Abstract: A crystal material represented by a general formula (1): (Gd1-x-y-zLaxMEyREz)2MM2O7?? (1), where ME is at least one selected from Y, Yb, Sc, and Lu; RE is Ce or Pr; MM is at least one selected from Si and Ge; and ranges of x, y, and z are represented by the following (i): (i) 0.0?x+y+z<1.0, 0.05?x+z<1.0, 0.0?y<1.0, and 0.0001?z<0.05 (where, when RE is Ce, y=0 is an exception).

Abstract: A crystal material represented by a general formula (1): (Gd1-x-y-zLaxMEyREz)2MM2O7 (1), where ME is at least one selected from Y, Yb, Sc, and Lu; RE is Ce or Pr; MM is at least one selected from Si and Ge; and ranges of x, y, and z are represented by the following (i): (i) 0.0?x+y+z<1.0, 0.05?x+z<1.0, 0.0?y<1.0, and 0.0001?z<0.05 (where, when RE is Ce, y=0 is an exception).

Abstract: A process for producing a heat-resistant compound, which comprises adding a diamine to an organic solvent-soluble metallosiloxane compound whose main chain consists of siloxane bonds --Si--O-- and metalloxane bonds --M--O-- wherein M represents at least one element selected from the group consisting of Ti, Zr, V, P, Al, Fe, Cr, Co, Ni, Ge, Sn, As, Mg, Pb and Sb, and heating the mixture to 50.degree. to 450.degree. C. in the presence or absence of an organic solvent.

Abstract: A process for producing a heat-resistant and moisture-resistant polyborometallosiloxane, which comprises adding a metal compound and a compound capable of easily forming a complex with the metal compound to an organoborosiloxane, the metal in said metal compound being at least one member of the group consisting of Ti, Zr, V, P, Al, Fe, Cr, Co, Ni, Ge, Sn, As, Mg, Pb and Sb; and heating the resulting mixture to a temperature of 550.degree. C. or lower to bond the metal atom to the silicon atom and/or the boron atom through an oxygen atom.

Abstract: An organometallic polymer of which the main-chain skeleton consists of a Si-CH.sub.2 bond and a V-O bond and which partly contains a vanadiosiloxane bond, the ratio of the number of silicon atoms to that of vanadium atoms being in the range of from 3:1 to 1000:1, the side-chain group directly bonded to the silicon atom being selected from the group consisting of hydrogen, methyl, ethyl and phenyl, and the vanadium atom being bonded to the silicon atom through an oxygen atom with substantially no side-chain organic group present which is directly bonded to the vanadium atom.

Abstract: A polyvanadiosiloxane being a polymer of which the main chain skeleton consists of Si-O bonds and V-O bonds, characterized by side chains directly attached to the silicon atom being at least one organic group selected from the group consisting of a lower alkyl group, phenyl group, fluoroalkyl group, nitrile group and vinyl group, the vanadium atom being attached to the silicon atom through the oxygen atom and no organic side chain group directly attached to the vanadium atom being present in substance; and a process for the production of a polyvanadiosiloxane which comprises reacting an oily polysiloxane having the main chain skeleton consisting of units of ##STR1## wherein R.sub.1 and R.sub.2 may be the same or different and stand for a lower alkyl group, phenyl group, fluoroalkyl group, nitrile group or vinyl group, and a vanadium compound by heating at a temperature of 450.degree. C. or less under conditions capable of forming a complex of the vanadium compound.

Abstract: A process for producing a thermal-resistant ceramic fired body is disclos As an additive for ceramic powder is used at least one specified organosilicon polymer selected from the group consisting of [I] organopolysiloxanes, [II] organosiloxane copolymers, [III] polycarbosiloxanes and [IV] nitrogen-containing organosilicon polymers.

Abstract: This invention relates to a process for producing crystallized glass having superior mechanical properties and thermal properties, which comprises (1) coating glass in the form of a powder or molded article with an organometallic polymer, said polymer being soluble in an organic solvent and having a skeleton comprising (a) titanoxane linkages --Ti--O-- or zirconoxane linkages --Zr--O-- or both and (b) siloxane linkages --Si--O-- in which most of the silicon atoms have as a side chain at least one organic group selected from alkyl and phenyl groups, and optionally (c) boroxane linkages --B--O-- or aluminoxane linkages --Al--O-- or both; and (2) firing the resulting polymer-coated glass in an oxidizing atmosphere to crystallize at least a part of the glass. This invention also pertains to a process for producing a ceramics-crystallized glass composite article using the aforesaid crystallized glass.

Abstract: A process for producing a corrosion-, heat- and oxidation-resistant shaped rticle which comprises coating a shaped article composed of at least one material selected from metals, carbonaceous substances and ceramics with a coating composition comprising a semi-inorganic compound, and heat-treating the coated article, said semi-inorganic compound being at least one polymer selected from the group consisting of polycarbosilanes and polycarbosiloxanes.

Abstract: A method for producing a corrosion-, heat- and oxidation-resistant material hich comprises coating a substrate composed of at least one material selected from metals, carbonaceous substances and ceramics with a semi-inorganic compound, and heat-treating the coated substrate; said semi-inorganic compound being either(1) a modified organoborosiloxane compound obtained by reacting an organoborosiloxane compound with at least one organic compound selected from the group consisting of polyhydric aliphatic alcohols, aromatic alcohols, phenols and aromatic carboxylic acid at a temperature of from 250.degree. to 450.degree.

Abstract: A process for producing a heat-resistant ceramic sintered body, which comses preparing polycarbosilane partly containing siloxane bonds by adding 0.01 to 15% by weight of polyborosiloxane containing phenyl groups in at least a part of the side chains of Si and having a skeletal structure composed of B, Si and O to a polysilane having the structure ##STR1## wherein n is at least 3, and R.sub.1 and R.sub.2, independently from each other, represent methyl, ethyl, phenyl or hydrogen, and heating the polymer mixture in an atmosphere inert to the reaction thereby polymerizing it; mixing said polycarbosilane with a ceramic powder composed of at least one member selected from the group consisting of oxides, carbides, nitrides, borides and silicides; shaping the resulting mixture; and simultaneously with, or after, the shaping of the mixture, sintering the mixture at a temperature of from 800.degree. C. to 2,000.degree. C.

Abstract: A heat-resistant semi-inorganic compound useful as a material for various at-resistant materials is produced by reacting an organoborosiloxane compound with at least one of aliphatic polyhydric alcohols, aromatic alcohols, phenols and aromatic carboxylic acids at 250.degree. to 450.degree. C. in an inert atmosphere.

Abstract: Novel borosiloxane polymers are produced by heating at least one of a boric cid compound with phenylsilane to effect polycondensation reaction.

Abstract: Heat resistant and super hard composite materials are produced by mixing more than 60% by weight of an organosilicon high molecular weight compound, the main skeleton components of which are silicon and carbon or an organosilicon high molecular weight compound, the main skeleton components of which are silicon and carbon and which contains foreign elements other than silicon, carbon, hydrogen and oxygen with not less than 40% by weight of metal material powders consisting mainly of at least one metal element, molding the mixture into a shaped article and baking the shaped article under a non-oxidizing atmosphere at a temperature of lower than the semi-melting point of the above described metal powders.

Abstract: Silicon carbide sintered moldings having a high flexural strength and various excellent properties are produced by mixing SiC powders with a binder of organosilicon low molecular weight compounds or organosilicon high molecular weight compounds, molding the mixture into a desired shape, heating the molding at a high temperature to form SiC sintered molding, impregnating the SiC sintered molding with the above described organosilicon compound and heating the impregnated SiC sintered molding, if necessary, said impregnation and heat treatment being repeated two or more times.