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The phase stability of nanocrystalli...

Zhang, Feng.

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The phase stability of nanocrystalline ceria, zirconia, and their binary system.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The phase stability of nanocrystalline ceria, zirconia, and their binary system./
作者:	Zhang, Feng.
面頁冊數:	212 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6286.
Contained By:	Dissertation Abstracts International64-12B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3115379

The phase stability of nanocrystalline ceria, zirconia, and their binary system.
Zhang, Feng.

The phase stability of nanocrystalline ceria, zirconia, and their binary system. - 212 p.

Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6286.

Thesis (Ph.D.)--Columbia University, 2004.

Chapter 1. Introduction. A general introduction to the physical properties, redox reactions, and various applications of ceria is presented, highlighting that the nanocrystalline CeO2 shows different properties from its micon-sized counterparts. Although possessing a simple cubic fluorite structure, cerium oxide is a complicate material because of the internal and/or external point defects in the system, especially in the nanometer scale. After being applied by industry for more than a decade, some basic science behind its applications of ceria remains unclear. It is of great interest to study nanocrystalline CeO2.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

The phase stability of nanocrystalline ceria, zirconia, and their binary system.
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245 1 4 $a The phase stability of nanocrystalline ceria, zirconia, and their binary system.
300 $a 212 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6286.
500 $a Adviser: Siu-Wai Chan.
502 $a Thesis (Ph.D.)--Columbia University, 2004.
520 $a Chapter 1. Introduction. A general introduction to the physical properties, redox reactions, and various applications of ceria is presented, highlighting that the nanocrystalline CeO2 shows different properties from its micon-sized counterparts. Although possessing a simple cubic fluorite structure, cerium oxide is a complicate material because of the internal and/or external point defects in the system, especially in the nanometer scale. After being applied by industry for more than a decade, some basic science behind its applications of ceria remains unclear. It is of great interest to study nanocrystalline CeO2.
520 $a Chapter 2. Synthesis and characterization of nanocrystalline cerium oxide. Nanoparticles of ceria oxide with a narrow size distribution were prepared by mixing cerium nitrate and hexamethylenetetramine solutions. The lattice parameter increases up to 0.45% as the particle size decreases to 6 nm, as observed with x-ray diffraction (XRD).
520 $a Chapter 3. Cerium oxidation state in ceria nanoparticles studied with x-ray photoelectron spectroscopy and absorption near edge spectrocopy . X-ray photoelectron spectroscopy and x-ray absorption near edge spectroscopy experiments were used to investigate the oxidation state of cerium ions in ceria nanoparticles. A comparison of results shows that XPS yields a higher concentration of Ce3+ ions, even after analysis with a core-shell model comprising an external oxide layer.
520 $a Chapter 4. Ceria nanoparticles: Size, distribution, and shape. Nanocrystalline ceria particles have been prepared by nixing aqueous solutions of cerium nitrate and hexamethylenetetramine at room temperature. The smallest size of nanoparticles synthesized is 2 nm.
520 $a Chapter 5. The stability of the cubic phase (c ') in (1-x)CeO2-xZrO 2 nanoparticles. The stability of the cubic phase (c ') of Ce1-xZrxO2-y was studied by x-ray diffraction (XRD), time-resolved high temperature XRD, transmission electron microscopy, Raman spectroscopy, Ce LIII, and Zr LIII edge x-ray absorption spectroscopy. With decreasing particle size, the extended-cubic (c')-tetragonal phase boundary was observed to shift to higher zirconium concentrations (i.e. 40--60% dependent on particle size).
520 $a Chapter 6. In-situ study of the crystallization transition from amorphous to cubic zirconium oxide: Rietveld and reversed Monte Carlo analysis. High-energy synchrotron x-eay with wavelength of 0.124123 A was applied to study the amorphous-to-cubic phase transformation of nano-ZrO2 in a reducing environment. (Abstract shortened by UMI.)
590 $a School code: 0054.
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0794
710 2 0 $a Columbia University. $3 571054
773 0 $t Dissertation Abstracts International $g 64-12B.
790 1 0 $a Chan, Siu-Wai, $e advisor
790 $a 0054
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3115379