| http://www.w3.org/ns/prov#value | - quartz solid solution, and the reference says that the material is particularly useful for a protective outer layer for the molten silica or useful for a cladding layer for another optical fiber waveguide member. [0015] However, because the glass ceramic includes much TiO2 to make the crystals fine and therefore lacks for stability of glass, only a thin material thereof can be obtained.
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