scholarly journals Comparison of Fe2TiO5/C photocatalysts synthesized via a nonhydrolytic sol–gel method and solid-state reaction method

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43762-43772
Author(s):  
Qianqian Zhao ◽  
Guo Feng ◽  
Feng Jiang ◽  
Shanfang Lan ◽  
Junhua Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Gel Method ◽  
Sol Gel Method

Two different methods were used to prepare Fe2TiO5/C photocatalysts, demonstrating the superiorities of in situ carbon introduced by a NHSG method.

Properties of Na1/2Bi1/2TiO3 Ceramic Prepared by Sol-Gel Method

2007 ◽  
Vol 280-283 ◽  
pp. 209-210
Author(s):  
Hui Shi ◽  
Wei Pan ◽  
Ming Hao Fang ◽  
Dan Xie
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Relative Dielectric Constant ◽  
Sodium Titanate ◽  
Solid State Reaction Method ◽  
Piezoelectric Constant ◽  
Reaction Method ◽  
Gel Method ◽  
Sol Gel Method

Bismuth sodium titanate ceramic was prepared by sol-gel method. The crystallization, density and microstructure were determined. The grains of BNT ceramic prepared by sol-gel method were equiaxial, ~ 2 µm, which was smaller than that prepared by solid-state reaction method. The piezoelectric and dielectric properties were investigated. When the sintering temperature was 1140°C, maximum relative dielectric constant and piezoelectric constant can be obtained. The piezoelectric constant of BNT ceramic prepared by sol-gel method was higher than those prepared by solid-state reaction method.

Luminescence of SrY2O4:Eu3+ associated with defects

2010 ◽  
Vol 25 (11) ◽  
pp. 2120-2124 ◽  
Author(s):  
Jia Zhang ◽  
Yuhua Wang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Vacuum Ultraviolet ◽  
Sol Gel ◽  
Blue Emission ◽  
Solid State Reaction Method ◽  
Excitation Spectra ◽  
Blue Emission Band ◽  
Gel Method ◽  
Sol Gel Method

SrY2O4:Eu3+ phosphors were synthesized by both the solid-state reaction method and the sol-gel method, and their photoluminescence in vacuum ultraviolet (VUV) and the ultraviolet (UV) region were evaluated. The excitation spectra of SrY2O4:Eu3+ phosphors prepared by solid-state reaction show another excitation band centered at 324 nm except for the charge-transfer bands (CTB) of Eu3+ when monitored at 610 nm, and a blue emission band around 406 nm is observed when excited at 324 nm, which could be associated with defects. Both the excitation and emission bands mentioned above disappear when the samples were prepared by the sol-gel method. SrY1.98O4:0.02Eu3+ phosphors synthesized by the sol-gel method exhibit a higher emission intensity under 147 nm excitation compared with solid-state reaction technology. The main reason could be that the samples prepared by the solution-based route have more regular and uniform morphologies.

Synthesis of Pure Dicalcium Silicate Powder by the Pechini Method and Characterization of Hydrated Cement

2014 ◽  
Vol 787 ◽  
pp. 387-394 ◽  
Author(s):  
Yan Ni Tan ◽  
Yong Liu ◽  
Zhang Qing ◽  
Gurpreet Birdi ◽  
Liam M. Grover
Keyword(s):  
Solid State ◽  
Mass Loss ◽  
Solid State Reaction ◽  
Pechini Method ◽  
Sol Gel ◽  
Dicalcium Silicate ◽  
Hydrated Cement ◽  
Gel Method ◽  
Sol Gel Method

Calcium silicate (CS) is a main component of Portland cement and is responsible for the strength development. Recent research has shown that dicalcium silicate cement (CSC) is bioactive and is a potential candidate for bone replacement. Traditionally, dicalcium silicate powder is synthesized by a solid state reaction or a sol-gel method. The solid-state reaction, however, usually needs a higher temperature and a longer calcination time. Furthermore, the dicalcium silicate powder made by the sol-gel method is not pure, and contains a significant quantity of CaO which is harmful to the strength and biological properties of the CSC. The Pechini technique is an alternative, low temperature polymeric precursor route for synthesis of high purity powders. In this study, purer CS powder was synthesized via the Pechini method by calcination at 800°C for 3h. DSC-TGA, XRD, SEM were used for characterization of CS powder and the hydrated cement. The DSC-TGA curves showed that the main exothermic peak was at 479°C and the total mass loss was 79.2%. The XRD patterns of CSC after hydration for 7, 14, and 35 days illustrated that dicalcium silicate hydrate (Ca1.5SiO3.5·xH2O, C-S-H) was formed in the hardened CS paste. The XRD peaks on the diffraction pattern of the C-S-H of the day 35 sample were of greater intensity than those at day 7 and day 14. This demonstrates that the hydration speed was slow and complete hydration could take more than one month. Flake-like crystals were observed on scanning electron micrographs following hardening. The degradation study result showed that there was no mass loss of CSC after the samples were soaked into phosphate buffered saline (PBS) for 40 days. The silicon assay revealed that orthosilicic acid could be released from CSC after the samples were soaked in simulated body fluid (SBF). Silicon is known to be critical to skeletal mineralization. The existence of silicon may stimulate the proliferation of bone and activate cells to produce bone. Investigation of cell attachment confirmed that the MC-3T3 cells attached well to the surfaces of CSC after seeding.

Photoluminescence and Electroluminescence Properties of (Ca,Sr)TiO3:Er

2016 ◽  
Vol 698 ◽  
pp. 60-65 ◽  
Author(s):  
Tôru Kyômen ◽  
Miyu Seki ◽  
Minoru Hanaya ◽  
Hiroshi Takashima
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Band Gap ◽  
Solid State Reaction ◽  
Spin Coating ◽  
Sol Gel ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Powder Samples ◽  
Coating Methods

Powder samples of (Ca,Sr)TiO3:Er were prepared by a solid-state reaction method. Photoluminescence due to f-f transitions of Er3+ was not induced by band-gap excitation of (Ca,Sr)TiO3 but by f-f transitions of Er3+. An electroluminescent device in which thin films of Ca0.6Sr0.4TiO3:Er and SnO2:Sb are stacked alternately was prepared by sol-gel and spin-coating methods. Very weak electroluminescence due to f-f transition of Er3+ was observed in the device.

scholarly journals Size-dependent optical and thermochromic properties of Sm3Fe5O12

RSC Advances ◽  
2017 ◽  
Vol 7 (60) ◽  
pp. 37765-37770 ◽  
Author(s):  
Huanhuan Liu ◽  
Long Yuan ◽  
Hui Qi ◽  
Yanyan Du ◽  
Shan Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Solid State Reaction Method ◽  
Inorganic Materials ◽  
Particle Sizes ◽  
Reaction Method ◽  
Size Dependent ◽  
Thermochromic Properties

Reversible thermochromic inorganic materials of Sm3Fe5O12with different particle sizes have been synthesized by a conventional high temperature solid state reaction method (2.51 μm) and sol–gel method (0.16 μm).

Photocurrent Enhancement for Ti-Doped Fe2O3 Thin Film Photoanodes by an In Situ Solid-State Reaction Method

2013 ◽  
Vol 5 (4) ◽  
pp. 1310-1316 ◽  
Author(s):  
Chunhui Miao ◽  
Tongfei Shi ◽  
Guoping Xu ◽  
Shulin Ji ◽  
Changhui Ye
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Fe2o3 Thin Film

Structure and Luminescence of Ba3MgSi2O8: Eu2+, Mn2+ Phosphors

2011 ◽  
Vol 399-401 ◽  
pp. 1016-1019
Author(s):  
Yue Li ◽  
Da Wei He ◽  
Yong Sheng Wang ◽  
Fu Ming ◽  
Yang Wu ◽  
...  
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Phase Change ◽  
Emission Spectrum ◽  
Solid State Reaction ◽  
Crystallization Temperature ◽  
Sol Gel ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Violet Light

In this paper, Ba3MgSi2O8: Eu2+, Mn2+ phosphor was synthesized by the sol-gel method and high temperature solid-state reaction method. The structure and emission spectrum excited by near violet light were investigated. we studied the process of phase change in roasting and determined the approximate crystallization temperature of Ba3MgSi2O8: Eu2+, Mn2+ phosphors. Our results demonstrate that 514 nm emission bands were from Eu2+ ions replacing of the sites of Ba2+ in Ba2SiO4. 440 nm emission bands originated from Eu2+ ions substituting the sites of Ba2+ in Ba3MgSi2O8, corresponded to 4f65d1→4f7 transition of Eu2+ ions. 615 nm emission bands ascribed to Mn2+ ions taking place of the sites of Mg2+ ions, corresponded to 4T→6A red launch of Mn2+ ions.

Synthesis and characterization of CeO2·α-Fe2O3 and CeO2·Pr6O11 ceramic pigments through the solid state reaction and modified sol–gel method

2014 ◽  
Vol 106 ◽  
pp. 14-19 ◽  
Author(s):  
Renata Cristina Olegário ◽  
Eder Carlos Ferreira de Souza ◽  
José Flávio Marcelino Borges ◽  
João Batista Marimon da Cunha ◽  
André Vitor Chaves de Andrade ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Ceramic Pigments ◽  
Gel Method ◽  
Sol Gel Method
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