstractPolycrystalline samples of SrFe_2/3W_1/3O_3 (SFWO) ceramic were obtained by solid-phase reactions with subsequent sintering using conventional ceramic technology. X-ray diffraction analysis showed that at room temperature, the SFWO ceramic is single-phase and has a perovskite-type structure with tetragonal symmetry and parameters a = 3.941(9) Å, c = 3.955(6) Å, and c/a = 1.0035. In studying the magnetic properties and the Mössbauer effect in SFWO ceramics, it is found that the material is a ferrimagnet, and the iron ions are only in the valence state of Fe^3+. It is suggested that in the temperature range of T = 150–210°C, a smeared phase transition from a cubic (paraelectric) phase to a tetragonal (ferroelectric) phase takes place in SFWO with decreasing temperature.

Search for Room Temperature Ferromagnetism in Low-Concentration Transition Metal Doped ZnO Nanocrystalline Powders Using a Microscopic Technique

2010 ◽  
Vol 46 (6) ◽  
pp. 1780-1783 ◽  
Author(s):  
Rakesh Dogra ◽  
Artur W. Carbonari ◽  
Márcio E. Mercurio ◽  
Moacir R. Cordeiro ◽  
Juliana M. Ramos ◽  
...  
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Nanocrystalline Powders ◽  
Microscopic Technique ◽  
Low Concentration ◽  
Doped Zno ◽  
Metal Doped

scholarly journals Improving the Room-Temperature Ferromagnetism in ZnO and Low-Doped ZnO:Ag Films Using GLAD Sputtering

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5337
Author(s):  
Marcio A. Correa ◽  
Armando Ferreira ◽  
Raphael M. Tromer ◽  
Leonardo D. Machado ◽  
Matheus Gamino ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Ferromagnetic Metal ◽  
Zno Films ◽  
Ferromagnetic Behavior ◽  
Sensor Element ◽  
Promising Candidate ◽  
Doped Zno ◽  
Metal Doped

ZnO and doped ZnO films with non-ferromagnetic metal have been widely used as biosensor elements. In these studies, the electrochemical measurements are explored, though the electrical impedance of the system. In this sense, the ferromagnetic properties of the material can be used for multifunctionalization of the sensor element using external magnetic fields during the measurements. Within this context, we investigate the room-temperature ferromagnetism in pure ZnO and Ag-doped ZnO films presenting zigzag-like columnar geometry. Specifically, we focus on the films’ structural and quasi-static magnetic properties and disclose that they evolve with the doping of low-Ag concentrations and the columnar geometry employed during the deposition. The magnetic characterization reveals ferromagnetic behavior at room temperature for all studied samples, including the pure ZnO one. By considering computational simulations, we address the origin of ferromagnetism in ZnO and Ag-doped ZnO and interpret our results in terms of the Zn vacancy dynamics, its substitution by an Ag atom in the site, and the influence of the columnar geometry on the magnetic properties of the films. Our findings bring to light an exciting way to induce/explore the room-temperature ferromagnetism of a non-ferromagnetic metal-doped semiconductor as a promising candidate for biosensor applications.

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