Molten Salts Synthesis of Relaxor Ferroelectrics PMN-PT Powders

2007 ◽  
Vol 336-338 ◽  
pp. 10-13 ◽  
Author(s):  
Shi Xi Zhao ◽  
Qiang Li ◽  
Feng Bing Song ◽  
Chun Hong Li ◽  
De Zhong Shen
Keyword(s):  
Molten Salt ◽  
Solid Solutions ◽  
Molten Salts ◽  
Processing Parameters ◽  
Relaxor Ferroelectrics ◽  
Molten Salt Synthesis ◽  
Uniform Size ◽  
Compositional Homogeneity ◽  
Average Size ◽  
Temperature Time

Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) solid solutions with composition near the morphotropic phase boundary (MPB) (33mol% PT) were successfully synthesized by the molten salt synthesis (MSS) method at 800°C for 30min using Li2SO4-Na2SO4 and NaCl-KCl molten salts as a medium of reaction, respectively. The influences of processing parameters, such as temperature, time, and type of salts, on the formation and the micrographs characteristics of the PMN-PT powders were discussion. It was found that the PMN-PT powder obtained by the MSS method has a relatively uniform size distribution and a better dispersivity of particle, and an average size of PMN-PT particles with smooth surface was around 0.3∼0.5 μm. With other conditions being kept same, chloride molten salt is more propitious to the formation of PMN- PT solid solutions, and improving the compositional homogeneity of PMN-PT powders.

Molten-salt synthesis of Ba5−xSrxNb4O15 solid solutions and their enhanced humidity sensing properties

2018 ◽  
Vol 44 (1) ◽  
pp. 477-483 ◽  
Author(s):  
Guo-Jin Ji ◽  
Le-Xi Zhang ◽  
Meng-Ya Zhu ◽  
Si-Meng Li ◽  
Jing Yin ◽  
...  
Keyword(s):  
Molten Salt ◽  
Solid Solutions ◽  
Molten Salt Synthesis ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Humidity Sensing Properties

Synthesis of Pure Bi12SiO20 Powder by Molten Salt Method

2012 ◽  
Vol 182-183 ◽  
pp. 52-56
Author(s):  
Jun Que Lu ◽  
Xiu Feng Wang ◽  
Hong Tao Jiang
Keyword(s):  
Particle Size ◽  
Molten Salt ◽  
Molten Salts ◽  
Raw Materials ◽  
Reaction Medium ◽  
Processing Parameters ◽  
Molten Salt Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pure Phase

Pure Bi12SiO20powder was successfully prepared by a molten salt method using Bi2O3and SiO2as raw materials and using KCl-K2CO3as flux at 635°C with the heating rate of 5°Cmin-1. The phase composition and microstructure of these products were analyzed by X-ray diffraction and scanning electron microscopy, and the effects of the processing parameters, such as the ratio of Bi2O3/SiO2, calciniation temperature, isothermal time and relative amount of salt, on the composition and particle size were investigated. The results indicated that regardless of changing the ratio of Bi2O3/SiO2, calciniation temperature, isothermal time or relative amount of salt the reaction only yielded Bi12SiO20without Bi2SiO5and Bi4Si3O12. Henceforth, KCl-K2CO3molten salts may be considered as an ideal reaction medium to synthesize pure phase of Bi12SiO20. The particle size of Bi12SiO20phase can be determined by changing the temperature, isothermal time and relative amount of salt.

MOLTEN SALT SYNTHESIS OF La2O2SO4 NANOSHEETS AND THEIR LUMINESCENT PROPERTIES WITH Eu3+ DOPING

2013 ◽  
Vol 06 (02) ◽  
pp. 1350019 ◽  
Author(s):  
XIAO-ZHU HUANG ◽  
ZHEN LIU ◽  
YIYI YANG ◽  
YANG TIAN
Keyword(s):  
Molten Salt ◽  
Molten Salts ◽  
Luminescent Properties ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
First Time

Two-dimensional nanosheets of lanthanum oxysulfates ( La2O2SO4 ) are prepared for the first time by a facile, effective molten salt synthesis route at a low temperature (400°C). Transmission electron microscopy (TEM) shows that the nanosheets are 100 nm to 200 nm thick and several micrometers in in-plane size. The intrinsic crystallography of the nanosheets is characterized by X-ray diffraction, high-resolution TEM, and selected area electron diffraction. The composition of the sample is studied by energy dispersive X-ray spectroscopy. The formation process of the nanosheets in molten salts is also investigated. The luminescence properties of the obtained La2O2SO4 nanosheets are investigated by doping with Eu3+ at different concentrations. The nanosheets are found to exhibit good monochromaticity with high color saturation.

Preparation of Flaky Alumina Powder by Molten Salt Synthesis Method

2014 ◽  
Vol 997 ◽  
pp. 428-432
Author(s):  
Qian Ying Zhang ◽  
Xun Geng
Keyword(s):  
Particle Size ◽  
Molten Salt ◽  
Synthesis Method ◽  
Morphology Control ◽  
Molten Salt Synthesis ◽  
Alumina Powder ◽  
High Quality ◽  
Uniform Size ◽  
Particle Size And Morphology ◽  
Size And Morphology

High-quality flaky α-Al2O3 powder with regular morphology, uniform size, larger diameter-thickness proportion and excellent dispersibility in water and free from agglomeration and staggered growth was obtained on the basis of molten salt synthesis method. The effects of experiment parameter on the particle size and morphology of flaky alumina powder were studied. The mechanism of morphology control was discussed.

SYNTHESIS OF ANISOTROPIC LEAD TITANATE POWDERS FOR TEMPLATED GRAIN GROWTH OF TEXTURED PIEZOELECTRIC CERAMICS

2010 ◽  
Vol 17 (02) ◽  
pp. 159-164 ◽  
Author(s):  
S. MA ◽  
J. Y. H. FUH ◽  
Y. F. ZHANG ◽  
L. LU
Keyword(s):  
Molten Salt ◽  
Heating Temperature ◽  
Synthesis Method ◽  
Processing Parameters ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
Thermal Synthesis ◽  
Flux Synthesis ◽  
One Step ◽  
Molten Salt System

Needle-shaped PbTiO3 (PT) template particles were successfully synthesized using two different types of approaches, molten salt synthesis (MSS) and thermal synthesis method. In eutectic NaCl–KCl molten salt system, homogeneous and nonagglomerated needle-shaped PT particles were produced from PbO and needle-like TiO2 compound heated at 800–850°C for 2 h. The effect of heating temperature on the morphology of formed powders was studied in order to identify the optimum processing parameters. The template formation mechanism is discussed. Using thermal synthesis method, comparable needle-shaped PT crystalline particles were also obtained in one step. Plate-shaped PT powders were derived via flux synthesis. The effect of additives such as MnCl2 and LiF on the morphology of derived PT was studied. Adding a certain amount of MnCl2 led to the formation of well-defined plate-shaped PT particles. The structure and morphology of synthesized powders were characterized by means of X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM).

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