Synthesis of LaB 6 –ZrB 2  Powder Mixture by Borothermal Reduction of La(OH) 3  and ZrO(OH) 2  Coprecipitated in Boron Suspension

D. D. Nesmelov; O. A. Kozhevnikov; S. V. Vikhman; E. S. Novoselov; I. V. Shatalkina

doi:10.1007/s11148-019-00373-3

Synthesis of LaB₆–ZrB₂ Powder Mixture by Borothermal Reduction of La(OH)₃ and ZrO(OH)₂ Coprecipitated in Boron Suspension

Authors: Nesmelov D.D.¹, Kozhevnikov O.A.¹, Vikhman S.V.¹, Novoselov E.S.¹, Shatalkina I.V.¹
Affiliations:
1. Prometei CRSI of Structural Materials, Kurchatov Institute SRC
Issue: Vol 60, No 4 (2019)
Pages: 389-393
Section: Article
URL: https://journal-vniispk.ru/1083-4877/article/view/249344
DOI: https://doi.org/10.1007/s11148-019-00373-3
ID: 249344

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Abstract

Eutectic LaB₆–ZrB₂ powder was synthesized by borothermal reduction of an La(OH)₃–ZrO(OH)₂ mixture under vacuum with isothermal curing at 1200 – 1600°C. The mixture of hydroxides was prepared via coprecipitation from aqueous solutions of La and Zr nitrates in a suspension of amorphous boron. The effect of an excess of B on the phase and elemental compositions of the boride mixture was studied. The particle size of the obtained powders depended on the synthesis temperature.