Aesthetic improvement of transparent natural quartz by heat treatment at different temperature
by Rakesh Kumar Sahoo; Biswabhusan Dhal; Saroj Kumar Singh; B.K. Mishra
International Journal of Nano and Biomaterials (IJNBM), Vol. 7, No. 3, 2018

Abstract: Attempt has been made by us to improve the aesthetic value of natural gem variety transparent quartz of Odisha through heat treatment with cobalt oxide powder and the results are reported. A series of experiments have been performed at different temperature with cobalt oxide as additive. The change in colour and chemistry on the surface of the treated stones with respect to the untreated one were compared. Visual observation indicated the blue tone and change in its intensity with increase in temperature. Phase change of materials after heat treatment has been analysed using thermogravimetric analysis. Qualitative elemental analysis using electron probe micro analyser confirmed the presence and change in cobalt content in the quartz matrix with variation in the treatment temperature. Moreover, in this work, improvement in aesthetic value of the quartz stone and its consequent change in surface chemical and physical characteristics before and after heat treatment at different temperatures have been compared and described.

Online publication date: Thu, 23-Aug-2018

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nano and Biomaterials (IJNBM):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com