摘要:
In an Li2O—Al2O3—SiO2 transparent crystallized glass with &bgr;-quartz solid solution precipitated as main crystals, the Li+ concentration ratio an at a position of 50 nm from the surface of the glass is equal to 0.80 or less where the Li+ concentration at a position of 2000 nm from the surface is supposed to be equal to 1.
摘要:
A crystallized glass is provided. A &bgr;-quartz solid solution or a &bgr;-eucryptite solid solution is precipitated as a main crystal. The crystallized glass has a crystallization degree not less than 70 mass %, a crystal grain size not more than 0.5 &mgr;m, substantially no gap or crack occurring at boundaries of crystal grains. The crystallized glass also has a thermal expansion coefficient being negatively greater than −10×10−7/° C. within a temperature range of −40° C.˜100° C., a hysteresis of the thermal expansion coefficient within the temperature range being not more than 10 ppm, and a temperature dependence of the refractive index being not more than 13×10−6/° C.
摘要:
A glass-ceramic plate based on silicon, aluminum and lithium oxides is intended, in particular, to cover heating elements. The plate has a diffuse transmission factor of at least 50%. A process for manufacturing the plate is provided.
摘要:
A glass-ceramic substrate for a magnetic information recording medium contains, as a main crystal phase or phases, one or more crystal phases selected from the group consisting of &bgr;-quartz (&bgr;-SiO2), &bgr;-quartz solid solution (&bgr;-SiO2 solid solution), &bgr;-spodumene (&bgr;-Li2O.Al2O3.4SiO2), &bgr;-spodumene solid solution (&bgr;-Li2O.Al2O3.4SiO2 solid solution), &bgr;-eucryptite (&bgr;-Li2O.Al2O3.2SiO2, a part of Li2O being capable of being substituted by MgO and/or ZnO) and &bgr;-eucryptite solid solution (&bgr;-Li2O.Al2O3.2SiO2 solid solution, a part of Li2O being capable of being substituted by MgO and/or ZnO). Alternatively, the glass-ceramic contains, as a main crystal phase or phases, gahnite (ZnAl2O4) and/or gahnite solid solution (ZnAl2O4 solid solution). The glass-ceramic substrate has a high heat resisting property and a super flat surface capable of achieving a high recording density according to the perpendicular magnetic recording.
摘要:
Li2O—Al2O3—SiO2 crystallized glass is provided which has clarity and glass characteristics equivalent to or superior to a conventional crystallized glass, even when the content of As2O3 is decreased. The Li2O—Al2O3—SiO2 crystallized glass contains, by weight, 0.05 to 4% Sb2O3, in which the content of &bgr;-OH is 0.3 to 4/mm.
摘要翻译:提供Li2O-Al2O3-SiO2结晶玻璃,其具有与常规结晶玻璃相当或优于常规结晶玻璃的透明度和玻璃特性,即使As2O3含量降低。 Li 2 O-Al 2 O 3 -SiO 2结晶玻璃含有0.05〜4重量%的Sb 2 O 3,其中β-OH的含量为0.3〜4 / mm。
摘要:
The invention includes methods of stabilizing negative thermal expansion glass-ceramic optical waveguide substrates. The invention includes the stabilized negative thermal expansion glass-ceramic optical waveguide substrates. The stabilized substrates have very stable physical characteristics such as dimensional length when exposed to extreme environments. The stabilized substrates are used to athermalize optical waveguide devices such as optical fiber grating. The stabilized substrates are particularly well suited for providing athermalized fiber Bragg grating.
摘要:
A SiO2—Al2O3—Li2O component-based glass material, which comprises, as basic components, SiO2: 60-63 wt %; Al2O3: 23-25 wt %; and Li2O: 4-5 wt % and, as modifying components, ZrO2: 1.5-2.5 wt %; TiO2: 0.5-2.5 wt %; MgO: 0.5-1.5 wt %; ZnO: 0.5-1.2 wt %; Na2O: 0.5-2.0 wt %; and K2O: 0.5-2.0 wt %, and further comprises any one of BaO: 0.5-1.0 wt, CaO: 1.0-2.0 wt %, and B2O3: 0.01-1.0 wt %. This can be reheat-formed in a glass state and has a low thermal expansion coefficient.
摘要翻译:作为基本成分的SiO 2·Al 2 O 3·Li 2 O成分为基础的玻璃材料为SiO 2:60〜63重量% Al2O3:23-25重量% 和Li 2 O:4-5重量%,作为改性成分,ZrO 2:1.5〜2.5重量% TiO 2:0.5〜2.5重量% MgO:0.5〜1.5重量% ZnO:0.5-1.2重量% Na2O:0.5-2.0重量% K2O:0.5〜2.0重量%,进一步含有BaO:0.5〜1.0重量%,CaO:1.0〜2.0重量%,B 2 O 3:0.01〜1.0重量%。 这可以在玻璃状态下重新加热并具有低的热膨胀系数。
摘要:
A negative thermal expansion glass ceramic having a negative coefficient of thermal expansion, which is a sufficiently large absolute value in a temperature range of −40° C. to +160° C. and a method for producing the same are provided. The negative thermal expansion glass ceramic has a coefficient of thermal expansion of −25 to −100×10−7/° C. in the temperature range of −40° C. to +160° C., and comprises main crystalline phases which are one or more types selected from a group consisting of &bgr;-eucryptite solid solution (&bgr;-Li2O.Al2O3.2SiO2 solid solution), &bgr;-eucryptite (&bgr;-Li2O.Al2O3.2SiO2), &bgr;-quartz solid solution (&bgr;-SiO2 solid solution), and &bgr;-quartz (&bgr;-SiO2), wherein a total amount of crystals of the main crystalline phases can be 70 to 100% in mass percent.
摘要:
Li2O—Al2O3—SiO2 crystallized glass is provided which has clarity and glass characteristics equivalent to or superior to a conventional crystallized glass, even when the content of As2O3 is decreased. The Li2O—Al2O3—SiO2 crystallized glass consists essentially of, by weight, 60 to 75% SiO2, 17 to 27% Al2O3, 3 to 5% Li2O, 0 to 0.9% MgO, 0 to 0.9% ZnO, 0.3 to 5% BaO, 0 to 3% Na2O, 0 to 3% K2O, 0 to 4% TiO2, 1 to 4% ZrO2, 0 to 4% P2O5, 0.05 to 2% Sb2O3, 0 to 0.9% MgO+ZnO, and 0 to 4% Na2O+K2O.
摘要翻译:提供Li2O-Al2O3-SiO2结晶玻璃,其具有与常规结晶玻璃相当或优于常规结晶玻璃的透明度和玻璃特性,即使As2O3含量降低。 Li 2 O-Al 2 O 3 -SiO 2结晶玻璃基本上由以重量计组成的60至75%的SiO 2,17至27%的Al 2 O 3,3至5%的Li 2 O,0至0.9%的MgO,0至0.9%的ZnO,0.3至5%的BaO ,0〜3%的Na 2 O,0〜3%的K 2 O,0〜4%的TiO 2,1〜4%的ZrO 2,0〜4的P 2 O 5,0.05〜2的Sb 2 O 3,0〜0.9的MgO + ZnO,0〜4质量% Na2O + K2O。
摘要:
An athermal optical device and a method for producing the device, such as an athermal optical fiber reflective grating, are described. The athermal optical fiber reflective grating device comprises a negative expansion substrate, an optical fiber mounted on the substrate surface, and a grating defined in the optical fiber. The method for producing the athermal optical fiber reflective grating device comprises providing a negative expansion substrate, mounting an optical fiber with at least one reflective grating defined therein onto the substrate upper surface, and affixing the optical fiber to the substrate at at least two spaced apart locations.