43
Views
3
CrossRef citations to date
0
Altmetric
Regular Papers

Effect of synthesis methods and aging on synthesis of uvarovite garnet by ceramic and sol–gel processes

, , , &
Pages 113-121 | Published online: 18 Jul 2013
 

Abstract

The uvarovite garnet (CaO)3 (Cr2O3 )(SiO2 )3 has been synthesised (mineralised with borax to facilitate diffusion of precursors) by several sol–gel methods. Two routes for uvarovite formation have been observed: where CaCrO4 forms as an intermediate phase; and where metastable pseudowollastonite (α-CaSiO3 ) forms as an intermediate phase. Synthesis via CaCrO4 appears to be more reactive in unaged samples. The reactivity of samples can be directly related to the chemical homogeneity of raw powders, and two methods of synthesis, Pechini and alkoxide, were found to stand out for their reactivity. Aging of raw powders for 6 months inhibits nucleation. Consequently, samples without nucleating agents (i.e. chlorides), such as gels from alkoxides, lead to the stabilisation of amorphous material or metastable phases (α-CaSiO3 ) and, as a result, hinder uvarovite formation. In contrast, aged samples involving heterogeneous nucleation agents, as in the Pechini method with CaCl2 as precursor, enhance reactivity.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.