The composition according to the invention includes a perovskite of the formula LaMO.sub.3, where M is at least one element selected from among iron, aluminium or manganese, in the form of particles dispersed on an alumina or aluminium oxyhydroxide substrate, characterized in that after calcination at 700 C. for 4 hours, the perovskite is in the form of a pure crystallographic phase, and in that the size of the perovskite particles does not exceed 15 nm. The composition according to the invention can be used in the field of catalysis.

Embodiments of synthetic garnet materials having advantageous properties, especially for below resonance frequency applications, are disclosed herein. In particular, embodiments of the synthetic garnet materials can have high Curie temperatures and dielectric constants while maintaining low magnetization. These materials can be incorporated into isolators and circulators, such as for use in telecommunication base stations.

Provided is a non-stick coating including at least one functional decorative layer, including a pigment composition having a reversible variation of optical and/or colorimetric properties when the coating is subjected to a temperature variation between a cold temperature of 0 C. to 40 C. and a hot temperature of 80 C. to 400 C. The pigment composition includes at least one compound of formula Y.sub.(3-x)M.sub.xFe.sub.(5-y)Q.sub.yO.sub.12 in the form of particles, in which M is selected from the lanthanides, alkaline metals, alkaline-earth metals and metalloids with a degree of oxidation (DO) +3; Q is selected from the group made up of the lanthanides, non-metals with degree of oxidation +4, metals with DO +3 or +4, transition metals with DO +2 or +4, alkaline-earth metals and alkaline metals; and wherein x is between 0 and 0.3 and y is between 0 and 3.

A lithium-lanthanum-titanium oxide sintered material has a lithium ion conductivity 3.010.sup.4 Scm.sup.1 or more at a measuring temperature of 27 C., the material is described by one of general formulas (1a)La.sub.xLi.sub.2-3xTiO.sub.3-aSrTiO.sub.3, (1a)La.sub.xLi.sub.2-3xTiO.sub.3-aLa.sub.0.5K.sub.0.5TiO.sub.3, La.sub.xLi.sub.2-3xTi.sub.1-aM.sub.aO.sub.3-a, Sr.sub.x-1.5aLa.sub.aLi.sub.1.5-2xTi.sub.0.5Ta.sub.0.5O.sub.3 (0.55x0.59, 0a0.2, M=at least one of Fe or Ga), amount of Al contained is 0.35 mass % or less as Al.sub.2O.sub.3, amount of Si contained is 0.1 mass % or less as SiO.sub.2, and average particle diameter is 18 m or more.

Provided is a non-stick coating including at least one functional decorative layer, including a pigment composition having a reversible variation of optical and/or colorimetric properties when the coating is subjected to a temperature variation between a cold temperature of 0 C. to 40 C. and a hot temperature of 80 C. to 400 C. The pigment composition includes at least one compound of formula Y.sub.(3-x)M.sub.xFe.sub.(5-y)Q.sub.yO.sub.12 in the form of particles, in which M is selected from the lanthanides, alkaline metals, alkaline-earth metals and metalloids with a degree of oxidation (DO) +3; Q is selected from the group made up of the lanthanides, non-metals with degree of oxidation +4, metals with DO +3 or +4, transition metals with DO +2 or +4, alkaline-earth metals and alkaline metals; and wherein x is between 0 and 0.3 and y is between 0 and 3.

Devices and methods for below-resonance radio-frequency applications. In some embodiments, a ferrite device can include a modified yttrium iron garnet material in which bismuth occupies at least some of dodecahedral sites, and aluminum occupies at least some of tetrahedral sites.

A porous metal-oxide composite particle suitable for use as a oxygen reduction reaction or oxygen evolution reaction catalyst and sacrificial support based methods for making the same.

A sintered ferrite magnet comprising main phases of ferrite having a hexagonal M-type magnetoplumbite structure, first grain boundary phases existing between two main phases, and second grain boundary phases existing among three or more main phases, the second grain boundary phases being dispersed in its arbitrary cross section, and the second grain boundary phases having an average area of less than 0.2 m.sup.2, are produced by calcining, pulverizing, molding and sintering raw material powders having the general formula of Ca.sub.1-x-yLa.sub.xA.sub.yFe.sub.2n-zCo.sub.z, wherein 1xy, x, y and z and n representing a molar ratio are in desired ranges; 1.8% or less by mass of SiO.sub.2 and 2% or less by mass (as CaO) of CaCO.sub.3 being added to a calcined body after calcining and before molding; and the sintering step being conducted with a temperature-elevating speed of 1-4 C./minute in a range from 1100 C. to a sintering temperature, and a temperature-lowering speed of 6 C./minute or more in a range from the sintering temperature to 1100 C.

A method comprising the steps of mixing raw material powders to a composition comprising metal elements of Ca, La, Sr, Ba, Fe and Co, whose atomic ratios are represented by the general formula of Ca.sub.1-x-yLa.sub.x(Sr.sub.yBa.sub.1-y).sub.yFe.sub.2n-zCo.sub.z, wherein 1xy, x and y are values in a region defined by a coordinate a: (0.470, 0.297, 0.233), a coordinate b: (0.300, 0.392, 0.308), a coordinate c: (0.300, 0.300, 0.400), a coordinate d: (0.400, 0.200, 0.400) and a coordinate e: (0.470, 0.200, 0.330) in a ternary diagram of x, y, and 1xy, y and z, and n representing a molar ratio meet 0.5y1, 0.2z<0.25, and 5.2<n<5.6; calcining the raw material powder mixture; pulverizing the calcined body; molding the calcined powder; and sintering the resultant green body; 0.1% or more and less than 1.5% by mass of SiO.sub.2 being added to the raw material powder mixture, the calcined body or the calcined powder; and 0-2% by mass (as CaO) of CaCO.sub.3 being added to the calcined body or the calcined powder.

Provided is a cerium-zirconium-based composite oxide having an excellent OSC, high catalytic activity, and excellent heat resistance, and also provided is a method for producing the same. The cerium-zirconium-based composite oxide comprises cerium, zirconium, and a third element other than these elements. The third element is (a) a transition metal element or (b) at least one or more elements selected from the group consisting of rare earth elements and alkaline earth metal elements. After a heat treatment at 1,000 C. to 1,100 C. for 3 hours, (1) the composite oxide has a crystal structure containing a pyrochlore phase, (2) a value of {I111/(I111+I222)}100 is 1 or more, and (3) the composite oxide has an oxygen storage capacity at 600 C. of 0.05 mmol/g or more, and an oxygen storage capacity at 750 C. of 0.3 mmol/g or more.