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Titolo:
Wall-related Raman scattering in ferroelastic lead phosphate Pb-3(PO4)(2)
Autore:
Mihailova, B; Bismayer, U; Engelhardt, A; Guttler, B;
Indirizzi:
Univ Hamburg, Mineral Petrog Inst, D-20146 Hamburg, Germany Univ Hamburg Hamburg Germany D-20146 trog Inst, D-20146 Hamburg, Germany Bulgarian Acad Sci, Cent Lab Mineral & Crystallog, BU-1113 Sofia, BulgariaBulgarian Acad Sci Sofia Bulgaria BU-1113 allog, BU-1113 Sofia, Bulgaria Univ Hannover, Inst Mineral, D-30167 Hannover, Germany Univ Hannover Hannover Germany D-30167 ineral, D-30167 Hannover, Germany Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany Phys Tech Bundesanstalt Braunschweig Germany D-38116 aunschweig, Germany
Titolo Testata:
JOURNAL OF PHYSICS-CONDENSED MATTER
fascicolo: 41, volume: 13, anno: 2001,
pagine: 9383 - 9392
SICI:
0953-8984(20011015)13:41<9383:WRSIFL>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-DIFFRACTION; MESOSCOPIC STRUCTURES; TWIN WALLS; SILICATE-GLASSES; DOMAIN-WALLS; NEEDLE TWINS; CRYSTALS; TRANSITIONS; THICKNESS; MODE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Mihailova, B Univ Hamburg, Mineral Petrog Inst, Grindelallee 48, D-20146 Hamburg, Germany Univ Hamburg Grindelallee 48 Hamburg Germany D-20146 Germany
Citazione:
B. Mihailova et al., "Wall-related Raman scattering in ferroelastic lead phosphate Pb-3(PO4)(2)", J PHYS-COND, 13(41), 2001, pp. 9383-9392

Abstract

Micro-Raman spectroscopy is applied to study structural changes in the vicinity of the domain walls in ferroelastic lead phosphate Pb-3(PO4)(2). The Raman spectra measured in untwinned and in heavily twinned regions of monoclinic Pb-3(PO4)(2) are studied and the observed differences are analysed onthe basis of calculated vibrational modes of monoclinic structural units with different atomic arrangements. The wall-related Raman signals observed near 537, 65 and 51 cm(-1) result from static displacements of the Pb-2 atoms along the monoclinic binary axis. PO4 tetrahedra of rhombohedral geometry can also contribute to the extra Raman scattering near 537 cm(-1). The deviations of the Pb-2 atoms from their monoclinic positions couple preferably within the Pb-2-O sheets parallel to the cleavage plane. Rearrangements of the Pb-2 atoms occurring across the domain walls affect the intensity ratios between out-of-plane and in-plane components of nu (4)(PO4) bending, PO4 rotational and PO4 translational modes.

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Documento generato il 29/03/20 alle ore 14:09:22