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

Autor: Pascal Marchet, Gabriel Buse, Eric Lebraud, Mai Pham-Thi, Michel Lahaye, Michaël Josse, Matias Velázquez, Hughes Cabane, Ana Borta-Boyon, Cong Xin, Philippe Veber, Mario Maglione, Emmanuel Véron
Přispěvatelé: Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Thales Research and Technology [Palaiseau], THALES, Cristallinov, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Plateforme Aquitaine de Caractérisation des Matériaux (PLACAMAT), Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Lumière Matière [Villeurbanne] (ILM), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, The authors acknowledge the ANR program through HECATE project (No. 14-CE07-0028) and the Innovative Training Networks (ITN) - Marie Skłodowska-Curie Actions - European Joint Doctorate in Functional Materials Research (EJDFunMat) project (no. 641640) for financial and technical supports.
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Crystal Growth & Design
Crystal Growth & Design, American Chemical Society, 2018, 18 (10), pp.5874-5884. ⟨10.1021/acs.cgd.8b00596⟩
ISSN: 1528-7483
1528-7505
DOI: 10.1021/acs.cgd.8b00596⟩
Popis: International audience; 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.
Databáze: OpenAIRE
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