Thermal Instability of Holmium and Thulium Dodecaborides in Vacuum

Daniil Voronovych; Anatoliy Taran; Natalya Shitsevalova; Ganna Levchenko; Volodymyr Filipov

doi:10.4028/www.scientific.net/SSP.257.152

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HomeSolid State PhenomenaSolid State Phenomena Vol. 257Thermal Instability of Holmium and Thulium...

Thermal Instability of Holmium and Thulium Dodecaborides in Vacuum

Abstract:

There are studied the HoB₁₂ → HoB₄ and TmB₁₂ → TmB₄ phase transformations on annealing of the corresponding dodecaborides single crystals up to 1814 K in vacuum . It is shown that at p < 10^-4 Pa the HoB₁₂ → HoB₄ phase transformation takes place on the HoB₁₂ surface because of preferential boron evaporation from dislocations outcrops. TmB₁₂ evaporates congruently and at p < 10^-4 Pa its phase composition remains unchanged. At pressure p ≥ 10^-2 Pa intensification of surface bombardment by ions of the residual gases and evaporated boron ions takes place. The ion bombardment is a contributing factor of the HoB₁₂ → HoB₄ phase transformation and determinating factor of the TmB₁₂ → TmB₄ one.

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Solid State Phenomena (Volume 257)

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152-155

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https://doi.org/10.4028/www.scientific.net/SSP.257.152

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Online since:

October 2016

Authors:

Daniil Voronovych*, Anatoliy Taran, Natalya Shitsevalova, Ganna Levchenko, Volodymyr Filipov

Keywords:

Dodecaboride, Ion Bombardment, Phase Transformation, Single Crystal, Tetraboride

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