Glass-ceramics having hexacelsian as a primary crystal phase, magnetic disk substrate and magnetic disk
AssigneeNGK Insulators, Ltd.
InventorsMasahiro Abe, Takahiro Takahashi, Fuminori Takeya, Atsushi Watanabe
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Abstract
A glass-ceramic has a hexacelsian as a primary crystal phase and is characterized by satisfying a relation of 0≦I(101)/I(110)≦1.5 when a diffraction intensity of (101) face of hexacelsian in an X-ray diffraction is I(101) and a diffraction intensity of (110) face thereof is I(110).
Claims15
A glass-ceramic having a hexacelsian as a primary crystal phase, characterized by satisfying a relation of 0≦I(101)/I(110)≦1.5 when a diffraction intensity of (101) face of hexacelsian in an X-ray diffraction is I(101) and a diffraction intensity of (110) face thereof is I(110).
A glass-ceramic characterized by ceramming a precursor glass comprising 43-57 mol % of SiO2, 7-15 mol % of Al2O3, 13-21 mol % of MgO, 4-12 mol % of BaO, 2-6 mol % of K2O and 5-9 mol % of TiO2 through a heat treatment.
Dependencies are inferred from the claim text.