Synthesis, characterization and dielectric relaxation of phase pure columbite MgNb2O6: Optimization of calcination and sintering

Realization of device quality PMN–PT ceramics using modulated heating method

“…Earlier studies have shown that the processing temperature is responsible for the formation of an unwanted corundum-like phase Mg 4 Nb 2 O 9 in the solid state synthesis of columbite-like MgNb 2 O 6 [6,24]. However, Swartz and Shrout mentioned that addition of 3-5% of excess of MgO considerably improved the perovskite PMN phase formation [1].…”

Dielectric Relaxation, Electrical Conductivity and Impedance Response of BaNb[sub 2]O[sub 6] Synthesized by Sol-Gel and Solid State Reaction Route: A Comparative Study

“…The values of dielectric constant increase with increase in temperature. This increase in dielectric response for both the samples, particularly at high temperature and low frequencies may be due to interfacial polarization dominating over dipolar polarization [8]. The observed peak in solid state route derived BN may be attributed to ionic conduction mechanism being dominant at high temperature.…”

Microwave dielectric properties of low-temperature-fired MgNb2O6 ceramics for LTCC applications

“…As known, the synthesis of pure-phase MgNb 2 O 6 ceramics is not easy. 23 In this work, pure-phase MgNb 2 O 6 ceramic was synthesized successfully by optimizing process parameters. Such as, the slightly excessive MgO, reasonable extension of the milling time and increase in the pre-sintering time.…”

“…George, Sumesh, et al 44 reported that the addition of LMZBS glass decreased the sintering temperature of Li 24,25 ). The powders were milled for 24 h, dried, and nally calcined at 1000 C for 8 h. (An appropriate increase in the pre-sintering time is conducive to the formation of singlephase MgNb 2 O 6 ceramic, and a reasonable extension of the milling time will increase the uniformity of particles and decrease particle size 23,26 21,22 was melted and quenched at 900 C. Then different weight percentages of LMZBS glasses (x ¼ 0.1 wt%, 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%) were added to the calcined MgNb 2 O 6 powders. Aer the second ball-milling for 12 h, the mixtures were dried, mixed with 10% PVB and then pressed into small cylinders 12 mm in diameter and 6 mm in height.…”