Wj Gaseous Metaborates . Iii . the Beryllium Oxide - Boron Oxide System
نویسندگان
چکیده
Gaseous beryllium metaborate, Be(B02)2,has been identified mass spectrometrically in the vapor above the beryllium-boron-oxygen system. A st-jdy of this system by differential thermal analysis» and Knudsen effusion using a vacuum balance and mass spectrometer, showt-i solid DeoBo0, to be the only condensed mixed oxide phase present with a melting point of 1495 ± 5C. The following thermodynamic values were obtained for the formation of gaseous beryllium metaborate from beryllium oxide and gaseous boron oxide: BeO(c) + B203(g) = Be(B02)2(g) ^1500 ~ 22 ± 5 fccal/mole ^S1500 » 6 ± 1 eu/mole For the formaMon of solid Be.B„0, from the condensed oxides, 3BeO(c) + B203U) Be^O^c) AH » -23 ± 5 kcal/mole AS « -13 ± 2 eu/mole The metal-arion bond strengths in the gaseous lithium and beryllium metaborates show the same relation to each other as the bond strengths in the correspohding chlorides, thus further ;onfirming the pseudohalide character of the gaseous metaborates. attljttt B-litrirlnr. * This work was supported by the U.S. Air Force Oftice of Scientific Researca, Contract No. AF A9(638)-1171, ARPA Order No. 315-62 and by the U.S. Army Research Office, Contract No. DA-i9-020-ORD-5584, ARPA Order No. 40-62, with funds provided by the Advanced Research Projects Agency.
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