Galvanomagnetic properties of Bi85Sb15 thin films on glass and glass-ceramic substrates
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SUSLOV, A., KOMAROV, Vladimir, SUSLOV, Michail. Galvanomagnetic properties of Bi85Sb15 thin films on glass and glass-ceramic substrates. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 245. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Galvanomagnetic properties of Bi85Sb15 thin films on glass and glass-ceramic substrates


Pag. 245-245

Suslov A., Komarov Vladimir, Suslov Michail
 
Herzen State Pedagogical University of Russia
 
Disponibil în IBN: 1 august 2019


Rezumat

The results of research of Bi85Sb15 films, obtained by discrete thermal spraying method, are presented in the work. Glass and glass-ceramic were used as substrates. These substances have different thermal expansion (glass - 7∙10-6 К-1, glass-ceramic - 5∙10-6 К-1), which is lower that has Bi85Sb15 alloy in trigonal plane (11∙10-6 К-1). All films were obtained in similar conditions: vacuum– 10-5 Torr, temperature of substrate – 400 К, temperature of annealing – 540 К, time of annealing – 30 min.   Bismuth-antimony alloys are very sensitive to deformations, so the difference of thermal expansion of the substrate and the film may have significant effect on the properties of the films, as the filmsubstrate system is inseparable [1].   X-ray diffraction studies of the films shown that trigonal plane of film crystal substantially coincides with the plane of the film. AFM studies of the films’ surfaces shown that they have block structure. Size of the blocks increases with film thickness increasing. Size of the blocks on the glass-ceramic is less than on the glass. Misorientation of trigonal plane relatively the plane of the film in blocks is significantly larger in films on glass-ceramic. The exit of microcrystals consisting the surface of glass-ceramic is the reason for this.     For obtained films of Bi85Sb15 the dependences of temperature resistivity, magnetoresistance and Hall coefficient were studied. The studies were conducted in the temperature range of 77 – 300 К and magnetic field up to 0.65 T. The results are presented by the films with thickness 0,3 μm 1 μm as example.    The temperature dependences of a) resistivity, b) magnetoresistance, c) Hall coefficient   The temperature dependence of the resistivity of all the films has a semiconductor character. The resistivity of the films of the same thickness on glass-ceramic is larger than the similar on the glass. Magnetoresistance of all the films increases with decreasing of the temperature. Magnetoresistance of 0,3 μm films is less than 1 μm films have, according to classical size effect. At 77 К the films with thickness of 1 μm on the glass-ceramic have lesser magnetoresistance than the similar on the glass. It corresponds to the changes in crystal lattice of the film resulting deformation in the substrate-film system. In the films of 0,3 μm ratio of magnetoresistances is reverce probably due to the contribution of the size effect. Hall coefficient has negative value, so for films of 1 μm the dependences match. Hall value for the films of 0,3 μm is greatly lower according to the value of the mobility of the charge carriers.