Growth and characterization of lead-free Ba(1−x)CaxTi(1−y)ZryO3 single crystal

• Published in: Journal of crystal growth Vol. 343; no. 1; pp. 17 - 20
• Main Authors: Zeng, Yiming, Zheng, Yanqing, Tu, Xiaoniu, Lu, Zhiping, Shi, Erwei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.03.2012; Elsevier
• Subjects: A1. Dielectric properties; A1. Raman spectrum; A2. Single crystal growth; B2. BCZT; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Crystal growth; Crystal structure; Curie temperature; Dielectric constant; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Diffraction; Exact sciences and technology; Growth from melts; zone melting and refining; Materials science; Methods of crystal growth; physics of crystal growth; Phase transformations; Physics; Single crystals; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; Titanium dioxide; B2. BCZT; A1. Raman spectrum; A1. Dielectric properties; A2. Single crystal growth; Crystal growth; Temperature dependence; Cubic lattices; Raman spectra; Barium; Cubic crystals; Curie point; Dielectric properties; Czochralski method; XRD; Raman spectroscopy; Phase transitions; Monocrystals; Zirconium oxide; Growth mechanism; Titanium oxide; Permittivity; Electron probes; Crystal growth from melts
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2012.01.009

A lead-free Ba(1−x)CaxTi(1−y)ZryO3 (BCZT) single crystal (x=0.08, y=0.26) was grown by the Czochralski (CZ) method in a mixed flux of TiO2 and ZrO2. The composition of as-grown BCZT was analyzed by electron probe micro-analysis. The structure, dielectric properties and phase transition were investigated at different temperatures. The X-ray diffraction results confirmed that the structure of the as-grown BCZT crystal was cubic both at 25°C and 500°C. The temperature dependence of the dielectric constant and Raman spectra characterization revealed that there was a phase transition from cubic to tetragonal, which happened between 200K and 250K. With increasing frequency, the Curie temperature shifted towards high temperature. ► Lead-free Ba(1−x)CaxTi(1−y)ZryO3(BCZT) single crystal is a new crystal. ► The XRD study shows the BCZT crystal structure was cubic both at 25°C and 500°C. ► The temperature dependence of dielectric constant shows the Tc of BCZT. ► Raman spectra reveal the phase transition happened between 200K and 250K.