1. Growth and Characterization of Centimeter‐Sized Ba 2 LaFeNb 4 O 15 Crystals from High‐Temperature Solution under a Controlled Atmosphere
- Author
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Philippe Veber, Stanislav Pechev, Marjorie Albino, Kurt Schenk, Elias Castel, Mario Maglione, Michel Lahaye, Gervais Chapuis, Matias Velázquez, Michaël Josse, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Laboratoire de Cristallographie, and Ecole Polytechnique Fédérale de Lausanne (EPFL)
- Subjects
Controlled atmosphere ,Niobium ,Analytical chemistry ,Relaxors ,chemistry.chemical_element ,Mineralogy ,Crystal growth ,02 engineering and technology ,Tungsten ,010402 general chemistry ,01 natural sciences ,Solid-state structures ,Inorganic Chemistry ,Paramagnetism ,Tetragonal crystal system ,Ceramic ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Magnetic susceptibility ,0104 chemical sciences ,chemistry ,Barium ,visual_art ,visual_art.visual_art_medium ,Flux methods ,0210 nano-technology - Abstract
International audience; Centimeter-sized single crystals of Ba2LaFeNb4O15 were grown from a high-temperature solution by using LiBO2 flux and a sealed platinum assembly. The obtained single crystals display the same physical properties as their ceramic counterparts. A frequency-dependent dielectric permittivity maximum was found (Tm = 100 K at 5 kHz), which indicates relaxor behavior. Magnetic susceptibility measurements revealed purely paramagnetic behavior between 10 and 350 K. X-ray diffraction measurements of Ba2LaFeNb4O15 single crystals revealed an incommensurate structure at room temperature with a bidimensional modulation characterized by vectors q1 = (α, α, 1/2) and q2 = (α, -α, 1/2) with α = 0.295(1). This crystal growth method offers a promising elaboration route to centimeter-sized crystals of niobate-based compounds, which may not be grown from the pure liquid phase, especially those with a tetragonal tungsten bronze (TTB) structure.
- Published
- 2013
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