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Study of indentation microhardness of bismuth-doped As2Se3 glasses

T. KAVETSKYY1,2, J. BORC3,* , K. SANGWAL3

Affiliation

  1. Solid State Microelectronics Laboratory, Drohobych Ivan Franko State Pedagogical University, ul. I. Franko 24, Drohobych, 82100, Ukraine
  2. Institute of Materials, Scientific Research Company “Carat”, ul. Stryjska 202, Lviv, 79031, Ukraine
  3. Department of Applied Physics, Lublin University of Technology, ul. Nadbystrzycka 38, 20-618 Lublin, Poland

Abstract

The experimental results of an investigation of the load dependence of microhardness of the surfaces of samples of (As1−xBix)2Se3 glasses with x ≤ 0.1 wt fraction are described and discussed. It was observed that, with an increase in indentation diagonal d, the microhardness HV of the samples first increases (reverse indentation size effect; reverse ISE), then decreases showing a maximum hardness Hmax (normal ISE), and finally increases again after attaining a minimum hardness Hmin (reverse ISE). The experimental data in the former two regions were analyzed by using the relation HV =H0(1+d0/d), where H0 is the load-independent hardness of a sample and the parameter d0 is related to elastic and plastic deformation of the sample. It was found that the load-independent H0 for the samples initially increases up to maximum value (for x = 0.025) and then decreases with increasing Bi content x in these regions. These results are attributed to changes caused by Bi additive in the structure of flow defects participating in plastic deformation of the (As1−xBix)2Se3 samples..

Keywords

Indentation microhardness, Indentation size effect, Load-independent hardness, As2Se3 glasses, Bismuth dopant.

Citation

T. KAVETSKYY, J. BORC, K. SANGWAL, Study of indentation microhardness of bismuth-doped As2Se3 glasses, Optoelectronics and Advanced Materials - Rapid Communications, 5, 7, July 2011, pp.755-760 (2011).

Submitted at: Jan. 21, 2011

Accepted at: July 25, 2011