About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
13th Symposium on Green and Sustainable Technologies for Materials Manufacturing and Processing
|
Presentation Title |
Single Source Precursors for Lanthanum Phosphates |
Author(s) |
Allen Apblett, Mha Albqmi |
On-Site Speaker (Planned) |
Allen Apblett |
Abstract Scope |
The rich diversity of compounds in the La2O3/P2O5 system has led to numerous applications. Lanthanum phosphates suitably doped with other metal ions possess useful optical properties leading to their application in lasers, phosphors, and luminescent materials. When exposed to water vapor, several lanthanum phosphates become proton conductors that can be used in fuel cells and hydrogen separators. Lanthanum phosphate films are hydrophobic and are inert and non-wettable by molten metals and molten salts, leading to applications as coatings that prevent hot corrosion. It was found that reaction of lanthanum salts of bis-2-ethylhexylphosphate or appropriate mixtures of bis-2-ethylhexylphosphate and 2-ethylhexanoate could be used to produce single-source precursors for LaPO4, La2P4O13, and LaP3O9. The organic groups are removed readily by heating in air above 300˚C to form amorphous lanthanum phosphate glasses that crystalize as the target compounds at higher temperature, with exception of the metastable La2P4O13 that phase-separates into LaPO4 and LaP3O9. |