Phase Transformations in Lutetium Borides at Heating in Vacuum

Abstract:

The LuB₁₂ ® LuB₄ ® LuB₂ phase transformations on annealing in vacuum (T=(1400÷1800) K, p < 10^-2 Pa) are investigated with use of the parent single crystals. SEM and X-ray researches of the corresponding lutetium boride single crystals were carried out before and after their annealing. It is shown that the LuB₁₂ → LuB₄ phase transformation takes place in surface layer and transition region spreads inwards the single crystal bulk with time. According to the assessed Lu-B phase diagram the LuB₄ phase transformation into other individual phases is impossible, and at first it is shown that under corresponding conditions the LuB₄ → LuB₂ spontaneous phase transformation takes place both on the surface and in the LuB₄ single crystal bulk.

• Periodical: Solid State Phenomena (Volumes 172-174)
• Pages: 464-469
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.172-174.464
• Online since: June 2011
• Authors: Anatoliy Taran, Daniel Voronovich, Natalya Shitsevalova, Ganna Levchenko, Volodymyr Filipov, Sergiy Abashin
• Keywords: Boron Diffusion, Lamel, Lutetium Boride, Phase Transformation, Single Crystal

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