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Microstructural design of neodymium-doped lanthanum–magnesium hexaaluminate synthesized by aqueous sol–gel process

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Abstract

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.

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Acknowledgements

The authors would like to thank M/s. Carborundum Universal Limited, India for sponsoring this research work. Technical staffs of Central Research Facility (CRF) of Indian Institute of Technology, Kharagpur and Sophisticated Analysis and Instrument Facility (SAIF), Cochin are sincerely acknowledged for their extended support during SEM, FTIR, and XRD analysis.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302, India

    P. Jana & K. Biswas

  2. Electro Minerals Division, Carborundum Universal Limited, Kochi, 683109, India

    P. Jana & P. S. Jayan

  3. Industrial Ceramics Division, Carborundum Universal Limited, Hosur, 635126, India

    S. Mandal

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  1. P. Jana
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Correspondence to P. Jana.

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Jana, P., Jayan, P.S., Mandal, S. et al. Microstructural design of neodymium-doped lanthanum–magnesium hexaaluminate synthesized by aqueous sol–gel process. J Mater Sci 50, 344–353 (2015). https://doi.org/10.1007/s10853-014-8593-5

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