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001-es BibID:	BIBFORM121354
035-os BibID:	(WoS)001235541500006 (Scopus)85190999126
Első szerző:	Bin Anooz, Saud
Cím:	Dielectric function and interband critical points of compressively strained ferroelectric K0.85Na0.15NbO3 thin film with monoclinic and orthorhombic symmetry / Saud Bin Anooz, Peter Petrik, Yankun Wang, Deshabrato Mukherjee, Martin Schmidbauer, Jutta Schwarzkopf
Dátum:	2024
ISSN:	1094-4087
Megjegyzések:	he dielectric function and interband critical points of compressively strained ferroelectric K0.85Na0.15NbO3 thin film grown by metal-organic vapor phase epitaxy (MOVPE) are studied in broad spectral and temperature ranges by spectroscopic ellipsometry (SE). The temperature dependence of the measured pseudodielectric functions is strongly affected by a structural phase transition from the monoclinic Mc-phase to the orthorhombic c-phase at about 428 K. Using a parametric optical constant model, the corresponding dielectric functions as well as the interband optical transitions of the film are determined in the spectral range of 0.73?6.00 eV. Standard critical point (SCP) analysis of the 2nd derivatives of the dielectric functions identified three and four critical points for monoclinic and orthorhombic symmetries, respectively. A systematic redshift of the threshold energies with increasing temperatures was observed.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Ferroelectric films Ferroelectricity Niobium compounds Organometallics Sodium compounds Spectroscopic ellipsometry Temperature distribution
Megjelenés:	Optics Express. - 32 : 9 (2024), p. 1-13. -
További szerzők:	Petrik Péter Wang, Yankun Mukherjee, Deshabrato Schmidbauer, Martin Schwarzkopf, Jutta
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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