Water-Based Soft Chemical Synthesis of Apatite Type Lanthanum Silicate Powder in Nano-Scale

2019 ◽  
Vol 16 (51) ◽  
pp. 423-428 ◽  
Author(s):  
Kiyoshi Kobayshi ◽  
Yukiko Oyama ◽  
Shogo Miyoshi ◽  
S. Yamaguchi ◽  
Chikashi Nishimura
Keyword(s):  
Chemical Synthesis ◽  
Nano Scale ◽  
Water Based ◽  
Soft Chemical Synthesis ◽  
Lanthanum Silicate ◽  
Apatite Type

Facile preparation of apatite-type lanthanum silicate by a new water-based sol–gel process

2013 ◽  
Vol 48 (6) ◽  
pp. 2227-2231 ◽  
Author(s):  
Chieko Yamagata ◽  
Daniel R. Elias ◽  
Mayara R.S. Paiva ◽  
Agatha M. Misso ◽  
Sonia R.H. Mello Castanho
Keyword(s):  
Sol Gel ◽  
Sol Gel Process ◽  
Water Based ◽  
Facile Preparation ◽  
Lanthanum Silicate ◽  
Apatite Type

Soft Chemical Synthesis of HxCrS2: An Antiferromagnetic Material with Alternating Amorphous and Crystalline Layers

2019 ◽  
Vol 141 (39) ◽  
pp. 15634-15640 ◽  
Author(s):  
Xiaoyu Song ◽  
Guangming Cheng ◽  
Daniel Weber ◽  
Florian Pielnhofer ◽  
Shiming Lei ◽  
...  
Keyword(s):  
Chemical Synthesis ◽  
Soft Chemical Synthesis

Low-temperature sintering of dense lanthanum silicate electrolytes with apatite-type structure using an organic precipitant synthesized nanopowder

2009 ◽  
Vol 24 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Seung Hwan Jo ◽  
P. Muralidharan ◽  
Do Kyung Kim
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Type Structure ◽  
Degree Of Crystallinity ◽  
Polished Surface ◽  
Synthetic Approach ◽  
Low Temperature Sintering ◽  
Lanthanum Silicate ◽  
Microscopy Images ◽  
Apatite Type

Highly sinterable La10Si6O27 and La10Si5.5M0.5O27 (M = Mg, and Al) nanopowders with apatite-type structure have been synthesized via a homogeneous precipitation method using diethylamine (DEA) as a precipitant. The synthetic approach using an organic precipitant with dispersant characteristics is advantageous in configuring weakly agglomerated nanopowders, leading to desirable sintering activity. X-ray diffraction powder patterns confirmed the single-phase crystalline lanthanum silicate of hexagonal apatite structure at 800 °C, which is a relatively lower calcination temperature compared to conventionally prepared samples. Transmission electron microscopy images revealed particles ∼30 nm in size with a high degree of crystallinity. A dense grain morphology was recognized from the scanning electron microscopy images of the polished surface of the pellets that were sintered at 1400 and 1500 °C for 10 h. This low-temperature sintering is significant because conventional powder processing requires a temperature above 1700 °C to obtain the same dense electrolyte. The doped-lanthanum silicate electrolyte prepared by the DEA process and sintered at 1500 °C for 10 h exhibited electrical conductivity comparable with samples prepared at much higher sintering temperature (>1700 °C).

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