文献类型：期刊文献

英文题名：Effect of annealing temperature on the structural and solar heat shielding performance of NiTiO3 nanopowder

作者：Tursun, Rabigul Tan, Jiang Yu, Qiushan Su, Yuchang Xiao, Lihua

第一作者：Tursun, Rabigul

通信作者：Su, YC[1]

机构：[1]Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

通信机构：corresponding author), Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.

年份：2018

卷号：159

起止页码：697-703

外文期刊名：SOLAR ENERGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000423007300066)】；

语种：英文

外文关键词：NiTiO3; Sol-gel; Orbital splitting; Solar heat shielding

摘要：Nickel titanate (NiTiO3) is a bimetallic oxide with potential applications in solar heat shielding coatings. Most prior researches have focused on the photocatalytic behavior of NiTiO3 but are limited to explore on reflective performance. In the paper, NiTiO3 ultrafine nanopowders were synthesized by the sol-gel method. Thermogravimetric and differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and UV-Vis-NIR-DR spectro-photometry were employed to investigate the structural and optical properties of samples at different treatment temperatures. The average crystal size of synthesized NiTiO3 powder in 500-900 degrees C regions was found to be 13.8 +/- 0.02-80.2 +/- 0.06 nm. Ultraviolet visible (UV vis) near infrared (NIR) diffuse reflectance spectra study showed that synthesized at 500 degrees C for 10 h NiTiO3 nanoparticles showed higher solar reflection of 40.5 +/- 0.04% in the NIR region (700-2500 nm) than other temperature samples according to particular computational formulation with experimental results. The solar reflective ability in the NIR region of NiTiO3 powders was found to be decrease as treatment temperature increased. Temperature higher than 700 degrees C, results showed further crystallization of NiTiO3, due to Ni2+ ion d-d transitions ((3)A(sg) -> T-3(lg)(P)) and transfer of amorphous NiTiO3 structure to an ilmenite structure. These results indicate that when annealing temperature is increased the microstructure and crystal size of NiTiO3 powders are altered and the performance of optical reflection is changed.