title: Temperature-dependent phase stability of nanocrystalline SiO2.
abstract: Nanocrystalline powder of SiO2, synthesized by gas phase condensation, has been characterized by X-ray and electron diffractometric techniques. The composition of the as-received powder is mostly amorphous and a minor amount of alpha-crystobalite phase. Annealing at higher temperatures, the amorphous phase gradually transforms into small crystallites of alpha-crystobalite. Subsequently, the tiny crystallites form small domains in the structural form of beta-crystobalite.
authors.affiliation: Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur--721302, India.
authors.forename: Sampa
authors.initials: S
authors.lastname: Dhabal
authors.forename: T B
authors.initials: TB
authors.lastname: Ghosh
mesh_terms: D003460:Crystallization / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D044367:Phase Transition; D012822:Silicon Dioxide / Q000032:analysis* / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D012822:Silicon Dioxide