An oxide sintered body is characterized in that it comprises an oxide including an In element, a Zn element, a Sn element and a Y element and that a sintered body density is equal to or more than 100.00% of a theoretical density.

A material including a body including B.sub.6O.sub.X can include lattice constant c of at most 12.318. X can be at least 0.85 and at most 1. In a particular embodiment, 0.90≤X≤1. In another particular embodiment, lattice constant a can be at least 5.383 and lattice constant c can be at most 12.318. In another particular embodiment, the body can consist essentially of B.sub.6O.sub.X.

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 sintered oxide contains In element, Y element, and Ga element at respective atomic ratios as defined in formulae (1) to (3) below,

0.80≤In/(In+Y+Ga)≤0.96  (1),

0.02≤Y/(In+Y+Ga)≤0.10  (2), and

0.02≤Ga/(In+Y+Ga)≤0.10  (3), and

Al element at an atomic ratio as defined in a formula (4) below,

0.005≤Al/(In+Y+Ga+Al)≤0.07  (4),

where In, Y, Ga, and Al in the formulae represent the number of atoms of the In element, Y element, Ga element, and Al element in the sintered oxide, respectively.

A sintered composite ceramic, including: a lithium-garnet major phase; and a grain growth inhibitor minor phase, such that the grain growth inhibitor minor phase has a metal oxide in a range of 0.1 wt. % to 10 wt. % based on the total weight of the sintered composite ceramic.

A method is described to make a metal-containing non-amorphous hard-carbon composite material that is synthesized from furan-ring containing compounds. The metals described in the process include lithium and transition metals, including transition metal oxides like lithium titanates. The non-amorphous hard-carbon component of the metal-containing non-amorphous hard-carbon composite material is characterized by a d.sub.002 peak—in the X-ray diffraction patterns—that corresponds to an interlayer spacing of >3.6 Å, along with a prominent D-band peak in the Raman spectra. These metal-containing hard-carbon composites are used for constructing electrodes for Li-ion batteries and Li-ion capacitors.

A material including a body including B.sub.6O.sub.X can include lattice constant c of at most 12.318. X can be at least 0.85 and at most 1. In a particular embodiment, 0.90≤X≤1. In another particular embodiment, lattice constant a can be at least 5.383 and lattice constant c can be at most 12.318. In another particular embodiment, the body can consist essentially of B.sub.6O.sub.X.

A sintered oxide contains In element, Y element, and Ga element at respective atomic ratios as defined in formulae (1) to (3) below,
0.80≤In/(In+Y+Ga)≤0.96  (1),
0.02≤Y/(In+Y+Ga)≤0.10  (2), and
0.02≤Ga/(In+Y+Ga)≤0.10  (3), and Al element at an atomic ratio as defined in a formula (4) below,
0.005≤Al/(In+Y+Ga+Al)≤0.07  (4),
where In, Y, Ga, and Al in the formulae represent the number of atoms of the In element, Y element, Ga element, and Al element in the sintered oxide, respectively.

There is provided a raw material for a zirconia sintered body formed by pressureless sintering and having a high fracture toughness value measured by an SEPB method, a sintered body formed from the raw material, and a method for producing at least one of the raw material and the sintered body.

Also provided is a sintered body that includes zirconia that contains a stabilizer and having a monoclinic fraction of 0.5% or more. Such a sintered body is produced by a method including using a powder that contains a stabilizer and zirconia with a monoclinic fraction of more than 70%, wherein monoclinic zirconia has a crystallite size of more than 23 nm and 80 nm or less.

The present invention provides a zirconia pre-sintered body that enables one visit treatment due to the short firing time and from which a zirconia sintered body having excellent translucency is obtained irrespective of the thickness, and a method for producing the zirconia pre-sintered body. The present invention is a method for producing a zirconia molded body, wherein the zirconia molded body comprises: zirconia; and a stabilizer capable of inhibiting a phase transformation of zirconia, at least a part of the stabilizer is undissolved in zirconia as a solid solution, and the method comprises press molding a mixed powder comprising zirconia and the stabilizer at a pressure of 175 MPa or more to obtain a zirconia molded body.