The usefulness of the SiO(2)-Si(3)N(4) system for gradient-index optics has been investigated. Dispersion data, temperature dependence of the refractive index, and physical properties are presented. Preparation techniques are discussed.

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Under high pressures and elevated temperatures, rhombic sulfur is converted to a new cubic form; this form was quenched at room temperature and pressure and studied by x-ray diffraction. Phase boundaries for this new form have been established.

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