scholarly journals Phase formation and electrical properties of the LaCoO3 obtained by water-based sol-gel method with citric acid

2009 ◽  
Vol 3 (1-2) ◽  
pp. 39-42 ◽  
Author(s):  
Luminita Predoana ◽  
Barbara Malic ◽  
Marija Kosec ◽  
Mariana Scurtu ◽  
Monica Caldararu ◽  
...  
Keyword(s):  
Citric Acid ◽  
Electrical Properties ◽  
Gas Flow ◽  
Sol Gel ◽  
Rhombohedral Phase ◽  
Gel Method ◽  
Sol Gel Method ◽  
Water Based ◽  
Dta And Tg ◽  
Lanthanum Cobalt Oxide

In the present work the LaCoO3 formation from gel precursors obtained by water-based sol-gel method with citric acid was studied. As precursors La and Co nitrates were used. The obtained gels were analyzed by TG/ DTA and TG/EGA. The decomposition of the gels takes place in two main steps with the evolution of the same volatile compounds (H2O, CO2 and NO2) leading to the conclusion that two types of bonding of the components in the gels occurred. The decomposition of the gels takes place up to 400?C. The gels thermally treated at 600?C lead to single pure perovskite rhombohedral phase of lanthanum cobalt oxide (LaCoO3). Some electrical properties of LaCoO3 measured in 'operando' conditions, i.e. in gas flow, at atmospheric pressure (by using the differential step technique DST) are presented and discussed.

Characterization of LaCoO3 powders obtained by water-based sol–gel method with citric acid

2007 ◽  
Vol 27 (13-15) ◽  
pp. 4407-4411 ◽  
Author(s):  
Luminita Predoana ◽  
Barbara Malic ◽  
Marija Kosec ◽  
Mariana Carata ◽  
Monica Caldararu ◽  
...  
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Water Based

Low-Temperature Sintering and Enhanced Piezoelectric Properties in KNN-LTS Nanopowder Prepared via a Low-Cost Water-Based Sol-Gel Method

2014 ◽  
Vol 602-603 ◽  
pp. 795-799
Author(s):  
Yu Huan ◽  
Xiao Hui Wang ◽  
Long Tu Li
Keyword(s):  
Electrical Properties ◽  
High Performance ◽  
Low Cost ◽  
Sol Gel ◽  
Average Particle Size ◽  
Lead Free ◽  
Average Particle ◽  
Gel Method ◽  
Sol Gel Method ◽  
Water Based

nanoscale lead-free perovskite powders with a composition of (Na0.52K0.4425Li0.0375)(Nb0.9125Ta0.0375Sb0.05)O3 (KNN-LTS) have been synthesized via a low-cost water-based sol-gel method, to reduce the sintering temperature and enhance the electrical properties. KNN-LTS nanopowders with average particle size of about 20 nm are obtained by citrate precursor sol-gel process, where Nb (OH)5 and Sb2O3 are used to replace the costly mental alkoxides. The sol-gel derived nanopowders can be densified at lower temperature of 940 °C and exhibited excellent electrical properties after sintering at 1020 °C (d33 = 396 pC/N, kp = 50.1% = 1882 and tanδ = 0.02), providing a tremendous potential method for high-performance lead-free ceramics preparation.

LaCoO3 formation from precursors obtained by water-based sol–gel method with citric acid

2009 ◽  
Vol 98 (2) ◽  
pp. 361-366 ◽  
Author(s):  
Luminita Predoana ◽  
Barbara Malic ◽  
Maria Zaharescu
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Water Based

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

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.

Investigation of electrical properties in La-doped BiFeO3–PbTiO3 thin films prepared by sol–gel method

2015 ◽  
Vol 76 (1) ◽  
pp. 220-226 ◽  
Author(s):  
Dongfang Chen ◽  
Shengli Huang ◽  
Jianguo Chen ◽  
Jinrong Cheng
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
La Doped

Microstructural, magnetic and electrical properties of Zn0.4M0.3Co0.3Fe2O4 (M = Ni and Cu) ferrites synthesized by sol–gel method

2018 ◽  
Vol 29 (8) ◽  
pp. 6879-6891 ◽  
Author(s):  
Sobhi Hcini ◽  
Aref Omri ◽  
Michel Boudard ◽  
Mohamed Lamjed Bouazizi ◽  
Abdessalem Dhahri ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Magnetic And Electrical Properties

Microstructural, Optical and Electrical Properties of ZnO:Sn Thin Films Deposited by Sol-Gel Method

2013 ◽  
Vol 652-654 ◽  
pp. 519-522
Author(s):  
Jun Chen ◽  
Yue Hui Hu ◽  
Hong Hao Hu ◽  
Yi Chuan Chen
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Sol Gel ◽  
Hexagonal Structure ◽  
Optical And Electrical Properties ◽  
Axis Orientation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sn Doping ◽  
Glass Substrates

Transparent thin films of Sn-doped ZnO (ZnO:Sn) were deposited onto silica glass substrates by the sol–gel method. The effect of different Sn doping on the crystallinity, structural, optical and electrical properties of ZnO:Sn thin films were investigated by XRD, SEM, UV-VIS spectrophotometer and four-point probe method respectively. Among all of ZnO:Sn thin films in this paper, Sn-doped with 2 at.% exhibited the best properties, the surface demonstrate an accumulative crystallization and hexagonal structure, with a high-preferential c-axis orientation, namely an average transmittance of 90% and the resistivity of 19.6 Ω·cm.

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