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Growth and Characterization of Centimeter‐Sized Ba 2 LaFeNb 4 O 15 Crystals from High‐Temperature Solution under a Controlled Atmosphere
Author(s) -
Albino Marjorie,
Veber Philippe,
Castel Elias,
Velázquez Matias,
Schenk Kurt,
Chapuis Gervais,
Lahaye Michel,
Pechev Stanislav,
Maglione Mario,
Josse Michaël
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300008
Subject(s) - tetragonal crystal system , tungsten , chemistry , dielectric , diffraction , ceramic , permittivity , single crystal , analytical chemistry (journal) , paramagnetism , crystal growth , crystallography , crystal structure , optics , materials science , optoelectronics , condensed matter physics , physics , organic chemistry , chromatography
Centimeter‐sized single crystals of Ba 2 LaFeNb 4 O 15 were grown from a high‐temperature solution by using LiBO 2 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 ( T m = 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 Ba 2 LaFeNb 4 O 15 single crystals revealed an incommensurate structure at room temperature with a bidimensional modulation characterized by vectors q 1 = ( α , α , 1/2) and q 2 = ( 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.