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- Title
Microstructural design of neodymium-doped lanthanum-magnesium hexaaluminate synthesized by aqueous sol-gel process.
- Authors
Jana, P.; Jayan, P.; Mandal, S.; Biswas, K.
- Abstract
Aqueous sol-gel processing was used to synthesize neodymium-doped magnesium hexaaluminate (La1-xNdxMgAl11O19; x = 0, 0.3, 0.4, 0.5) ceramic powder and subsequently calcined at 1450 and 1600 °C for 2 h. Randomly grown platelets of lanthanum-magnesium hexaaluminate formed a porous interlocking structure. Presence of various percentages of neodymium oxide significantly modifies the porous interlocking microstructure into self-reinforced, card-house-like microstructure. Platelets of rare earth-rich magnesium hexaaluminate were grown preferentially more than the stoichiometric rare earth magnesium hexaaluminate at elevated temperature greater than 1450 °C. Rare earth-rich magnesium hexaaluminate platelets form the skeleton of a card-house structure and the tiny platelets of stoichiometric rare earth magnesium hexaaluminate fill the house. The specific heat capacities, micro-hardness, and fracture toughness were studied in details.
- Subjects
LANTHANUM compounds; SPINEL; SOL-gel processes; MICROSTRUCTURE; CERAMIC powders synthesis; NEODYMIUM; DOPING agents (Chemistry)
- Publication
Journal of Materials Science, 2015, Vol 50, Issue 1, p344
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-014-8593-5