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Towards good quality Bi2ZnB2O7 fibers grown by the micro-pulling down technique

Abstract : Bi2ZnB2O7 (BZBO) fibers grown by the micro-pulling down technique (m-PD) usually present a more or less pronounced color ranging from yellow to red and a microstructure showing glassy clear parts (more concentrated in bismuth) dispersed in a darker matrix. In a previous paper, we assumed a reaction between the platinum crucible and the melt to explain both their color and microstructure. To confirm or invalidate this hypothesis, BZBO fibers were pulled under different conditions by the m-PD or laser heated pedestal growth (LHPG) techniques. Various physical characterizations methods such as: SEM, EDS microprobe, Raman micro-spectroscopy, DTA and X-ray diffraction were performed to evaluate their crystal quality. Finally, it appears that the origin of the observed features of the fibers grown lies in the evaporation of a substantial amount of boron oxidefrom the melt. This leads to a shift of its composition in the ZnO-B2O3-Bi2O3 ternary system and an incongruent melting behavior. Therefore, the obtainment of colorless and transparent fibers requires very low pulling rates.
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Contributor : Michel Ferriol Connect in order to contact the contributor
Submitted on : Tuesday, June 28, 2016 - 8:57:33 AM
Last modification on : Wednesday, November 3, 2021 - 4:48:30 AM
Long-term archiving on: : Thursday, September 29, 2016 - 11:19:34 AM


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F. Assi, M. Ferriol, M. Cochez, M. Aillerie, B. Ponting, et al.. Towards good quality Bi2ZnB2O7 fibers grown by the micro-pulling down technique. Journal of Crystal Growth, 2016, 451, pp.1-5. ⟨10.1016/j.jcrysgro.2016.06.051⟩. ⟨hal-01338152⟩



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