Abstract:
本発明は、従来の希土類付活サイアロン蛍光体より高い発光輝度を有する酸窒化物蛍光体を提供することにある。その解決手段は、酸窒化物蛍光体の材料設計を一般式MA1(Si 6-z Al z )N 10-z O z (ただし、MはLa、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる1種または2種以上の元素)で示されるJEM相を主成分として生成せしめ、これによって例えば、蛍光スペクトル最大発光波長が420nm以上500nm以下、励起スペクトル最大励起波長が250nm以上400nm以下の高輝度の酸窒化物蛍光体を提供しうるものである。
Abstract:
The present invention relates to a superconducting material, and in particular to a magnesium borate superconductor which is doped with a silicon carbide or titanium carbide dopant.
Abstract:
In present invention, the c-axis/a-axis ratio is set in the range of 1.005 through 1.009 in a tetragonal-perovskite-type crystal structure of BaTiO 3 ,. The present invention provides a ceramic capacitor having a large capacity and a method of manufacturing it.
Abstract:
A honeycomb structure (1) which is partitioned by a partition wall (2) and has a large number of communicating holes (3) passing through in the X axis direction, characterized in that it comprises a Si phase controlled to have a lattice constant of 0.54302 to 0.54311 at room temperature; a method for manufacturing a honeycomb structure which comprises a firing step of firing a precursor of the honeycomb structure; a method for manufacturing a honeycomb structure which comprises using a precursor containing a Si phase and performing the firing step by the use of a ceramic material free of a boron-containing compound; a method for manufacturing a honeycomb structure which comprises suppressing the percentage of the reduction in the Si content of the Si phase between the Si phase prior to the firing step and that after the firing step to 10 mass % or less. The above honeycomb structure has improved thermal conductivity, which leads to the manufacture of the structure excellent in the resistance to heat shock.
Abstract:
This invention provides compositions of the formula Na 0.5 M 0.5 Cu 3 Ti 4 O 12 Wherein M = La-Lu, Y, Bi or mixtures thereof. These compositions have high dielectric constant and low loss over a frequency range of from about 1 kHz to about 1 MHz.
Abstract translation:本发明提供了式Na> 0.5Mu 3/3 Ti 4 O 12的组合物,其中M = La-Lu,Y,Bi或其混合物。 这些组合物在约1kHz至约1MHz的频率范围内具有高介电常数和低损耗。
Abstract:
A novel intermetallic compound superconducting material, characterized in that it comprises magnesium (Mg) and beryllium (Be); an alloy containing the intermetallic compound; and a method for preparing the intermetallic compound or the ally, which comprises admixing raw material powders containing Mg, Be or a metal for use in the alloy,respectively, and, for example, pressing, heating and forming the resultant mixed powder. Preferably, the intermetallic compound superconducting material is represented by the chemical empirical formula: Mg1Be2 and has a hexagonal AlB2 type crystal structure, and such an intermetallic compound exhibits a supercoductive transition temperature (Tc) of 35 K, which is higher than those of the conventional alloy superconducting materials. An alloy containing the above specific intermetallic compound and B is excellent in ductility and malleability, has a supercoductive transition temperature (Tc) of 35 K and exhibits a lowered resistivity for normal conduction over temperatures from the supercoductive transition temperature to room temperature. The intermetallic compound or the ally can be prepared by the above method which is excellent in reproducibility and is practiced at a low cost.
Abstract:
This invention provides tunable devices incorporating the dielectric CaCu3Ti4O12. CaCu3Ti4O12 is especially useful in tunable devices such as phase shifters, matching networks, oscillators, filters, resonators, and antennas comprising interdigital and trilayer capacitors, coplanar waveguides and microstrips.
Abstract translation:本发明提供了包含电介质CaCu 3 Ti 4 O 12的可调谐器件。 CaCu3Ti4O12在诸如移相器,匹配网络,振荡器,滤波器,谐振器以及包括叉指和三层电容器,共面波导和微带的天线的可调谐器件中特别有用。
Abstract:
This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1-xLnxTi1-xMxO3 wherein when Ln is La, M is Fe or Cr, when Ln is Sm, M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-xFexO3 wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-x/4-3a/4Alca(x-a)/4O3 wherein c denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.These low loss tunable ferroelectric compositions are especially useful in tunable microwave thin film devices which fall into three types: interdigital and trilayer capacitors, coplanar waveguides and microstrips.
Abstract:
Disclosed is a microcracked ceramic body, comprising a predominant phase (greater than 50 wt%) of zirconium tin titanate and a dilatometric coefficient of thermal expansion (CTE) from 25 to 1000C of not more than 40x10 -7 °C -1 as measured by dilatometry and methods for the manufacture of the same.
Abstract:
Ceramic materials and ceramic bodies are disclosed herein, such as low thermal expansion ceramic materials or ceramic bodies, such as ceramic bodies comprising a benitoite-type phase.