Growth and calorimetric measurements on $CsLiB_6O_{10}$

Karnal, AK and Bhaumik, Indranil and Ganesamoorthy, S and Bhatt, R and Saxena, A and Wadhawan, VK and Bhat, HL (2007) Growth and calorimetric measurements on $CsLiB_6O_{10}$. In: Materials Letters, 61 (2). pp. 600-604.

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Abstract

Single crystals of cesium lithium borate (CLBO) were grown from stoichiometric melt, as well as from $B_2O_3$ deficient flux. Calorimetric measurements performed on the grown crystals show that the material transforms to glassy phase from the molten phase even at cooling rates as low as $1^oC/min$. The transformation to the crystalline phase from the glass phase does not occur during the heating cycle in the DTA experiments. In order to estimate the onset of crystallization temperature of CLBO glass and ensure the appearance of crystallization peak during heating cycle,a new approach (seeded crystallization) was adopted in the DTA experiments. The onset of seeded crystallization temperature shows a strong dependence on the heating and cooling rates. The activation energy of seeded crystallization determined by Kissinger method turns out to be 3.07 eV. The ergodicity making (EM) of the glass transition as seen from the DSC measurement is $\sim424^oC$ for a heating rate of 5 °C/min. Microscopic examination suggests that the glass CLBO transforms to crystalline phase via. dendrites.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier
Keywords:	Crystal growth; Glasses; Solidification; Thermal properties
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	13 Mar 2007
Last Modified:	19 Sep 2010 04:34
URI:	http://eprints.iisc.ac.in/id/eprint/9709

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