An antimicrobial material including a substrate and an antimicrobial mixed metal oxide, mixed metal sulfide, or mixed metal oxysulfide in and/or on the substrate is described, as well as antimicrobial coating materials and coatings formed therefrom. The antimicrobial material may be constituted in an antimicrobial surface of a surface-presenting substrate, to combat transmission and spread of microbial disease, e.g., disease mediated by microbial pathogens such as bacteria, viruses, and fungi. Antimicrobial mixed metal oxide, mixed metal sulfide, or mixed metal oxysulfide as described may be contacted with microorganisms to effect inactivation thereof.

An NTC compound, a thermistor and a method for producing a thermistor are disclosed. In an embodiment an NTC compound includes a ceramic material of a Mn—Ni—O system as a main constituent, wherein the Mn—Ni—O system has a general composition Ni.sub.xMn.sub.2O.sub.4-δ, wherein y corresponds to a molar fraction of Ni of a total metal content of the ceramic material of the Mn—Ni—O system, which is defined as c(Ni):(c(Ni)+c(Mn)), and wherein the following applies: 0.500<x<0.610 and 0.197<y<0.240.

A ceramic material, a varistor and methods for forming a ceramic material and a varistor are disclosed. In an embodiment, a ceramic material includes ZnO as a main component and additives selected from the group consisting of an Al.sup.3+-containing solution, a Ba.sup.2+-containing solution, and at least one compound containing a metal element, wherein the metal element is selected from the group consisting of Bi, Sb, Co, Mn, Ni, Y, and Cr.

Composite materials with thermoelectric properties and devices made from such materials are described. The thermoelectric composite material may comprise a metal oxide material and graphene or modified graphene. It has been found that the addition of graphene or modified graphene to thermoelectric metal oxide materials increases ZT. It has further been found that the ZT of the metal oxide becomes effective over a broader temperature range and at lower temperatures.

A ceramic material, a component, and a method for producing a component are disclosed. In an embodiment a ceramic material includes a structure based on a system selected from the group consisting of NiCoMnO, NiMnO and CoMnO, and at least one dopant selected from lanthanides, wherein the ceramic material has a negative temperature coefficient of an electrical resistance.

In one aspect, the disclosure relates to thermoelectric ceramic oxide compositions comprising a CaMnO.sub.3 ceramic. In a further aspect, the disclosed thermoelectric ceramic oxide compositions can dramatically increase the energy conversion efficiency of thermoelectric through a combination of modifying the chemistry of precursor materials, and simultaneously introducing a metal oxide liquid phase during sintering. In a further aspect, the present disclosure pertains to thermoelectric ceramic oxide compositions comprising a metal doped CaMnO.sub.3 having with a metal oxide grain boundary phase; wherein the metal is selected from group 13, group 14, group 15, group 16, or a rare earth element. In a still further aspect, the disclosure relates to methods for making the thermoelectric ceramic oxide materials. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

A ceramic member includes a matrix phase of a perovskite compound including La, Ca, and Mn, and a heterophase including Mn and O as main components, wherein crystal grains of the perovskite compound have an average grain size of about 2.5 m or more and about 6.4 m or less.

A ceramic member includes a perovskite compound including La, Ca, Mn, and Ti as main components, wherein the amount of Ti is about 5 parts by mole or more and about 20 parts by mole or less, the amount of Ca is about 10 parts by mole or more and about 27 parts by mole or less, and the total amount of La and Ca is about 85 parts by mole or more and about 97 parts by mole or less based on the total amount of Mn and Ti of 100 parts by mole.

A method is described of producing a catalyst-containing composite oxygen ion membrane and a catalyst-containing composite oxygen ion membrane in which a porous fuel oxidation layer and a dense separation layer and optionally, a porous surface exchange layer are formed on a porous support from mixtures of (Ln.sub.1xA.sub.x).sub.wCr.sub.1yB.sub.yO.sub.3 and a doped zirconia. Adding certain catalyst metals into the fuel oxidation layer not only enhances the initial oxygen flux, but also reduces the degradation rate of the oxygen flux over long-term operation. One of the possible reasons for the improved flux and stability is that the addition of the catalyst metal reduces the chemical reaction between the (Ln.sub.1xA.sub.x).sub.wCr.sub.1yB.sub.yO.sub.3 and the zirconia phases during membrane fabrication and operation, as indicated by the X-ray diffraction results.

Disclosed is a method for manufacturing, by stereolithography, a green part made of a ceramic or metallic material. Layers based on a curable composition including: the ceramic or metallic material formed by at least one ceramic or metallic powder, respectively, and an organic part including at least one monomer and/or oligomer and at least one initiator for the polymerization of the one or more monomers and/or oligomers, are successively cured by the polymerization according to a pattern defined for each layer. The first layer formed on a construction platform, each other layer being formed and then cured on the preceding layer. As an initiator, at least one thermal initiator is used capable of generating the initiation of a thermal polymerization by the thermal energy released by the ceramic or metallic material, respectively, during exposure to at least one irradiation source chosen from UV, visible or IR irradiation sources.