Fabrication and Properties of Highly Pure BiFeO$lt;inf$gt;3$lt;/inf$gt; Using A Solid State Reaction-molten Salt Synthesis Method with Non-equilibrium Process

2014 ◽  
Vol 29 (11) ◽  
pp. 1151 ◽  
Author(s):  
WU Xing ◽  
LI Hai-Feng ◽  
ZHOU Jin-Ling ◽  
HUO Min-Feng ◽  
CHENG Cheng ◽  
...  
Keyword(s):  
Solid State ◽  
Molten Salt ◽  
Solid State Reaction ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Equilibrium Process ◽  
Non Equilibrium

Molten Salt Synthesis of Nanocrystalline Phase of High Dielectric Constant Material CaCu3Ti4O12

2008 ◽  
Vol 8 (11) ◽  
pp. 5762-5769 ◽  
Author(s):  
B. Shri Prakash ◽  
K. B. R. Varma
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Solid State ◽  
Molten Salt ◽  
Solid State Reaction ◽  
Molten Salt Synthesis ◽  
Reaction Route ◽  
Conventional Solid State Reaction ◽  
Phase Pure ◽  
Solid State Reaction Route

Nanocrystalline powders of giant dielectric constant material, CaCu3Ti4O12 (CCTO), have been prepared successfully by the molten salt synthesis (MSS) using KCl at 750 °C/10 h, which is significantly lower than the calcination temperature (∼1000 °C) that is employed to obtain phase pure CCTO in the conventional solid-state reaction route. The water washed molten salt synthesized powder, characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM) confirmed to be a phase pure CCTO associated with ∼150 nm sized crystallites of nearly spherical shape. The decrease in the formation temperature/duration of CCTO in MSS method was attributed to an increase in the diffusion rate or a decrease in the diffusion length of reacting ions in the molten salt medium. As a consequence of liquid phase sintering, pellets of as-synthesized KCl containing CCTO powder exhibited higher sinterability and grain size than that of KCl free CCTO samples prepared by both MSS method and conventional solid-state reaction route. The grain size and the dielectric constant of KCl containing CCTO ceramics increased with increasing sintering temperature (900 °C–1050 °C). Indeed the dielectric constants of these ceramics were higher than that of KCl free CCTO samples prepared by both MSS method and those obtained via the solid-state reaction route and sintered at the same temperature. Internal barrier layer capacitance (IBLC) model was invoked to correlate the observed dielectric constant with the grain size in these samples.

Novel Low Temperature Molten Salt Synthesis of a Li5La3Nb2O12 Solid State Electrolyte and Its Properties

2014 ◽  
Vol 1679 ◽  
Author(s):  
Shiang Teng ◽  
Wei Wang ◽  
Ashutosh Tiwari
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Molten Salt ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
Solid State Electrolyte ◽  
Li Ion ◽  
Quality Material ◽  
Li Content

ABSTRACTThe solid state electrolyte (SSE) of Li5La3Nb2O12 (LLNO) was synthesized via a novel molten salt synthesis (MSS) method at the relatively low temperature of 900°C. The low sintering temperature prevented the loss of lithium that commonly occurs during synthesis of the SSE using conventional solid state or wet chemical reactions. Recent publications have demonstrated that preserving the Li content is critical in improving the ionic conductivity of SSEs. The LLNO in this experiment showed a high Li-ion conductivity which is comparable to other values reported for LLNO. X-ray diffraction (XRD) measurements confirmed the formation of the cubic garnet Ia-3d crystal structure. In addition, the morphology was examined by scanning electron microscopy (SEM), which showed a uniform grain size and crack-free microstructure. These results demonstrate that MSS is a powerful synthesis method to fabricate LLNO at a relatively low temperature while still achieving a high quality material.

ChemInform Abstract: Preparation of Polycrystalline HT-LiCoO2 Using Molten Salt Synthesis Method at 280 °C.

ChemInform ◽  
2001 ◽  
Vol 32 (14) ◽  
pp. no-no
Author(s):  
Young-Sik Hong ◽  
Chi-Hwan Han ◽  
Keon Kim
Keyword(s):  
Molten Salt ◽  
Synthesis Method ◽  
Molten Salt Synthesis

Formation Mechanism of SrBi2Nb2O9 Prepared by Melting Salt Method

2010 ◽  
Vol 177 ◽  
pp. 12-15
Author(s):  
Bao Rang Li ◽  
Xing Tao Liu ◽  
Yang Sheng Zheng ◽  
Hui Bin Chang
Keyword(s):  
Molten Salt ◽  
Formation Mechanism ◽  
Reaction Mechanisms ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Synthesis Reaction ◽  
Simple Route ◽  
Temperature Range ◽  
Synthesis Route ◽  
Molten Medium

In this paper SrBi2Nb2O9 was prepared by molten salt synthesis method and KCl chosen as molten medium. In order to disclose possible formation mechanism of SrBi2Nb2O9, a simple route was established for comparison by dividing the starting precursors into four groups. With the help of XRD, possible synthesis route was analyzed. The results showed that pure SrBi2Nb2O9 powders could be obtained at temperature higher than 700oC by molten salt synthesis. Intense synthesis reaction happened in the temperature range from 500 to 700oC. The reaction mechanisms of SrBi2Nb2O9 included four steps, namely the formation of 1) SrBi2O4 at close to 600oC,2) BiNbO4 from the reaction of at 600-700 oC, 3) SrBi2Nb2O9 from the reaction of SrBi2O4 and Nb2O5 and 4)SrBi2Nb2O9 from the reaction of BiNbO4 and SrCO3. The molten salt could improve distribution and reactivity of the precursors and significant formation of SrBi2Nb2O9.

ChemInform Abstract: Molten Salt Synthesis and Properties of Three New Solid-State Ternary Bismuth Chalcogenides, β-CsBiS2, γ-CsBiS2 and K2Bi8Se13.

ChemInform ◽  
2010 ◽  
Vol 24 (24) ◽  
pp. no-no
Author(s):  
T. J. MCCARTHY ◽  
S.-P. NGEYI ◽  
J.-H. LIAO ◽  
D. C. DEGROOT ◽  
T. HOGAN ◽  
...  
Keyword(s):  
Solid State ◽  
Molten Salt ◽  
Molten Salt Synthesis ◽  
Bismuth Chalcogenides
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