Structure and Microwave Dielectric Properties of Ultralow‐Temperature Cofirable BaV 2 O 6 Ceramics

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.