Low-temperature synthesis of SiC in heat-treatment of gels of hydrolyzed ethyl silicate

Refractories ◽  
1996 ◽  
Vol 37 (9) ◽  
pp. 306-311 ◽  
Author(s):  
G. D. Semchenko
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Ethyl Silicate ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

Low-temperature synthesis of ribbon-like orthorhombic NaNbO3 fibers and their photocatalytic activities for H2 evolution

RSC Advances ◽  
2015 ◽  
Vol 5 (42) ◽  
pp. 33001-33007 ◽  
Author(s):  
Deqing Zhang ◽  
Junye Cheng ◽  
Feng Shi ◽  
Zhangjie Cheng ◽  
Xiuying Yang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Annealing Temperature ◽  
H2 Evolution ◽  
Post Heat Treatment ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Photocatalytic Activities

Ribbon-like orthorhombic NaNbO3 fibers were successfully prepared by combining a traditional hydrothermal method with post-heat treatment at a low annealing temperature.

scholarly journals LOW-TEMPERATURE SYNTHESIS OF BARIUM TITANITE IN AQUEOUS SOLUTION

2018 ◽  
Vol 61 (12) ◽  
pp. 56-62 ◽  
Author(s):  
Alexandr V. Agafonov ◽  
Konstantin V. Ivanov ◽  
Olga V. Alekseeva
Keyword(s):  
Heat Treatment ◽  
Barium Titanate ◽  
Thermal Treatment ◽  
Low Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Temperature Phase ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

Barium titanate powder with average particle size near 300 nm was produced using the low-temperature synthesis. It was established using scanning electron microscopy that at the thermal treatment, the particles gradually decrease with the formation of polydisperse aggregates. Based on the thermogravimetric analysis of the synthesized powder held in air for 4 months, it was shown that along with the low-temperature phase, the sample contains a high-temperature phase of carbonates, which removes at ~ 900 °C. Sorption characteristics of barium titanate thermally treated at various temperatures were obtained from the results of adsorption-desorption of nitrogen vapors. The specific surface area of the BaTiO3 powder was 76 m2/g. It was found that further heat treatment leads to a decrease in the specific surface area. The X-ray diffraction analysis of barium hydroxotitanil annealed at temperatures from 120 °C to 800 °C showed that the thermal treatment of the sample leads to the formation of a completely formed phase of barium titanate. The DSC temperature was used to determine the Curie temperatures for a HTB powder thermally treated in the temperature range from 120 to 800 °C. Dielectric spectra of suspensions of the synthesized powder were obtained during the heat treatment. <span style="opacity: 0;"> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . </span>

scholarly journals Low-Temperature Synthesis of the Li2S-P2S5 Electrolytes by a Milling Process Combined with Heat Treatment

2011 ◽  
Vol 79 (9) ◽  
pp. 701-705
Author(s):  
Sho NAKASHIMA ◽  
Shigeo KONDO ◽  
Yuji OOURA ◽  
Nobuya MACHIDA ◽  
Atsushi HIRANO ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Milling Process ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

Study on the Preparation of BaTiO3 Nano Powder via Non-Hydrolytic Sol-Gel Method

2015 ◽  
Vol 1104 ◽  
pp. 107-110
Author(s):  
Zhi Peng Shao ◽  
Wei Hui Jiang ◽  
Guo Feng ◽  
Jian Min Liu ◽  
Li Feng Miao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Sol Gel ◽  
Particle Diameter ◽  
Average Particle ◽  
Barium Acetate ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Nano Powder ◽  
Titanium Tetrabutoxide

BaTiO3 (BT) nano powder was prepared via non-hydrolytic sol-gel (NHSG) method by using barium acetate, titanium tetrabutoxide as precursors, glycerol and ethanol as solvents. The samples were characterized by DTA-TG, XRD, FT-IR and TEM. The influences of heat treatment temperature on the morphology and the microstructure of powder were studied, and the mechanism of low temperature synthesis was discussed. In addition, the de-esterification action between the precursors was also described in detail. The results show that the formation of Ba-O-Ti bond in the xerogel via NHSG route is duo to the de-esterification polycondensation of barium acetate and titanium tetrabutoxide, which plays the key role in the low temperature synthesis of BT powder. With the temperature rising to 700 °C, BT nano powder with good dispersion and even size distribution can be acquired and the average particle diameter is about 25 nm. Overlow and overhigh heat treatment temperatures are both not beneficial to the preparation of BT nano powder.

Low-temperature Synthesis and Characterizations of LaFeAsO Nanocrystals

2015 ◽  
Vol 30 (12) ◽  
pp. 1273
Author(s):  
ZHANG De-Xing ◽  
SUN Yun-Lei ◽  
ABULIMIT Abuduweli ◽  
CAO Guang-Han
Keyword(s):  
Low Temperature ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis
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