Microwave synthesis of high dielectric constant CaCu3Ti4O12

Microwave versus conventional sintering: A review of fundamentals, advantages and applications

“…There are some cases reported after heating for several days at temperatures up to 1000 • C with some intermittent regrinding stages for obtaining single phase CCTO powder [43]. Microwave heating has been suggested as a means of reducing the time of preparation and the energy consumption by Yu et al [44]. The green pellets calcining were performed in both microwave and conventional electric furnace at 1000 • C for comparison.…”

“…18. The sintered pellets from microwave synthesised powders possess a higher dielectric constant than that from conventional synthesised powders [44]. High-permeability NiZn ferrites have been widely applied in various electronic devices.…”

Improving the crystallinity and magnetocaloric effect of the perovskite La0.65Sr0.35MnO3 using microwave irradiation

“…al recognised that there were enhanced dielectric properties of the perovskite CaCu3Ti4O12 when synthesised using MW heating. 56 As there is a great deal of similarity in how dielectric and magnetic properties arise in materials 39,40 we could also expect enhanced magnetic properties (magnetic susceptibility, magnetic hysteresis and magnetocaloric effect) of a similar material processed using MW technology. With this in mind, this investigation aims to look at the effect of the use of MW irradiation in a modified peroxide sol-gel synthesis on the magnetic properties of lanthanum strontium manganate (LSMO) compared with conventional heating.…”

Dielectric properties of microwave flash combustion derived and spark plasma sintered CaCu3Ti4O12 ceramic: role of reduction in grain boundary activation energy

“…These techniques have reduced processing time and temperature, and enhanced its dielectric properties. Some of the reported synthesis technique are sol-gel [13], polymerized complex method [14], coprecipitation [15], wet-chemical synthesis using nitrate and organometallic salts [16], polymeric citrate precursor method [17], pyrolysis of organic solution [18], microwave calcination of oxide powders [19], molten salt method [20], etc. Many of them have produced the nanoparticle of CCTO.…”