Titanium Containing Monocrystals of Ruby and Sapphire

Abstract

The aim of this study was to obtain synthetic corundum monocrystals, called star ruby and star sapphire, using the Verneuil flame fusion process. The corundum monocrystals are known to possess an unusual complex of properties which determine their increasing application in different areas of jewelry and technology The optimal temperature-time parameters during obtaining the starting mixtures which contribute to the synthesis of high quality corundum monocrystals were established. The corundum monocrystals obtained are equivalent to the natural gemstones -rubies and sapphires.

Surface and bulk 3D analysis of natural and processed ruby using electron probe micro analyzer and X-ray micro CT scan

“…Such fissure networks have been interpreted as the rutile fissures formed due to high temperature heat treatment. Similar, type of fissure lines are also observed during the heat treatment of ruby [25][26][27] and cobaltdoped glass-filled sapphires [28]. This type of fissure line is an indication of the heat treated ruby or corundum stone and also confirms the presence of Pb-filled fissures and rutile fissures in the corundum.…”

Low cost porous alumina with tailored gas permeability and mechanical properties prepared using rice husk and sucrose for filter applications

“…Similar observation has also been reported by other researchers. 50 It is important to note that presence of silica in RH is an additional advantage, as it reacts with alumina at high temperature to form a stable phase, mullite, in alumina matrix during firing of samples. …”