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Microstructural design of neodymium-doped lanthanum–magnesium hexaaluminate synthesized by aqueous sol–gel process
- Jana, P., Jayan, P. S., Mandal, S., Biswas, K.
- Journal of materials science 2015 v.50 no.1 pp. 344-353
- ceramics, magnesium, microstructure, neodymium, sol-gel processing, specific heat, temperature
- Aqueous sol–gel processing was used to synthesize neodymium-doped magnesium hexaaluminate (La₁₋ₓ Nd ₓ MgAl₁₁O₁₉; 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.