Influence of Molar Ratio of Citric Acid to Metal Ions on Structure, Microstructure and Electrical Transport Properties on Nanosized La0.85Na0.15MnO3

2015 ◽  
Vol 1107 ◽  
pp. 261-266
Author(s):  
Kean Pah Lim ◽  
Kuen Hou Cheong ◽  
Abdul Halim Shaari ◽  
Mansor Hashim ◽  
Albert Han Ming Gan ◽  
...  
Keyword(s):  
Citric Acid ◽  
Metal Ions ◽  
Grain Boundaries ◽  
Transport Properties ◽  
Electrical Transport ◽  
Perovskite Phase ◽  
Hexagonal Structure ◽  
Molar Ratio ◽  
High Resistivity ◽  
Electrical Transport Properties

In this paper, nanosized La0.85Na0.15MnO3 (LNMO) has been synthesized via sol-gel method by involving two major steps, first the complexation of citric acid (CA) with metal ions (MI) and second the polyesterification between CA and ethylene glycol (EG). The effect of molar ratio CA:MI varying from 2-4 on structure, microstructure and electrical transport properties of LNMO have been investigated by constant the amount of EG. All samples show single perovskite phase with hexagonal structure and space group R3c after sintering at 800°C for 10h. Sample of molar ratio 2.5 is observed to possess smallest grain sizes which yield high resistivity value compared with others, is suggested to originate from the increase of tunneling barriers (grain boundaries). The large low field magnetoresistance (LFMR) of about ~ -16% at 0.1T and low temperature confirmed the important role of grain boundaries in the nanosized LNMO.

Study of Structural and Electrical Transport Properties of Polycrystalline La1-XCaXMnO3 (x=0.33, 0.5 and 0.9) Prepared by a Co-Precipitation Method

2013 ◽  
Vol 652-654 ◽  
pp. 576-580 ◽  
Author(s):  
Mya Theingi ◽  
Ji Ma ◽  
Hui Zhang ◽  
Xiang Gao ◽  
Jian Hong Yi ◽  
...  
Keyword(s):  
Transport Properties ◽  
Electrical Transport ◽  
Perovskite Phase ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Electrical Transport Properties ◽  
X Ray ◽  
Manganite Perovskite ◽  
Polycrystalline Ceramics ◽  
Co Precipitation

Manganite perovskite La1-xCaxMnO3(x=0.33, 0.5 and 0.9) have been prepared by chemical co-precipitation method. Ammonium carbonate was used to coprecipitate lanthanum, calcium and manganese ions as carbonates under basic condition. This precursor on calcining at 900°C yields La-Ca-Mn-O perovskite phase. Follow by sintering at 1200°C after the powders were pressed into pellets gave La1-xCaxMnO3(LCMO) polycrystalline ceramics. The crystal phases of the resulting powders and ceramics were examined by X-ray diffraction (XRD) technique. The morphology of the powders was observed by scanning electron microscopy (SEM) and electrical transport properties of ceramics were measured by conventional four-point probe technique.

Electrical transport properties of transparent PLZT ceramics: Bulk and grain boundaries

2012 ◽  
Vol 208 ◽  
pp. 4-7 ◽  
Author(s):  
Z.H. Cui ◽  
G. Gregori ◽  
A.L. Ding ◽  
X.X. Guo ◽  
J. Maier
Keyword(s):  
Grain Boundaries ◽  
Transport Properties ◽  
Electrical Transport ◽  
Electrical Transport Properties

Electrical transport properties of [001] tilt bicrystal grain boundaries in YBa2Cu3O7

1996 ◽  
Vol 68 (1) ◽  
pp. 120-122 ◽  
Author(s):  
D. G. Steel ◽  
J. D. Hettinger ◽  
F. Yuan ◽  
D. J. Miller ◽  
K. E. Gray ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Transport Properties ◽  
Electrical Transport ◽  
Electrical Transport Properties

Electrical transport properties of TiCoSb half-Heusler phases that exhibit high resistivity

2000 ◽  
Vol 13 (1) ◽  
pp. 77-89 ◽  
Author(s):  
Y Xia ◽  
V Ponnambalam ◽  
S Bhattacharya ◽  
A L Pope ◽  
S J Poon ◽  
...  
Keyword(s):  
Transport Properties ◽  
Electrical Transport ◽  
High Resistivity ◽  
Electrical Transport Properties
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