Abstract: An elastomeric mounting comprises a body of elastomeric material having end regions the surfaces which are bonded to respective confronting surfaces of a pair of rigid end members for compression therebetween. A first of the rigid end members (32) extends radially outwardly from a longitudinal compression axis (19) of the mounting to lie beyond the bonded interface (35). The first end member has outwards of the bonded interface an abutment face (34) which is contacted by the elastomeric body when subject to compression loading, and a discontinuity is defined by the first rigid end member whereby the interface and abutment face depart from a wholly co-planar form.

Abstract: Chemically pure mercuric iodide is purified to form detector-grade mercuric iodide and mercuric iodide semi-conductor crystals by vaporization in an inert gas stream containing deliberate addition of oxygen and iodine vapor and crystallizing the vaporized mercuric iodide in order to remove undesired metallic iodides and organic residues, followed by the elimination of undesired oxides of mercury by the revaporization in a second inert gas stream in the presence of reducing vapors such as carbon monoxide, hydrogen iodide or iodine and recrystallization to produce detector-grade mercuric iodide, and crystal growth in such a reducing atmosphere produces semi-conductor crystals.

Abstract: Silicon doping of GaAs epitaxial layers grown using the AsCl.sub.3 /H.sub.2 /GaAs:Ga CVD system is accomplished using AsCl.sub.3 :SiCl.sub.4 liquid doping solutions. These solutions can be readily prepared with reproducible compositions and provide excellent doping control. Fine adjustments in the doping level can be achieved by adjusting the H.sub.2 flow rate and by varying the temperature of the doping solution. Doping levels may range from about 5.times.10.sup.15 to 5.times.10.sup.19 cm.sup.-3 by adjusting the mole fraction of SiCl.sub.4 in the doping solution and the H.sub.2 flow rate to change the mole fraction of P.sub.HCl. The epitaxial layers doped using this technique have excellent room temperature and liquid nitrogen mobilities for electron concentrations between 1.times.10.sup.16 cm.sup.-3 and 8.times.10.sup.18 cm.sup.-3. This doping method is particularly useful for the growth of GaAs epitaxial layers for FET devices.

Abstract: A polycrystalline article is densified to provide either a nonporous body or a body with controlled interconnected porosity. A mixture of fine powders of the polycrystalline material and a sintering aid is compacted and outgassed under reduced pressure. The outgassed compact is then subjected to a permeation anneal step in which it is heated in a closed chamber to a temperature sufficient to form a liquid of the sintering aid, but under pressure conditions which inhibit evaporation of the sintering aid. The sintering aid can then be leached out to provide a densified article having interconnected porosity. Alternatively, the sintering aid can be leached out at elevated temperature, further densifying the compact to form a substantially nonporous body. Alternatively, the sintering aid can be removed by subjecting the densified article to an evaporation anneal step in which the article is heated to evaporate the sintering aid, further densifying the compact to form a substantially nonporous article.

Abstract: A process for the oxidation of nitric oxide to nitrogen dioxide in the presence of elemental nitrogen with minimal oxidation thereof which comprises combining the nitric oxide with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of nitric oxide to nitrogen dioxide and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 100.degree. C. and about 400.degree. C.;W.sub.k X.sub.n J(l-k-n).sup.ZO (3.+-.m) wherein W is Zirconium, Tin or Thorium or mixtures thereof; X is an alkaline earth metal or mixture thereof; J is scandium, yttrium; a rare-earth element or mixture thereof; Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3; k is a number having a value between 0 and about 0.1; m is a number having a value of from 0 to about 0.26; and n is a number having a value from 0 to about 0.

Abstract: A polycrystalline article is densified to provide either a nonporous body or a body with controlled interconnected porosity. A mixture of fine powders of the polycrystalline material and a sintering aid is compacted and outgassed under reduced pressure. The outgassed compact is then subjected to a permeation anneal step in which it is heated in a closed chamber to a temperature sufficient to form a liquid of the sintering aid, but under pressure conditions which inhibit evaporation of the sintering aid. The sintering aid can then be leached out to provide a densified article having interconnected porosity. Alternatively, the sintering aid can be leached out at elevated temperature, further densifying the compact to form a substantially nonporous body. Alternatively, the sintering aid can be removed by subjecting the densified article to an evaporation anneal step in which the article is heated to evaporate the sintering aid, further densifying the compact to form a substantially nonporous article.

Abstract: A process for the oxidation of sulphur dioxide to sulfur trioxide in the presence of elemental nitrogen with minimal oxidation thereof which comprises combining the sulfur dioxide with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of sulfur dioxide to sulfur trioxide and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 120.degree. C and about 800.degree.;W.sub.k X.sub.n J(1-k-n).sup.ZO (3.+-.m)whereinW is Zirconium, Tin or Thorium or mixtures thereof;X is an alkaline earth metal or mixture thereof;J is scandium, ytrrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value between 0 and about 0.1;m is a number having a value of from 0 to about 0.26; andn is a number having a value from 0 to about 0.

Abstract: A process for the oxidation of hydrogen sulfide to sulfur trioxide in the presence of elemental nitrogen with minimal oxidation thereof which comprises combining the hydrogen sulfide with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of hydrogen sulfide to sulfur trioxide and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 100.degree. C and about 700.degree. C.;w.sub.k X.sub.n J(1-k-n).sup.ZO (3.+-.m)whereinW is Zirconium, Tin or Thorium or mixtures thereof;X is an alkaline earth metal or mixture thereof;J is scandium, yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series orA mixture thereof, at least 0.01% of said metalHaving an oxidation state other than +3;k is a number having a value between 0 and about 0.1;m is a number having a value of from 0 to 0.26; andn is a number having a value from 0 to about 0.

Abstract: A process for the oxidation of carbon monoxide to carbon dioxide in the presence of elemental nitrogen with minimal oxidation thereof which comprises combining the carbon monoxide with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of carbon monoxide to carbon dioxide and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 100.degree. C and about 1,000.degree. C;w.sub.k X.sub.n J(1-k-n).sup.ZO (3.+-.m)WhereinW is Zirconium, Tin or Thorium or mixtures thereof;X is an alkaline earth metal or mixture thereof;J is scandium, ytrrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value between 0 and about 0.1;m is a number having a value of from 0 to about 0.26; andn is a number having a value from 0 to about 0.

Abstract: A process for the oxidation of ammonia to nitrous oxide in the presence of elemental nitrogen with minimal oxidation thereof which comprises combining the ammonia with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of ammonia to nitrous oxide and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 100.degree. C and about 400.degree. C.;w.sub.k X.sub.n J(1-K-n).sup.ZO (3.+-.m)WhereinW is Zirconium, Tin or Thorium or mixtures thereof;X is an alkaline earth metal or mixture thereof;J is scandium, yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value between 0 and about 0.1;m is a number having a value of from 0 to about 0.26; andn is a number having a value from 0 to about 0.

Abstract: A process for the oxidation of hydrogen to water in the presence of elemental nitrogen with minimal oxidation thereof which comprises combining the hydrogen with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of hydrogen to water and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 100.degree. C and about 1,000.degree. C;w.sub.k X.sub.n J(1-k-n).sup.ZO (3.+-.m)WhereinW is Zirconium, Tin or Thorium or mixtures thereof;X is an alkaline earth metal or mixture thereof;J is scandium, yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series of a mixture thereof, at least 0.01% of said metal having an oxidation state other then +3;k is a number having a value between 0 and about 0.1;m is a number having a value of from 0 to about 0.26; andn is a number having a value from 0 to about 0.

Abstract: A process for the selective oxidation of ammonia to nitric oxide in the presence of elemental nitrogen with minimal oxidation thereof, which comprises combining the ammonia with a predetermined amount of oxygen containing gas to give at least 1% stoichiometric excess of oxygen for the oxidation of the ammonia to nitric oxide; and passing the resulting mixture over a ceramic catalyst of the following empirical formula at an elevated temperature:W.sub.k X.sub.n J.sub.(1-k-n) ZO.sub.(3.+-.m)whereinW is Zirconium, Tin or Thorium or mixtures thereof;X is an alkaline earth metal or mixture thereof;J is Scandium, Yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value between 0 and about 0.1;m is a number having a value of from 0 to about 0.26; andn is a number having a value from 0 to about 0.

Abstract: A process for the oxidation of carbon monoxide to carbon dioxide with an inorganic oxidizing agent selected from the group consisting of water, nitric oxide and sulfur dioxide, which comprises combining the carbon monoxide with a predetermined amount of said oxidizing agent to give at least a stoichiometric amount of the oxidizing agent for the oxidation of the carbon monoxide to carbon dioxide, and passing the mixture over a novel ceramic catalyst at an elevated temperature.

Abstract: A process for the oxidation of hydrocarbons with the oxides of nitrogen which comprises combining a hydrocarbon with a predetermined amount of the oxides of nitrogen to produce carbon dioxide, nitrogen gas and water and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a predetermined elevated temperature above about 200.degree. C.:W.sub.k" X.sub.n' J.sub.(1-k"-n') ZO(.sub.3.+-.m)wherein:W is zirconium, tin or thorium or mixture thereof;X is alkaline earth metal or mixture thereof;J is scandium, yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value of between 0 and about 0.1;m' is a number having a value of from 0 to about 0.26, provided m' has a value other than 0 when n has a value of 0; andn is a number having a value from 0 to about 0.

Abstract: A process for the oxidation of ammonia to hydrogen cyanide which comprises combining ammonia with a predetermined amount of oxygen and methane to produce hydrogen cyanide and water and passing the resulting mixture over a ceramic catalyst of the following empirical formula at a temperature between about 700.degree. and 1100.degree. C.:W.sub.k X.sub.n J.sub.(1-k-n) ZO.sub.(3.+-.m')Wherein:W is zirconium, tin or thorium or mixture thereof;X is an alkaline earth metal or mixture thereof;J is scandium, yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value of between 0 and about 0.1;m' is a number having a value of from 0 to about 0.26, provided m' has a value other than 0 when n has a value of 0; andn is a number having a value from 0 to about 0.51, provided when n has a value of 0, k has a value of between 0 and about 0.05.

Abstract: A process for the oxidation of carbon monoxide to carbon dioxide with sulfur dioxide and water which comprises combining the carbon monoxide with a predetermined amount of sulfur dioxide and water to produce hydrogen sulfide and carbon dioxide; and passing the resulting mixture over a ceramic catalyst of the following empirical formula above about 200.degree. C.:w.sub.k X.sub.n J.sub.(1-k-n) ZO.sub.(3.+-.m')Wherein:W is zirconium, tin or thorium, or a mixture thereof;X is an alkaline earth metal or mixture thereof;J is scandium, yttrium, a rare-earth element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value of between 0 and about 0.1;m' is a number having a value of from 0 to about 0.25, provided m' has a value other than 0 when n has a value of 0; andn is a number having a value from 0 to about 0.51, provided when n has a value of 0, k has a value of between 0 and about 0.05.

Abstract: A method of burning a fossil fuel and air with the emmission of an exhaust gas consisting essentially of atmospheric gases, carbon dioxide and water vapor and essentially free of carbon monoxide, hydrocarbons and nitric oxide, which comprises burning the fossil fuel at a temperature between 1000.degree. C. and 1500.degree. C.

Abstract: A process for the oxidation of hydrogen sulfide with sulfur dioxide to produce sulfur which comprises combining the hydrogen sulfide with a one-half molar equivalent of sulfur dioxide and passing the hydrogen sulfide-sulfur dioxide mixture over a ceramic catalyst of the following formula at a temperature between about 100.degree. C. and about 800.degree. C.:w.sub.k X.sub.n J.sub.(l-k-n) ZO (3.+-.m)wherein: W is zirconium, tin or thorium, or a mixture thereof; X is an alkaline earth metal or mixture thereof; J is scandium, yttrium, a rare-earth element or mixture thereof; Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3; k is a number having a value of between 0 and about 0.01; m is a number having a value of from 0 to about 0.26; and n is a number having a value from 0 to about 0.51, provided when n has a value of 0, k has a value between 0 and about 0.05.

Abstract: A class of ceramic mixed oxide, nonstoichiometric electrically neutral, rare-earth-type catalyst containing rare-earth-type elements, elements of the first transition metal series and Zirconium, Tin or Thorium and optionally the alkaline earth metals. The catalyst has the following formula:W.sub.k X.sub.n Y.sub.(1-k-n) ZO.sub.(3.sub.+-m.sub.') (I)wherein:W is Zirconium, Tin or Thorium or mixture thereof;X is an alkaline earth metal or mixture thereof;J is a rare-earth-type element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;k is a number having a value of between 0 and about 0.1;m' is a number having a value of from 0 to about 0.26, provided m has a value other than 0 when n has a value of 0; andn is a number having a value from 0 to about 0.51, provided when n has a value of 0, k has a value of between 0 and about 0.05.

Abstract: A class of ceramic mixed oxide, nonstoichiometric electrically neutral rare-earth-type catalyst containing rare-earth-type elements and elements of the first transition metal series and optionally the alkaline earth metals. The catalyst has the following formula:X.sub.n Y.sub.(1.sub.-n) ZO.sub.(3<m) (I)wherein:X is an alkaline earth metal or mixture thereof;Y is a rare-earth-type element or mixture thereof;Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3;m is a number having a value of between 0 and about 0.11; andn is a number having a value from 0 to about 0.51.These mixed oxide catalysts can be used to catalytically oxidize low molecular weight inorganic compounds and elements, such as ammonia, carbon monoxide, hydrogen, sulfur dioxide, and hydrogen sulfide, with oxygen, or carbon monoxide with water, sulfur dioxide or nitric oxide.