title: Stabilization of high temperature hexagonal phase of SrAl2O4 at room temperature: role of ZnO.
abstract: Strontium aluminate (SrAl2O4) exhibits a monoclinic structure at room temperature (RT) and transforms to a hexagonal structure at above 650 °C, reported previously in the literature. In this article, we have shown a stable, high temperature hexagonal phase of SrAl2O4 (SAO) at RT by synthesizing a SAO-ZnO composite through a combustion technique. While SAO crystallizes in the monoclinic phase by adding 2.5 wt% of ZnO, a stable hexagonal phase of SAO at RT has been obtained for 20 wt% of ZnO. Further, the hexagonal phase of SAO transforms to a monoclinic phase after increasing the calcination temperature from 700 to 1200 °C. The role of ZnO in determining the structure and photoluminescence properties of these composites are discussed.
authors: School of Materials Science and Technology, Indian Institute of Technology, (BHU), Varanasi, 221005, India. vinay.phy@gmail.com chandanarath@yahoo.com.
authors: V P
authors: VP
authors: Singh
authors: S B
authors: SB
authors: Rai
authors: H
authors: H
authors: Mishra
authors: Chandana
authors: C
authors: Rath