NDLI: Thermal Behavior and Phase Transformation of TiO$_{2}$ Nanocrystallites Prepared by a Coprecipitation Route

Content Provider	Springer Nature Link
Author	Yeh, Shang Wei Chen, Yen Ling Hsi, Chi Shiung Ko, Horng Huey Wang, Moo Chin
Copyright Year	2013
Abstract	TiO$_{2}$ freeze-dried precursor powders were synthesized using a coprecipitation route that includes titanium tetrachloride (TiCl$_{4}$) as initial material prepared at 348 K (75 °C) and pH 7. Differential scanning calorimetry/thermogravimetry (DSC/TG), X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) and high resolution TEM were utilized to characterize the thermal behavior and phase transformation of the TiO$_{2}$ freeze-dried precursor powders after calcination. The main compound of the TiO$_{2}$ freeze-dried precursor powders was TiO$_{2}$·H$_{2}$O based on a TG analysis conducted at a heating rate of 20 K (20 °C)/min. The anatase TiO$_{2}$ (a-TiO$_{2}$) first appeared at 473 K (200 °C), then from a-TiO$_{2}$ transformed to rutile TiO$_{2}$ (r-TiO$_{2}$) at 773 K (500 °C). The activation energy of a-TiO$_{2}$ formation from TiO$_{2}$ freeze-dried precursor powders was 242.4 ± 33.9 kJ/mol, whereas, the activation energy of phase transformation from a-TiO$_{2}$ to r-TiO$_{2}$ was 267.5 ± 19.1 kJ/mol. The crystallite size of a-TiO$_{2}$ grew from 3.5 to 23.2 nm when raising the calcination temperature from 473 K to 873 K (200 °C to 600 °C). In addition, the crystallite size of r-TiO$_{2}$ increased from 17.4 to 48.1 nm when calcination temperature increased from 773 K to 1073 K (500 °C to 800 °C).
Starting Page	261
Ending Page	268
Page Count	8
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	45
Issue Number	1
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2013-08-30
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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