Premium
Solubilities of Magnesia, Titania, and Magnesium Titanate in Aluminum Oxide
Author(s) -
ROY SALIL K.,
COBLE ROBERT L.
Publication year - 1968
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1966.tb13316.x-i1
Subject(s) - solubility , magnesium , titanium , hydrogen , aluminium , analytical chemistry (journal) , mass fraction , titanate , materials science , ion , oxide , inorganic chemistry , chemistry , nuclear chemistry , mineralogy , metallurgy , ceramic , organic chemistry , chromatography , composite material
On heat treatment in air the solubility of MgO or TiO 2 , in Al 2 3 is too small to detect by lattice parameter shifts. The solubility of MgTiO 3 in Al 2 O 3 in air increased to the measured values, expressed as atomic fractions Mg:A1or Ti:A1of0.82 × lo‐ 2 , 1.43 × 10 ‐2 , and 1.75 × 10 ‐2 at 1250°, 1650°, and 1850°C, respectively. In 1 atm hydrogen the TiO 2 solubility expressed as the atomic fraction Ti:A1 is 0.55 × lo ‐2 , 0.75 × 10W 2 , 1.15 × 10 ‐2 , and 1.50 × 10 p2 at 1400°, 1500°, 1600°, and 1700°C, respectively. The increased solubility in H 2 was attributed to reduction of the titanium ion. The solubility of MgO in A1 2 O 3 in vacuum (0.3μ) expressed as the atomic fraction Mg:A1 was measured as 1.10 × loW 4 , 3.00 × 10” 4 , 6.80 × 10– 4 , and 1.40 × 10 ‐3 at 1530°, 1630°, 1730°, and 183O°C, respectively. These contents did not cause an observable change in lattice parameter, but a slight change was observed when MgO was dissolved in A1 2 O 3 in a hydrogen atmosphere.