The invention relates to a method for producing ceramics having piezoelectric properties in predominantly aqueous suspending agents.

The invention relates to a method for producing ceramics having piezoelectric properties in predominantly aqueous suspending agents.

A process for preparing a porous ceramic body includes forming a green body with a mixture of ceramic material powder, binder material, and pore-forming particles. The process further includes extracting the binder material, decomposing the pore-forming particles, and removing residual organic materials from the green body at respective, progressively higher pre-firing temperatures. After these three stages, the green body is sintered at a still-higher temperature to form the porous ceramic body. Embodiments facilitate manufacturing and can render most or all surface grinding unnecessary, allowing electrode deposition directly onto substantially non-porous surfaces of the porous ceramic body that are naturally formed during sintering. Advantageously, the green body may be formed into net shape by injection molding the mixture that includes the pore-forming particles, and embodiments can result in porous ceramic bodies that are much thicker than currently available, with better structural integrity.

A manufacturing method of a dielectric ceramic composition includes attaching a reactive functional group to a surface of a base material powder particle of a perovskite structure.

Provided are a dielectric material including a composite represented by Formula 1, a device including the same, and a method of preparing the dielectric material:
xAB.sub.3.(1−x)(Bi.sub.aNa.sub.b)TiO.sub.3  [Formula 1] wherein, in Formula 1, A is at least one element selected from among lanthanum group elements, rare earth metal elements, and alkaline earth metal elements, B is at least one element selected from transition metal elements, 0.1<x<0.5, 0<a<1, 0<b<1, and a+b=1.

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

xAB.sub.3.(1−x)(Bi.sub.aNa.sub.b)TiO.sub.3   [Formula 1] wherein, in Formula 1, A is at least one element selected from among lanthanum group elements, rare earth metal elements, and alkaline earth metal elements, B is at least one element selected from transition metal elements, 0.1<x<0.5, 0<a<1, 0<b<1, and a+b=1.

The invention provides a process for the preparation of a bismuth sodium titanate (BNT) compound of formula (I) wherein A is one or more of Bi, Na, Li, K, Mg, Ca, Sr, Ba, La, Al, Cu, Eu, Ag and Zn; B is one or more of Ti, Nb, Ta, Zr, Fe, Nd, Eu and Co; 0<x<0.8; 0<y<0.8; and −0.1<z<0.1; said process comprising spray pyrolysis of a solution comprising Bi ions, Na ions, Ti ions and, if present, metal (A) and/or metal (B) ions.

A composite structure including a conductor region that is configured from a first oxide, and an insulator region that is configured from a second oxide and that surrounds the conductor region, wherein the first oxide and the second oxide are in hetero structure with each other. A powder and a fired body each having such a composite structure are also preferable.

A composite structure including a conductor region that is configured from a first oxide, and an insulator region that is configured from a second oxide and that surrounds the conductor region, wherein the first oxide and the second oxide are in hetero structure with each other. A powder and a fired body each having such a composite structure are also preferable.

A process for preparing a porous ceramic body includes forming a green body with a mixture of ceramic material powder, binder material, and pore-forming particles. The process further includes extracting the binder material, decomposing the pore-forming particles, and removing residual organic materials from the green body at respective, progressively higher pre-firing temperatures. After these three stages, the green body is sintered at a still-higher temperature to form the porous ceramic body. Embodiments facilitate manufacturing and can render most or all surface grinding unnecessary, allowing electrode deposition directly onto substantially non-porous surfaces of the porous ceramic body that are naturally formed during sintering. Advantageously, the green body may be formed into net shape by injection molding the mixture that includes the pore-forming particles, and embodiments can result in porous ceramic bodies that are much thicker than currently available, with better structural integrity.