STP954: Crystallization of Titania Films by Thermal Heating

    Rujkorakarn, R
    Colorado State University, Fort Collins, CO

    Hsu, LS
    Colorado State University, Fort Collins, CO

    She, CY
    Colorado State University, Fort Collins, CO

    Pages: 9    Published: Jan 1986


    Abstract

    Two types of low-loss, low-scatter submicron thick titania films, deposited by ion-sputtering at room temperature, were thermally annealed in air. Upon heating to about 350°C, these amorphous films show evidence of crystallization. Using a sensitive Raman spectroscopic technique, the crystalline structures are identified as anatase in one case (Type A) and rutile in the other (Type B). This amorphous-crystalline transformation coincides with a decrease in optical transmission and small changes in refractive index and energy gap of the film, along with a dramatic increase (∼100-fold) in elastic light scattering. Further heating of Type A films beyond 900°C shows a second phase transformation to anatase-rutile mixtures.

    Keywords:

    absorption, amorphous, anatase, annealing, crystallization, extinction coefficient, ion beam, optical band gap, optical coatings, optical extinction, Raman scattering, refractive index, rutile, titania, titanium dioxide


    Paper ID: STP23126S

    Committee/Subcommittee: F01.19

    DOI: 10.1520/STP23126S


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