Sol-gel synthesis and optical behavior of Mg-Ce-O nano-crystallites

被引：7

作者：

Kumar, Ashok ^{[1
,2
,3
,4
]}

Thota, Subhash ^{[5
]}

Sivakumar, Sri ^{[6
]}

Priya, Shashank ^{[4
]}

Kumar, Jitendra ^{[3
]}

机构：

[1] Natl Inst Technol Kurukshetra, Dept Phys, Kurukshetra 136119, Haryana, India

[2] Natl Inst Technol Kurukshetra, Sch Mat Sci & Nanotechnol, Kurukshetra 136119, Haryana, India

[3] Indian Inst Technol Kanpur, Mat Sci Programme, Kanpur 208016, Uttar Pradesh, India

[4] Virginia Tech, CEHMS, Blacksburg, VA 24061 USA

[5] Indian Inst Technol, Dept Phys, Gauhati 781039, India

[6] Indian Inst Technol, Dept Chem Engn, Kanpur 208016, Uttar Pradesh, India

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2013年 / 68卷 / 01期

关键词：

Sol-gel; Optical absorption; Ceramics; Inorganic materials; Oxygen vacancies; ULTRAVIOLET-ABSORPTION SPECTRA; ENERGY-LOSS-SPECTROSCOPY; PROTECTIVE LAYER; ELECTRON; OXIDES; PURE;

D O I：

10.1007/s10971-013-3132-4

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The Mg-Ce-O powder are shown to contain periclase-type MgO and/or fluoride-type cerium oxide (CeO2) depending upon the composition (x) defined by Ce/(Ce + Mg) atomic ratio. Lattice contraction of pariclase phase of MgO (average crystallite size similar to 8.8 nm) at Ce content of 'x' = 0.20 in comparison to pure MgO (crystallite size similar to 9.5 nm) has been realized due to oxygen vacancy formation. The optical band gap values of CeO2 varies (3.0-3.2 eV) due to oxygen vacancy formation in CeO2 phase, crystallite size and/or Ce3+/Ce4+ ratio. Further, the addition of Ce has shown to reduce the physisorption and chemisorption of water significantly as reflected by (1) suppression of related absorption peaks and (2) absence of magnesium hydroxide, Mg(OH)(2), bands in Fourier transform infrared spectra.

引用

页码：46 / 53

页数：8

共 35 条

[1] Optical and electrical properties of electrochemically deposited polyaniline/CeO2 hybrid nanocomposite film [J].