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Structure and Microwave Dielectric Properties of Ultralow‐Temperature Cofirable BaV 2 O 6 Ceramics
Author(s) -
Neelakantan Unnimaya Avanoor,
Kalathil Suresh Elattuvalappil,
Ratheesh Ravendran
Publication year - 2015
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.201402844
Subject(s) - orthorhombic crystal system , ceramic , temperature coefficient , differential scanning calorimetry , microstructure , dielectric , raman spectroscopy , chemistry , analytical chemistry (journal) , thermogravimetric analysis , thermal expansion , crystal structure , microwave , lattice constant , mineralogy , materials science , diffraction , crystallography , composite material , thermodynamics , organic chemistry , optoelectronics , optics , physics , quantum mechanics
A new ultralow‐temperature‐sinterable BaV 2 O 6 ceramic was prepared through a conventional solid‐state ceramic method. Thermogravimetric and differential‐scanning‐calorimetry analyses were performed to confirm the phase formation of BaV 2 O 6 . Phase purity and crystal structure of the ceramic material were studied by using X‐ray diffraction analysis and Raman spectroscopic studies. BaV 2 O 6 crystallizes in an orthorhombic unit cell, and the calculated lattice parameters are a = 8.532 Å, b = 12.583 Å, and c = 7.554 Å. BaV 2 O 6 ceramic was well sintered at 550 °C for 1 h and exhibited a dense microstructure with excellent microwave properties, for example, a dielectric constant of 11.2, a Qxf value of 42790 GHz, and a temperature coefficient of resonant frequency of 28.2 ppm/°C. The BaV 2 O 6 ceramic exhibits a linear coefficient of thermal expansion of 10 ppm/°C in the range 30–350 °C. The BaV 2 O 6 ceramic shows good chemical compatibility with Al electrodes, which makes it as a suitable candidate material for ULTCC technology.