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.
Type de document :
Article dans une revue
Journal of Crystal Growth, Elsevier, 2016, 451, pp.1-5. 〈10.1016/j.jcrysgro.2016.06.051〉
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https://hal.univ-lorraine.fr/hal-01338152
Contributeur : Michel Ferriol <>
Soumis le : mardi 28 juin 2016 - 08:57:33
Dernière modification le : jeudi 5 avril 2018 - 12:30:21
Document(s) archivé(s) le : jeudi 29 septembre 2016 - 11:19:34

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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, Elsevier, 2016, 451, pp.1-5. 〈10.1016/j.jcrysgro.2016.06.051〉. 〈hal-01338152〉

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