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Titolo:
Phase transformation in the surface region of zirconia detected by UV Raman spectroscopy
Autore:
Li, MJ; Feng, ZH; Xiong, G; Ying, PL; Xin, Q; Li, C;
Indirizzi:
Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China Chinese Acad Sci Dalian Peoples R China 116023 n 116023, Peoples R China
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 34, volume: 105, anno: 2001,
pagine: 8107 - 8111
SICI:
1520-6106(20010830)105:34<8107:PTITSR>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
SULFATED ZIRCONIA; ZRO2; CATALYSTS; STABILITY; ION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Li, C Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, POB 110,Dalian 116023, Peoples R China Chinese Acad Sci POB 110 Dalian Peoples R China 116023 ples R China
Citazione:
M.J. Li et al., "Phase transformation in the surface region of zirconia detected by UV Raman spectroscopy", J PHYS CH B, 105(34), 2001, pp. 8107-8111

Abstract

The phase transformation of zirconia from tetragonal to monoclinic is characterized by UV Raman spectroscopy, visible Raman spectroscopy, and XRD. Electronic absorption Of ZrO2 in the UV region makes UV Raman spectroscopy more sensitive at the surface region than XRD or visible Raman spectroscopy. Zirconia changes from the tetragonal phase to the monoclinic phase with calcination temperatures elevated and monoclinic phase is always detected first by UV Raman spectroscopy for the samples calcined at lower temperatures than that by XRD and visible Raman spectroscopy. When the phase of zirconia changes from tetragonal to monoclinic, the slight changes of the phase at very beginning can be detected by UV Raman spectroscopy. UV Raman spectra clearly indicate that the phase transition takes place initially at the surface regions. It is found that the phase change from tetragonal to monoclinicis significantly retarded when amorphous Zr(OH)(4) was agglomerated to bigger particles and the particle agglomeration of amorphous zirconium hydroxide is beneficial to the stabilization of t-ZrO2 phase.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 22:51:35