Evidence of different beta-phases in highly protonated z-cut H : LiNbO3 waveguides by raman scattering

Savatinova, I; Tonchev, S; Liarokapis, E; Armenise, MN; Armenise, M

dc.contributor.author	Savatinova, I	en
dc.contributor.author	Tonchev, S	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Armenise, MN	en
dc.contributor.author	Armenise, M	en
dc.date.accessioned	2014-03-01T01:48:52Z
dc.date.available	2014-03-01T01:48:52Z
dc.date.issued	1999	en
dc.identifier.issn	0947-8396	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25624
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	LINBO3 WAVE-GUIDES	en
dc.subject.other	STRUCTURAL-PROPERTIES	en
dc.subject.other	LITHIUM-NIOBATE	en
dc.subject.other	SPECTROSCOPY	en
dc.subject.other	LI1-XHXNBO3	en
dc.subject.other	EXCHANGE	en
dc.subject.other	H-LITAO3	en
dc.title	Evidence of different beta-phases in highly protonated z-cut H : LiNbO3 waveguides by raman scattering	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	In this paper, evidence of different B-phases in highly protonated z-cut H:LiNbO3 waveguides is demonstrated by the Raman scattering technique. Multimode waveguides have been produced by using pyrophosphoric, benzoic, and diluted benzoic acids as a proton source. The proton-exchanged (PE) layers are subjected to annealing (APE samples) with different rates of cooling: slow (s) and quick (q). The effect of Li-H replacing is considered in the frequency range below 800 cm(-1) and about 3500 cm(-1) (OH modes). The analysis of the spectral data leads to some important conclusions about the changes in the H:LiNbO3 lattice. We demonstrate that applying (s) <----> (q) procedures on HxLi1-xNbO3 waveguides with x > 0.56 leads to phase transitions between different states. The high-temperature phase modifications (metastable at room temperature) are characterized by strongly broadened q-Raman bands which imply a high degree of disorder. Although the Raman measurements support the presence of different phases in H:LiNbO3 waveguides, some conclusions, different from those reported elsewhere, have been made.	en
heal.publisher	SPRINGER VERLAG	en
heal.journalName	APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING	en
dc.identifier.isi	ISI:000082013200021	en
dc.identifier.volume	68	en
dc.identifier.issue	4	en
dc.identifier.spage	483	en
dc.identifier.epage	487	en