VEBER, Philippe; BARTOSIEWICZ, Karol; DEBRAY, Jérôme; ALOMBERT-GOGET, Guillaume; BENAMARA, Omar; MOTTO-ROS, Vincent; PHAM THI, Maï; BORTA-BOYON, Ana; CABANE, Hugues; LEBBOU, Kheirreddine; LEVASSORT, Franck; KAMADA, Kei; YOSHIKAWA, Akira; MAGLIONE, Mario

doi:10.1039/c9ce00405j

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VEBER, Philippe
iLM - Luminescence [iLM - LUMINESCENCE]

BARTOSIEWICZ, Karol
Tohoku University [Sendai]

DEBRAY, Jérôme
Cristaux massifs [NEEL - CrisMass]

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CrystEngComm. 2019, vol. 21, n° 25, p. 3844-3853

Royal Society of Chemistry

Résumé en anglais

BaTiO3-based crystal fibres with mm-sized grains were grown by the micro-pulling down technique from the BaTiO3–CaTiO3–BaZrO3 solid solution with pulling velocities of about 6, 9 and 15 mm h−1. The natural growth direction was identified as (001)pc. For the pulling velocities of about 15 mm h−1 and 9 mm h−1, effective partition coefficients have been calculated from Castaing micro-probe measurements, and gave, respectively, 1.3 and 2 for Zr, and 0.95 and 0.9 for Ca. Laser-induced breakdown spectroscopy measurements reveal a strong inhomogeneity and variations of Zr contents while Ca contents show an opposite variation trend with a more steady distribution. Coexistence of two crystallized perovskite solid solutions is suggested. Most efficient polycrystals with mm-sized grains and 0.5 mol% Zr and 11 mol% Ca as average contents exhibit Curie temperatures higher than 113 °C, electromechanical coupling factors kt up to 41% and piezoelectric charge coefficients d33 up to 242 pC N−1 at room temperature. These values are similar to piezoelectric coefficients reported in the literature for oriented flux-grown single crystals with close compositions. Both chemical and physical results obtained in the BCTZ system make the μ-PD technique a promising way to improve the piezoelectric response of lead-free solid solution-based single crystals.< Réduire

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Lead-free

Piezoelectrics

Micro-pulling down

Elemental segregation

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Lead-free piezoelectric crystals grown by the micro-pulling down technique in the BaTiO3–CaTiO3–BaZrO3 system

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