Impedance spectroscopy analysis of the diffuse phase transition in lead-free (Ba0,85Ca0,15)(Zr0.1Ti0.9)O3 ceramic elaborated by sol-gel method

High-quality (1 −x)(Bi0.5Na0.5)TiO3–xSrTiO3lead-free piezoelectric thin films (x= 0, 0.1, and 0.25) on Pt(111)/Ti/SiO2/Si(100) substrates were prepared by a sol–gel method.

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Phase Transformations in Li-Mn-O Spinels Synthesized by Sol-Gel Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.443-444.311 ◽

2004 ◽

Vol 443-444 ◽

pp. 311-314 ◽

Cited By ~ 1

Author(s):

D. Lisovytskiy ◽

Z. Kaszkur ◽

V. N. Baumer ◽

J. Pielaszek ◽

J. Marzec ◽

...

Keyword(s):

Phase Transition ◽

High Temperature ◽

Thermogravimetric Analysis ◽

Impedance Spectroscopy ◽

Electric Conductivity ◽

Room Temperature ◽

Sol Gel ◽

Gel Method ◽

Sol Gel Method ◽

Lattice Constants

Abstract. Lithium-manganese spinels obtained by sol-gel method were studied by XRD, impedance spectroscopy, electric conductivity and thermogravimetric analysis (TGA). Heating of low-temperature spinels up to 630° C leads to the formation of spinels with lattice constants close to stoichiometric high-temperature spinels, which exhibit no phase transition around room temperature and have good electric conductivity.

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KNN-BF Lead-Free Piezoelectric Ceramics Synthesized by Sol-Gel Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.740.3 ◽

2015 ◽

Vol 740 ◽

pp. 3-6

Author(s):

Guo Yuan Cheng ◽

Xing Hua Fu ◽

Xin Jin ◽

Wen Hong Tao ◽

Yu Qin Qiang

Keyword(s):

Comparative Analysis ◽

Citric Acid ◽

Dielectric Loss ◽

Sintering Temperature ◽

Sol Gel ◽

Piezoelectric Ceramics ◽

Lead Free ◽

Gel Method ◽

Sol Gel Method ◽

Metal Chelator

KNN-BF piezoelectric ceramics synthesized by sol-gel method in this experiment. By controlling bismuth and iron content in the system to study effects of them. We selected citric acid as metal chelator and ethylene glycol as esterification agent. PH maintained 5-6 during preparation of the sol. Sintering temperature of ceramic selected 1100°C. Preparation ceramics under these conditions and comparative analysis, the structure of ceramics is single perovskite and shap of crystals are square block. With the increase of x, properties of ceramics firstly increases and then decreases: d33, εr, Qm, Kpreaching the maximum, values of them were 136pC/N, 630(f =1KHz), 212, 0.41 respectively; dielectric loss to minimum is 0.07(f =1KHz); at this point, ceramics had best performance.

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Monoclinic Li2TiO3 Nano-particles via sol-gel method: Structure and impedance spectroscopy

Mediterranean Journal of Chemistry ◽

10.13171/10.13171/mjc8319051109fza ◽

2019 ◽

Vol 8 (3) ◽

pp. 209

Author(s):

Fatima Zahra Krimech ◽

Salaheddine Sayouri ◽

Taj-Edine Lamcharfi ◽

Fatima Zahra Ahjyaje

Keyword(s):

Impedance Spectroscopy ◽

Sol Gel ◽

Low Frequency ◽

Transport Processes ◽

Nano Particles ◽

Secondary Phases ◽

Conventional Solid State Reaction ◽

Gel Method ◽

Sol Gel Method ◽

Heat Treated

Pure phase Li2TiO3 nano-particles were synthesized by the sol-gel method and the structural properties were examined with X-ray diffraction (XRD) technique. The latter showed that these materials, heat treated at relatively low temperature 900°C during 4h compared to the conventional solid-state reaction which calcination temperature is about 900–1100°C for 10 h; crystallize in the monoclinic phase without the presence of secondary phases. The microstructure of the LT ceramic (sintered at 1100°C) were determined by SEM and a good crystalline nature was observed with an average of granular size 2 μm. Moreover, the impedance spectroscopy showed at a higher temperature of 500°C the low-frequency arc due either to the grain boundary or sample-electrode charge transport processes.

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