Structural, morphological and optical investigations of θ-Al2O3 ultrafine powder

• Main Authors: Jbara, A. S., Othaman, Z., Saeed, M. A.
• Format: Article
• Published: Elsevier Ltd 2017
• Subjects: QC Physics
• Online Access: http://eprints.utm.my/id/eprint/76408/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019092721&doi=10.1016%2fj.jallcom.2017.05.085&partnerID=40&md5=3680899e10172f7d991f88a4a9c3ed0b

Single-phase θ-Al2O3 nanopowder has been synthesized by co-precipitation technique. The synthesized powders were sintered at a temperature ranging from 900 to 1200 °C. A stable monoclinic phase is observed for the whole sintering temperature range. The purity, chemical bonds, morphology and optical properties of the powders were investigated by different characterization techniques. X-ray diffraction and Brunauer–Emmett–Teller analysis confirms the existence of ultrafine alumina powders with particle diameter of ∼5 nm and surface area of 100 m2/g. The novel optical results such as band gap of 5.8 eV would reveal the viability of observed phase of alumina in advanced semiconductor applications.