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Preparation and investigation of rare earth magnesium hexaaluminate solid solutions

Journal of Contemporary Physics (Armenian Academy of Sciences) volume 49, pages 220–227 (2014)Cite this article

An Erratum to this article was published on 01 April 2015

Abstract

Conditions of preparation, by the method of solid state reactions, of rare-earth hexaaluminates RE1−x−yMxM’yMgAl11O19 (RE = La, Sm; M, Mt’ = Gd, Yb, Lu, Y, Sc; x, y = 0, 0.15, 0.3), were investigated. For a number of compositions, high-degree single-phase products were obtained applying multi-step heat treatments in Ar/H2 atmosphere at 1650–1690°C. Intense (107) and (114) diffraction lines typical for the hexaaluminate phase have been observed in X-ray diffraction patterns. Studies of microstructure and of elemental composition showed that magnesium deficiency on the sample surface may reach some 20%, while composition in the bulk is more homogeneous and close to stoichiometric. Our estimations of structural homogeneity and thermal conductivity show that lanthanum hexaaluminates La1−x−yMxM’yMgAl11O19 with pair additives Gd-Yb, Gd-Y, Y-Yb, Y-Lu, Y-Sc (x = y = 0.15) and samarium hexaaluminates Sm1−x−yMxM’yMgAl11O19 with pair additives Gd-Yb, Y-Yb (x = y = 0.15), as well as Sm0.7Yb0.3MgAl11O19, may present interest as thermal barrier coatings.

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Authors and Affiliations

  1. Institute for Physical Research, NAS of Armenia, Ashtarak, Armenia

    K. L. Ovanesyan, A. S. Kuzanyan, G. R. Badalyan, A. V. Yeganyan, R. V. Sargsyan, V. S. Kuzanyan & A. G. Petrosyan

  2. General Department of Applied Sciences, Technological Educational Institute of Sterea Ellada, GR34400, Psahna Evias, Chalkida, Greece

    V. S. Stathopoulos

Authors
  1. K. L. Ovanesyan
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  2. A. S. Kuzanyan
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  3. G. R. Badalyan
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  4. A. V. Yeganyan
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  5. R. V. Sargsyan
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  6. V. S. Kuzanyan
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  7. A. G. Petrosyan
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  8. V. S. Stathopoulos
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Corresponding author

Correspondence to A. S. Kuzanyan.

Additional information

Original Russian Text © K.L. Ovanesyan, A.S. Kuzanyan, G.R. Badalyan, A.V. Yeganyan, R.V. Sargsyan, V.S. Kuzanyan, A.G. Petrosyan, V.S. Stathopoulos, 2014, published in Izvestiya NAN Armenii, Fizika, 2014, Vol. 49, No. 5, pp. 342–352.

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Ovanesyan, K.L., Kuzanyan, A.S., Badalyan, G.R. et al. Preparation and investigation of rare earth magnesium hexaaluminate solid solutions. J. Contemp. Phys. 49, 220–227 (2014). https://doi.org/10.3103/S1068337214050065

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  • DOI: https://doi.org/10.3103/S1068337214050065

Keywords

  • rare earth hexaaluminates
  • solid state reactions
  • thermal conductivity