In a piezoelectric ceramic composition including potassium sodium niobate, a transition temperature at which a phase transition between an orthorhombic crystal structure and a tetragonal crystal structure occurs lies in a temperature range of −20° C. or higher and 60° C. or lower. In the piezoelectric ceramic composition, αt/αO is 0.72 or more, where αO represents a coefficient of linear expansion determined when a crystal structure is orthorhombic in the temperature range, and αt represents a coefficient of linear expansion determined when a crystal structure is tetragonal in the temperature range.

Provided according to embodiments of the invention are varistor ceramic formulations that include zinc oxide (ZnO). In particular, varistor ceramic formulations of the invention may include dopants including an alkali metal compound, an alkaline earth compound, an oxide of boron, an oxide of aluminum, or a combination thereof. Varistor ceramic formulations may also include other metal oxides. Also provided according to embodiments of the invention are varistor ceramic materials formed by sintering a varistor ceramic formulation according to an embodiment of the invention. Further provided are varistors formed from such ceramic materials and methods of making such materials.

A surface-enhanced Raman scattering (SERS) substrate and its method of formation is disclosed. The surface-enhanced Raman scattering (SERS) substrate comprises a solid support, a first noble metal nanoparticles is disposed on the solid support, a porous oxide layer comprising transition metal oxide nanoparticles is disposed on the first noble metal nanoparticles and a second noble metal nanoparticles is disposed on the porous oxide layer. The porous oxide layer prevents contact between the first noble metal nanoparticles and the second noble metal nanoparticles and has a mean pore size of 2 to 30 nm.

The present invention discloses photostable composite of indium gallium nitride and zinc oxide for solar water splitting, comprising Indium content in the range of 1-40 wt %, Ga content in the range of 1 to 15 wt %, nitrogen content in the range of 0.1 to 5 wt %, and the remaining is ZnO. The combustion synthesis comprises the steps of: (a) dissolving 45 to 55 wt % urea, 75 to 80 wt % Zinc nitrate, 3 to 5 wt % Gallium nitrate, and 15 to 20 wt % Indium nitrate in water with stirring until a homogenous solution is formed; and (b) heating the homogenous solution of step (a) at a temperature in the range of 450-550 [deg.]C. for period in the range of 2 to 20 min to obtain the photostable composite.

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.

LTCC devices are produced from dielectric compositions Include a mixture of precursor materials that, upon firing, forms a dielectric material having a zinc-lithium-titanium oxide or silicon-strontium-copper oxide host.

A dielectric ceramic composition includes a base material main component of barium titanate and a subcomponent. A microstructure of the dielectric ceramic composition after sintering includes a first grain having a Ca content of less than 3.5 at % and a second grain having a Ca content of 3.5 to 13.5 at %, and an area ratio of the second grain to an area of the total grains is 70% to 95%.

A ceramic composition according to an embodiment of the present invention contains: a main phase component represented by CaMgSi.sub.2O.sub.6 or Ba.sub.4(Re.sub.(1-x), Bi.sub.x).sub.9.33Ti.sub.18O.sub.54; and an additive component containing a Li component and a B component, An observation field, a part of a sectional surface of the ceramic composition, is divided into a plurality of unit observation regions. Among all the unit observation regions, those containing no or little sintering agent component are referred to as the main crystal regions. An area percentage of main crystal regions relative to the observation field is 30% or more, the main crystal regions being the unit observation regions containing 0.5% or less by area of the additive component.

Provided is a silicate glass, a method for preparing a silicate glass-ceramics by using the silicate glass, and a method for preparing a lithium disilicate glass-ceramics by using the silicate glass, and more particularly, to a method for preparing a glass-ceramics that has a nanosize of 0.2 to 0.5 μm and contains lithium disilicate and silicate crystalline phases. A nano lithium disilicate glass-ceramics containing a SiO.sub.2 crystalline phase includes: a glass composition including 70 to 85 wt % SiO.sub.2, 10 to 13 wt % Li.sub.2O, 3 to 7 wt % P.sub.2O.sub.5 working as a nuclei formation agent, 0 to 5 wt % Al.sub.2O.sub.3 for increasing a glass transition temperature and a softening point and enhancing chemical durability of glass, 0 to 2 wt % ZrO.sub.2, 0.5 to 3 wt % CaO for increasing a thermal expansion coefficient of the glass, 0.5 to 3 wt % Na.sub.2O, 0.5 to 3 wt % K.sub.2O, and 1 to 2 wt % colorants, and 0 to 2.0 wt % mixture of MgO, ZnO, F, and La.sub.2O.sub.3.

The present invention discloses a multiphase ceramic material with a giant dielectric constant, wherein the multiphase ceramic material has a general formula of A.sub.xB.sub.nxTi.sub.1−(n+1)xO.sub.2; wherein A is at least one selected from the group consisting of Nb, Ta, V, Mo, and Sb, B is at least one selected from the group consisting of In, Ga, Al, Co, Cr, Sc, Fe (III), and a trivalent rare-earth cation; n is a molar ratio of B to A, 1<n≤5 , 0<x≤0.1. The multiphase ceramic material possesses outstanding properties including a giant dielectric constant, a low dielectric loss, and excellent frequency- and temperature-stability. In particular, it exhibits a high insulation resistivity of higher than 10.sup.11 Ω.Math.cm and a high breakdown voltage, which implies it can be applied in high-energy storage devices and supercapacitors. This invention also provides a method to synthesize the multiphase ceramic material.