Crystal Growth and some Properties of Tm(Al_1-xMo_x)B₄ Synthesized by Al-Flux

Abstract:

Crystals of the solid solution Tm(Al_1-xMo_x)B₄ (x = 0.002 - 0.050) were grown from Tm₂O₃, metal Mo and crystalline boron powders as starting materials under an Ar atmosphere at 1773 K for 5 h. Tm(Al_1-xMo_x)B₄ crystals were obtained as a single phase in the case of Al_1-xMo_x flux (x = 0.005 and 0.010). Tm(Al_1-xMo_x)B₄ crystals at a maximum size of about 2.2 mm were obtained in the shape of a flake, and together with needle-like crystals of MoAlB and an unknown phase using Al_0.970Mo_0.030 flux. The lattice constants of Tm(Al_1-xMo_x)B₄ (x = 0.005 - 0.010) crystals were determined to be larger compared to those obtained for TmAlB₄. This is related to the fact that the ionic radius of Mo is larger than the ionic radius of Al. When the Al position in the TmAlB₄ structure was substituted with Mo having a large ionic radius, the hardness hardly changed. In contrast to TmAlB₄, no antiferromagnetic transition could be observed for Tm(Al_0.995Mo_0.005)B₄, indicating that the disorder introduced by Mo-doping disrupted the magnetic transition.

• Periodical: Solid State Phenomena (Volume 289)
• Pages: 65-70
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.289.65
• Online since: April 2019
• Authors: Shigeru Okada*, Kaoru Kouzu, Takashi Yamasaki, Takao Mori, Quan Sheng Guo, Toetsu Shishido, Kunio Yubuta, Gerda Rogl, Peter Rogl
• Keywords: Al-Self Flux, Chemical Analysis, Crystal Growth of Solid Solution Tm(Al_1-XMo_x)B₄ Compound, Lattice Constant, Magnetic Susceptibility, Micro-Vickers Hardness

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