A zirconia sintered body that includes a transparent zirconia portion and an opaque zirconia portion has a biaxial bending strength of 300 MPa or more. In addition, the opaque zirconia portion is configured by an opaque zirconia sintered body that is any one of a dark-colored zirconia sintered body, a medium-light-colored zirconia sintered body, and a light-colored zirconia sintered body.

The present invention relates to a frequency-stable low-dielectric microwave dielectric ceramic material and a preparation method thereof. The material is prepared from the following components in percentage by mass: 70-90% of a main-phase ceramic material A, 10-30% of an auxiliary-phase ceramic material B and 0-1.0% of an oxide sintering aid C. The main-phase ceramic material A is Mg.sub.xMe.sub.ySiO.sub.2+x+y; the auxiliary-phase ceramic material B is composed of RO-bRe.sub.2O.sub.3-cTiO.sub.2, R is at least one of Ca or Sr, Re.sub.2O.sub.3 is at least two of Sm.sub.2O.sub.3, Nd.sub.2O.sub.3, Y.sub.2O.sub.3, Al.sub.2O.sub.3 and La.sub.2O.sub.3; and the oxide sintering aid C is at least one of MnO.sub.2, WO.sub.3 and CeO.sub.2.

Disclosed herein are embodiments of high Q, temperature stable materials with low dielectric constants. In particular, a two-phase material can form based on the rutile phase of titanium oxide along with a spinel structure of ZnAl.sub.2O.sub.4. This material can have a dielectric constant below 15 which is simultaneously temperature stable.

Presented here are nanocomposites and rechargeable batteries. In certain embodiments, nanocomposites a nanocomposite is resistant to thermal runaway, and useful as an electrode material in rechargeable batteries that are safe, reliable, and stable when operated at high temperature and high pressure. The present disclosure also provides methods of preparing rechargeable batteries. For example, rechargeable batteries that include nanocomposites of the present disclosure as an electrode material have, in some embodiments, an enhanced performance and stability over a broad temperature range from room temperature to high temperatures. These batteries fill an important need by providing a safe and reliable power source for devices operated at high temperatures and pressures such as downhole equipment used in the oil industry.

Presented here are nanocomposites and electrochemical storage systems (e.g., rechargeable batteries and supercapacitors), which are resistant to thermal runaway and are safe, reliable, and stable electrode materials for electrochemical storage systems (e.g., rechargeable batteries and supercapacitors) operated at high temperature and high pressure, and methods of making the same.

The present invention relates to a method for obtaining calcium aluminates for metallurgical use from non-saline aluminum slags by means of reactive grinding and thermal treatment.

A dielectric ceramic composition and a multilayer ceramic electronic component are provided, the dielectric ceramic composition includes a barium titanate base material main component and a subcomponent, a microstructure after sintering includes a first crystal grain including 3 or less domain boundaries and a second crystal grain including 4 or more domain boundaries, and an area ratio of the second crystal grain to the total crystal grains is 20% or less.

Ceramic particles for use in a solar power tower and methods for making and using the ceramic particles are disclosed. The ceramic particle can include a sintered ceramic material formed from a mixture of a ceramic raw material and a darkening component comprising MnO as Mn.sup.2+. The ceramic particle can have a size from about 8 mesh to about 170 mesh and a density of less than 4 g/cc.

A capacitor component includes: a body including a dielectric layer and an internal electrode layer; and an external electrode disposed on the body, and connected to the internal electrode layer. A surface color of the body is R30, G30, B40 based on R/G/B, and a dielectric constant of the dielectric layer is 2000 or more and 4000 or less.

A piezoelectric composition having a complex oxide including potassium and niobium, in which the complex oxide has a first phase represented by a compositional formula KNbO.sub.3, and one or two phases selected from a second phase represented by a compositional formula K.sub.4Nb.sub.6O.sub.17 and a third phase represented by a compositional formula KNb.sub.3O.sub.8.