Journal of Physical Studies 4(2), 185–189 (2000) DOI: https://doi.org/10.30970/jps.04.185 ON THE INFLUENCE OF THE NiSi2-PHASE DISTRIBUTION UPON THE MAGNETIC SUSCEPTIBILITY IN Si–Ni POLYCRYSTALS RICH ON SILICON

V. М. Tsmots², V. S. Shtym², B. D. Belan¹, О. I. Bodak¹, V. S. Protasov²

¹Ivan Franko National University of Lviv, Chemical Department,
8a Kyrylo i Mefodii Str., Lviv, UA-79005, Ukraine
²Ivan Franko Drohobych State Pedagogical University,
24 I. Franko Str., Drogobych, UA-82100, Lviv Region, Ukraine

The results of the investigation of the NiSi$_{2}$-phase distribution upon the static magnetic susceptibility (MS, $χ $) of the Si-Ni polycrystals rich in silicon are presented. The measurements of MS of these alloys immediately after their fusing demonstrated that, on the one hand, the value of MS for all samples is not equal to the sum of MS components (i.e. the rule of additivity is violated) and, on the other hand the non-linearity of the dependence of MS upon the tension of magnetic field $\left( χ (H)\right) $ is observed here. The first circumstance is in our opinion connected with the large quantity of structural defects and the second one with the presence of magnetic ordering of electron spins on the dislocation structures. To verify our assumptions we carried out the heat treatments of the samples in two regimes: at $400^{\circ}$ C and $800^{\circ}$ C during 21 days in either case. The heat treatment of the samples at $400^{\circ}$ C led only to an increase of diamagnetism (which is connected with the annealing of paramagnetic centres), but did not influence the $χ (H)$ character. The heat treatment of the samples at $800^{\circ}$ C led to the disappearance of the non-linearity of the $χ (H)$ dependences. The magnetic susceptibility of the polycrystals after their heat treatment at $800^{\circ}$ C is satisfactorily described by the additivity law.

The assumption is made that the method of measuring the MS can be used for the investigation of the character of the distribution of separate phases in many-component semiconductor compounds.

PACS number(s): 75.50.-y, 61.10.-i.

ps pdf