Spinodal Decomposition in Lead-free Piezoelectric BaTiO3 –CaTiO3 –BaZrO3 Crystals

Abstract : Polycrystals and centimeter-sized BaTiO3-based single crystals were grown by top seeded solution growth from the BaTiO3–CaTiO3–BaZrO3 system. High effective partition coefficients of Zr ranging from 15 to 6 with small Zr content have been calculated from Castaing microprobe measurements, whereas those of Ca increase slightly from 0.45 to 0.7. A spinodal decomposition mechanism is emphasized during the growth leading to the emergence of two phases with close compositions. Chemical analysis displayed periodical Zr and Ca content fluctuations within the whole boules, and Rietveld measurements highlighted two phases belonging to perovskite structures with tetragonal P4mm and orthorhombic Amm2 space groups. Samples with various calcium and zirconium contents were characterized by means of dielectric and piezoelectric measurements. Most efficient samples are indistinctly polycrystals or oriented single crystals where electromechanical performances are compositional-dependent. Polycrystalline samples and single crystals oriented along (001)pc and (110)pc displayed Curie temperatures ranging from 50 to 111 °C. Electromechanical coupling factor up to 58% and piezoelectric charge coefficient d33 = 496 pC·N–1 were obtained at room temperature. The miscibility gap between the two perovskite solid solutions as well as Ca and Zr element content variation in single crystals lower crystal piezoelectric response that remains nonetheless of the same efficiency compared to that of ceramics of the same composition.
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

Littérature citée [56 références]  Voir  Masquer  Télécharger

https://hal-unilim.archives-ouvertes.fr/hal-01891394
Contributeur : Pascal Marchet <>
Soumis le : mercredi 28 août 2019 - 14:54:00
Dernière modification le : jeudi 29 août 2019 - 11:28:44

Fichier

Spinodal decomposition in lead...
Fichiers produits par l'(les) auteur(s)

Identifiants

Citation

Gabriel Buse, Cong Xin, Pascal Marchet, Ana Borta-Boyon, Maï Pham-Thi, et al.. Spinodal Decomposition in Lead-free Piezoelectric BaTiO3 –CaTiO3 –BaZrO3 Crystals. Crystal Growth and Design, American Chemical Society, 2018, 18 (10), pp.5874 - 5884. ⟨10.1021/acs.cgd.8b00596⟩. ⟨hal-01891394⟩

Partager

Métriques

Consultations de la notice

154

Téléchargements de fichiers

32