Improvements in the Sintering Behavior and Microwave Dielectric Properties of Geikielite-Type MgTiO3 Ceramics

Synthesis, characterization, and microwave dielectric properties of ternary-phase ixiolite-structure MgTiNb2O8 ceramics

“…Secondly weight loss, combined with a significantly exothermal peak in the temperature region of 400-600 1C, was attributed to the oxidation of metal-organic groups. TG results of Mg-Ti-Nb xerogel were also similar with these of other xerogel synthesized by sol-gel methods [12,13]. In XRD patterns at 600-700 1C there were no significant reflection peaks, which meant amorphous state of MTN phase.…”

Synthesis, characterization, and microwave dielectric properties of ixiolite-structure ZnTiNb2O8 ceramics through the aqueous sol–gel process

“…Firstly obvious weight loss began at 200°C and initial weight loss was below 400°C, resulting from the evaporation of residual solvent and the decomposition of the organic polymeric network with evolution of CO 2 and H 2 O. Secondly weight loss occurred in TG curves, combined with a significantly exothermal peak in the temperature region of 400-600°C, which was attributed to the oxidation of metal-organic groups. TG results of Zn-Ti-Nb xerogel were also similar with these of other ceramic xerogel synthesized by sol-gel methods [27,28]. It was obvious that no further significant weight loss and thermometric peaks were observed above 600°C in TG-DTA curves, which indicated the minimum firing temperature to synthesize the ZTN phases.…”

Improvements in the sintering behavior and microwave dielectric properties of fergusonite-type NdNbO4 ceramics

“…Firstly obvious weight loss began at 200 1C and initial weight loss (about 50%) was below 400 1C, resulting from the evaporation of residual solvent and the decomposition of the organic polymeric network with evolution of CO 2 and H 2 O. Secondly weight loss (about 20-40%) occurred in TG curves, combined with a significantly exothermal peak in the temperature region of 400-550 1C, which was attributed to the oxidation of metalorganic groups. TG results of the NdNbO 4 xerogel were also similar to those of other ceramic xerogels synthesized by solgel methods [19][20][21]. It was obvious that no further significant weight loss and thermometric peaks were observed above 600 1C in TG-DTA curves, which indicated the minimum firing temperature to synthesize the magnesium titanate phases.…”