A process for producing a process for producing a LnM.sub.2Cu.sub.3O.sub.x high-temperature superconductive powder, the process comprising: i) providing an aqueous solution of Ln, M and Cu and at least one mineral acid; ii) adding at least one sequestrating agent and, optionally, at least one dispersant to the solution to form a precipitate; iii) recovering the precipitate from the solution; and iv) heating the precipitate in a flow of oxygen to form the LnM.sub.2Cu.sub.3O.sub.x powder, wherein Ln is a rare earth element, preferably Y, Ce, Dy, Er, Gd, La, Nd, Pr, Sm, Sc, Yb, or a mixture of two or more thereof, and wherein M is selected from Ca, Sr, and Ba.

A cubic boron nitride sintered material comprises 30% by volume or more and 99.9% by volume or less of cubic boron nitride grains and 0.1% by volume or more and 70% by volume or less of a binder phase, the cubic boron nitride grain having a carbon content of 0.08% by mass or less, the cubic boron nitride sintered material being free of free carbon.

Provided are a dielectric material including a compound represented by Formula 1, a device including the same, and a method of preparing the dielectric material:
(1−x)K.sub.aNa.sub.bNbO.sub.3.xM(A.sub.cSb.sub.d)O.sub.3  [Formula 1] wherein, in Formula 1, M is a Group 2 element, A is a trivalent element, and 0<x<1, 0<a<1, 0<b<1, 0<c<1, 0<d<1, a+b=1, and c+d=1.

A polycrystalline cubic boron nitride comprising 96% by volume or more of cubic boron nitride, wherein the cubic boron nitride has a dislocation density of 8×10.sup.15/m.sup.2 or less, the polycrystalline cubic boron nitride comprises a plurality of crystal grains, and the plurality of crystal grains have a median diameter d50 of an equivalent circle diameter of less than 100 nm.

Provided are a dielectric material including a compound represented by Formula 1, a device including the same, and a method of preparing the dielectric material:

(1−x)K.sub.aNa.sub.bNbO.sub.3.xM(A.sub.cSb.sub.d)O.sub.3  [Formula 1] wherein, in Formula 1, M is a Group 2 element, A is a trivalent element, and 0<x<1, 0<a<1, 0<b<1, 0<c<1, 0<d<1, a+b=1, and c+d=1.

The invention relates to a porous zirconia article in particular for use in the dental or orthodontic field, the porous zirconia article comprising ZrO.sub.2: 80 to 87 wt. %, Y.sub.2O.sub.3: 3 to 5 wt. %, Al.sub.2O.sub.3: 10 to 14 wt. %, wt. % with respect to the weight of the porous zirconia article, the porous zirconia article being characterized by a BET surface from 15 to 100 m.sup.2/g. The invention also relates to a sintered zirconia article in particular for use in the dental or orthodontic field, the sintered zirconia article comprising ZrO.sub.2: 80 to 87 wt. %, Y.sub.2O.sub.3: 3 to 5 wt. %, Al.sub.2O.sub.3: 10 to 14 wt. %, wt. % with respect to the weight of the porous zirconia article, the sintered zirconia article being characterized by a corundum crystal phase content of 7 to 12 wt. % and a flexural strength of at least 2,000 MPa.

The present invention provides a zirconia pre-sintered body that can be fired into a sintered body having translucency and strength suited for dental use (particularly, at the dental clinic), even with a short firing time. The present invention relates to a zirconia pre-sintered body comprising: zirconia; and a stabilizer capable of inhibiting a phase transformation of zirconia, wherein the zirconia predominantly comprises a monoclinic crystal system, and the zirconia pre-sintered body comprises a plurality of layers that differ from each other in the content of the stabilizer relative to the total mole of the zirconia and the stabilizer.

A method produces transparent ceramics having high transmittance and no bubble defects with uniform insertion loss over the entire inner surface thereof. The method comprising the steps of: obtaining a candidate composition containing a binder, optionally a dispersant, and optionally a plasticizer; dissolving the candidate composition in a solvent, then reducing a contained solvent volume to 0.1% by mass or less, and measuring a glass transition temperature; selecting a candidate composition having a glass transition temperature of 25° C. or more and 60° C. or less as an organic additive composition; preparing the organic additive composition containing the binder, optionally the dispersant, and the plasticizer, and having the composition obtained in the selecting step; pulverizing a raw material for sintering formed from metal oxide powder and the organic additive composition to obtain a pulverized mixture; granulating the pulverized mixture; sintering the granulated mixture to obtain a sintered body; and pressurizing the sintered body.

The method for manufacturing a solid electrolyte using an LLZ material for a lithium-ion battery comprises the steps of: providing a starting material in which lanthanum nitrate [La(NO.sub.3).sub.3.6H.sub.2O] and zirconium nitrate [ZrO(NO.sub.3).sub.2.6H.sub.2O] are mixed at a mole ratio of 3:2; forming an aqueous solution by dissolving the starting material; forming a precipitate by putting ammonia, which is a complex agent, and sodium hydroxide, which adjusts the pH of a reactor, into the aqueous solution, mixing the same, and then co-precipitating the mixture; forming a primary precursor powder by cleaning, drying and pulverizing the precipitate; forming a secondary precursor powder by mixing lithium powder [LiOH.H2O] with the primary precursor powder and ball-milling the mixture so as to solidify the lithium; and forming a solid electrolyte powder by heat-treating the secondary precursor powder.

A composite material and a method of using the composite material. The composite material consists of at least 65 volume percent cubic boron nitride (cBN) grains dispersed in a binder matrix, the binder matrix comprising a plurality of microstructures bonded to the cBN grains and a plurality of intermediate regions between the cBN grains; the microstructures comprising nitride or boron compound of a metal; and the intermediate regions including a silicide phase containing the metal chemically bonded with silicon; in which the content of the silicide phase is 2 to 6 weight percent of the composite material, and in which the cBN grains have a mean size of 0.2 to 20 μm.