Nano- and micro-indentation studies on lithium borate-barium bismuth niobate glasses

Das, Kaushik and Karthik, C and Varma, KBR and Ramamurty, U (2008) Nano- and micro-indentation studies on lithium borate-barium bismuth niobate glasses. In: Journal of Non-Crystalline Solids, 354 (32). pp. 3793-3798.

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Abstract

The structure and mechanical properties of multifunctional lithium tetra-borate based glasses and glass–ceramics of the system $(100-x) Li_2B_4O_{7-}x(Bao-Bi_2O_3-Nb_2O_5)$ with x = 10, 20 and 30 in molar ratio, have been characterized. Nano- and micro-indentation techniques were employed to evaluate the elastic modulus, hardness and toughness of the as-cast and annealed glasses. These were complemented with detailed structural investigations using X-ray diffraction, microscopy (optical, scanning electron and high resolution transmission electron microscopies) and nuclear magnetic resonance spectroscopy. These investigations reveal a smooth variation of the mechanical properties with composition except for the composition corresponding to x=20. This deviation has been attributed to subtle changes in the glass structure due to amorphous phase-separation and heat-treatment-assisted nano-crystallization.

Item Type:	Journal Article
Publication:	Journal of Non-Crystalline Solids
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Crystallization;Glass–ceramics;Mechanical properties;Fracture;Hardness;Indentation;Microindentation;Borates.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	13 Oct 2008 07:10
Last Modified:	19 Sep 2010 04:50
URI:	http://eprints.iisc.ac.in/id/eprint/16008

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