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

Ashok Kumar; Subhash Thota; Sri Sivakumar; Shashank Priya; Jitendra Kumar

doi:10.1007/s10971-013-3132-4

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

Ashok Kumar, Subhash Thota, Sri Sivakumar, Shashank Priya, Jitendra Kumar

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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 ∼8.8 nm) at Ce content of 'x' = 0.20 in comparison to pure MgO (crystallite size ∼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.

Original language	English (US)
Pages (from-to)	46-53
Number of pages	8
Journal	Journal of Sol-Gel Science and Technology
Volume	68
Issue number	1
DOIs	https://doi.org/10.1007/s10971-013-3132-4
State	Published - Oct 2013
Externally published	Yes

Bibliographical note

Funding Information:
Acknowledgments Authors thank Institute of Critical Technology and Applied Sciences (ICTAS), Virginia Tech, for providing Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy facilities. This work was supported in part by SERB, Government of India (SB/FTP/ETA-243/2012).

Keywords

Ceramics
Inorganic materials
Optical absorption
Oxygen vacancies
Sol-gel

Publisher link

10.1007/s10971-013-3132-4

Find It

Find It at U of M Libraries

Cite this

@article{9aaaf12389454155b4ffea2deb368206,

title = "Sol-gel synthesis and optical behavior of Mg-Ce-O nano-crystallites",

abstract = "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 ∼8.8 nm) at Ce content of 'x' = 0.20 in comparison to pure MgO (crystallite size ∼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.",

keywords = "Ceramics, Inorganic materials, Optical absorption, Oxygen vacancies, Sol-gel",

author = "Ashok Kumar and Subhash Thota and Sri Sivakumar and Shashank Priya and Jitendra Kumar",

note = "Funding Information: Acknowledgments Authors thank Institute of Critical Technology and Applied Sciences (ICTAS), Virginia Tech, for providing Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy facilities. This work was supported in part by SERB, Government of India (SB/FTP/ETA-243/2012).",

year = "2013",

month = oct,

doi = "10.1007/s10971-013-3132-4",

language = "English (US)",

volume = "68",

pages = "46--53",

journal = "Journal of Sol-Gel Science and Technology",

issn = "0928-0707",

publisher = "Springer Netherlands",

number = "1",

}

TY - JOUR

T1 - Sol-gel synthesis and optical behavior of Mg-Ce-O nano-crystallites

AU - Kumar, Ashok

AU - Thota, Subhash

AU - Sivakumar, Sri

AU - Priya, Shashank

AU - Kumar, Jitendra

N1 - Funding Information: Acknowledgments Authors thank Institute of Critical Technology and Applied Sciences (ICTAS), Virginia Tech, for providing Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy facilities. This work was supported in part by SERB, Government of India (SB/FTP/ETA-243/2012).

PY - 2013/10

Y1 - 2013/10

N2 - 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 ∼8.8 nm) at Ce content of 'x' = 0.20 in comparison to pure MgO (crystallite size ∼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.

AB - 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 ∼8.8 nm) at Ce content of 'x' = 0.20 in comparison to pure MgO (crystallite size ∼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.

KW - Ceramics

KW - Inorganic materials

KW - Optical absorption

KW - Oxygen vacancies

KW - Sol-gel

UR - http://www.scopus.com/inward/record.url?scp=84887319378&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887319378&partnerID=8YFLogxK

U2 - 10.1007/s10971-013-3132-4

DO - 10.1007/s10971-013-3132-4

M3 - Article

AN - SCOPUS:84887319378

SN - 0928-0707

VL - 68

SP - 46

EP - 53

JO - Journal of Sol-Gel Science and Technology

JF - Journal of Sol-Gel Science and Technology

IS - 1

ER -

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

Abstract

Bibliographical note

Keywords

Publisher link

Find It

Other files and links

Fingerprint

Cite this