caa a22 4500 388022906 CHVBK 20180307124929.0 cr unu---uuuuu 161130e199805 xx s 000 0 eng 10.1557/JMR.1998.0182 doi S0884291400044186 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0182 The oxidative transformation of solid, barium-metal-bearing precursors into monolithic celsian with a retention of shape, dimensions, and relative density [Elektronische Daten] The conversion of Ba-Al2O3 -Si-SiO2, Ba-Al-Al2O3 -SiO2, and Ba-Sr-Al-Al2O3 -SiO2 precursors into monolithic, monoclinic celsian has been examined. The relative amounts of metal and oxide in each type of precursor were adjusted so that the overall stoichiometry and molar volume were similar to those of the desired product, celsian. Metal + oxide mixtures were mechanically alloyed and then uniaxially pressed to yield 84-92% dense precursor disks. The precursors were converted into celsian by exposure to a series of heat treatments from 300-1500 °C in oxygen-bearing gases. Differences and similarities in the phase evolution of the various precursors are discussed. Celsian disks were produced that retained the precursor shape, dimensions, and relative (% theoretical) density. Copyright © Materials Research Society 1998 Allameh Seyed M. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 Sandhage Kenneth H. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 Journal of Materials Research Cambridge University Press 13/5(1998-05), 1271-1285 0884-2914 13:5<1271 1998 13 JMR https://doi.org/10.1557/JMR.1998.0182 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0182 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Allameh Seyed M. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 NATIONALLICENCE 700 1- Sandhage Kenneth H. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/5(1998-05), 1271-1285 0884-2914 13:5<1271 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge