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Tesar K, Gregora I, Beresova P, Vanek P, Ondrejkovic P, Hlinka J. Raman scattering yields cubic crystal grain orientation. Sci Rep 2019; 9:9385. [PMID: 31253866 PMCID: PMC6599203 DOI: 10.1038/s41598-019-45782-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 06/14/2019] [Indexed: 12/04/2022] Open
Abstract
The paper proposes a fully optical method for determination of a cubic crystal grain orientation in a sample inspected by a Raman microscope. The method is based on a universal and strong polarisation anisotropy of the Raman scattering by doubly degenerate optic phonon modes and it only requires a standard Raman microscope equipped with a polarisation analysis. Explicit formulas for the orientation of the crystal grain are derived. The feasibility of the approach is demonstrated by comparing grain orientations in a polycrystalline cubic lacunar spinel GaV4S8 determined independently using electron backscatter diffraction and Raman scattering methods.
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Affiliation(s)
- K Tesar
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague 8, 182 21, Czech Republic.,Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, Praha 2, 120 00, Czech Republic
| | - I Gregora
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - P Beresova
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - P Vanek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - P Ondrejkovic
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague 8, 182 21, Czech Republic
| | - J Hlinka
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, Prague 8, 182 21, Czech Republic.
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Hlinka J, Ostapchuk T, Buixaderas E, Kadlec C, Kuzel P, Gregora I, Kroupa J, Savinov M, Klic A, Drahokoupil J, Etxebarria I, Dec J. Multiple soft-mode vibrations of lead zirconate. Phys Rev Lett 2014; 112:197601. [PMID: 24877964 DOI: 10.1103/physrevlett.112.197601] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Indexed: 06/03/2023]
Abstract
Polarized Raman, IR, and time-domain THz spectroscopy of orthorhombic lead zirconate single crystals have yielded a comprehensive picture of temperature-dependent quasiharmonic frequencies of its low-frequency phonon modes. It is argued that these modes primarily involve vibrations of Pb ions and librations of oxygen octahedra. Their relation to phonon modes of the parent cubic phase is proposed. Counts of the observed IR and Raman active modes belonging to distinct irreducible representations agree quite well with group-theory predictions. Analysis of the results yields insight into the phase transition mechanism, involving a soft ferroelectric branch coupled by a trilinear term to another two oxygen octahedra tilt modes.
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Affiliation(s)
- J Hlinka
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - T Ostapchuk
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - E Buixaderas
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - C Kadlec
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - P Kuzel
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - I Gregora
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - J Kroupa
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - M Savinov
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - A Klic
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - J Drahokoupil
- Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - I Etxebarria
- Zientzia eta Teknologia Fakultatea, Euskal Herriko Unibertsitatea, P.K. 644, 48080 Bilbao, Spain
| | - J Dec
- Institute of Materials Science, University of Silesia, Bankowa 12, PL-40-007 Katowice, Poland
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Tyunina M, Dejneka A, Rytz D, Gregora I, Borodavka F, Vondracek M, Honolka J. Ferroelectricity in antiferroelectric NaNbO3 crystal. J Phys Condens Matter 2014; 26:125901. [PMID: 24594846 DOI: 10.1088/0953-8984/26/12/125901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Sodium niobate (NaNbO3, or NNO) is known to be antiferroelectric at temperatures between 45 and 753 K. Here we show experimentally the presence of the ferroelectric phase at temperatures between 100 and 830 K in the NNO crystals obtained by top-seeded solution growth. The ferroelectric phase and new phase transitions are evidenced using a combination of thermo-optical studies by variable angle spectroscopic ellipsometry, Raman spectroscopy analysis, and photoelectron emission microscopy. The possibility for strain-induced ferroelectricity in NNO is suggested.
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Affiliation(s)
- M Tyunina
- Microelectronics and Materials Physics Laboratories, University of Oulu, PO Box 4500, FI-90014 Oulun yliopisto, Finland. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
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Borodavka F, Simon E, Gregora I, Kamba S, Haumont R, Hlinka J. Lattice modes in paraelectric La1/2Na1/2TiO3 by infrared and Raman spectroscopy. J Phys Condens Matter 2013; 25:085901. [PMID: 23360927 DOI: 10.1088/0953-8984/25/8/085901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The lattice dynamics of La(1/2)Na(1/2)TiO(3) single crystal have been investigated by far-infrared and Raman scattering spectroscopy. Far-IR reflectivity spectra revealed Slater, Last and Axe modes near 140, 190 and 555 cm(-1), respectively. The frequency of the Slater mode decreases by about 10% on cooling, which is enough to account for the observed increase of the low-frequency permittivity. The results allowed us to discuss the reasons for the suppressed ferroelectricity of the material. Temperature evolution of the Raman scattering intensity of an oxygen octahedra bending mode near 455 cm(-1) suggests a second-order phase transition towards the perovskite aristotype phase near 870 K.
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Affiliation(s)
- F Borodavka
- Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
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Glazer AM, Zhang N, Bartasyte A, Keeble DS, Huband S, Thomas PA, Gregora I, Borodavka F, Margueron S, Hlinka J. LiTaO3crystals with near-zero birefringence. J Appl Crystallogr 2012. [DOI: 10.1107/s0021889812035121] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A study of vapour transport equilibrated crystals of LiTaO3shows periodic fringes that change with temperature. The origin of these fringes and their behaviour is explained in terms of domains with slanted walls. Micro-Raman measurements have been used to determine the Li2O concentration through the crystals, and by comparison with the observed fringe pattern the variation of birefringence with Li2O content has been determined.
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Kment S, Hubicka Z, Kmentova H, Kluson P, Krysa J, Gregora I, Morozova M, Cada M, Petras D, Dytrych P, Slater M, Jastrabik L. Photoelectrochemical properties of hierarchical nanocomposite structure: Carbon nanofibers/TiO2/ZnO thin films. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.10.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Goian V, Kamba S, Nuzhnyy D, Vaněk P, Kempa M, Bovtun V, Knížek K, Prokleška J, Borodavka F, Ledinský M, Gregora I. Dielectric, magnetic and structural properties of novel multiferroic Eu(0.5)Ba(0.5)TiO(3) ceramics. J Phys Condens Matter 2011; 23:025904. [PMID: 21406850 DOI: 10.1088/0953-8984/23/2/025904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Dielectric properties of Eu(0.5)Ba(0.5)TiO(3) ceramics were investigated between 10 and 300 K in the frequency range of 1 MHz-100 THz. Permittivity exhibits a strong peak near the ferroelectric phase transition at 215 K. This is mainly due to softening of the lowest frequency polar phonon revealed in THz and infrared spectra. Dielectric relaxation was observed also below the ferroelectric soft mode frequency in the whole investigated temperature region, but it is probably caused by some defects such as Eu(3 + ) cations or oxygen vacancies. This implies that the ferroelectric phase transition has predominantly a displacive character. Raman scattering spectra revealed a lowering of crystal symmetry in the ferroelectric phase and XRD analysis indicated orthorhombic A2mm symmetry below 215 K. The magnetic measurements performed at various frequencies in the field cooled and field heating regime after cooling in zero magnetic fields excluded spin glass behavior and proved an antiferromagnetic order below 1.9 K in Eu(0.5)Ba(0.5)TiO(3).
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Affiliation(s)
- V Goian
- Institute of Physics ASCR, Na Slovance 2, 182 21, Prague 8, Czech Republic
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Ciepielewski P, Gregora I, Vorlicek V. Raman scattering in CdF2:In crystals. Phys Rev B Condens Matter 1990; 42:11665-11669. [PMID: 9995470 DOI: 10.1103/physrevb.42.11665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Vorlek V, Gregora I, Kauschke W, Menéndez J, Cardona M. Raman scattering by the coupled plasmon-LO-phonon modes near the E0+ Delta 0 gap of n-type GaAs: Resonance and interference effects. Phys Rev B Condens Matter 1990; 42:5802-5808. [PMID: 9996166 DOI: 10.1103/physrevb.42.5802] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Riede V, Sobotta H, Neumann H, Gregora I, Kamba S, Vorliček V. Infrared optical characterization of epitaxial layer – substrate systems (II). Experimental results for AlxGa1−xAs/GaAS. Cryst Res Technol 1989. [DOI: 10.1002/crat.2170240913] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ciepielewski P, Kalinski Z, Gregora I, Vorlicek V. Two-magnon Raman scattering in CdxMn1-xF2 mixed crystals. Phys Rev B Condens Matter 1988; 37:472-475. [PMID: 9943598 DOI: 10.1103/physrevb.37.472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Gregora I, Vorlíček V, Uecker R. Determination of the Fresnel Indicatrix of the Monoclinic NaVO3 Crystal in the Visible and Near Infrared Spectral Range. ACTA ACUST UNITED AC 1983. [DOI: 10.1002/pssa.2210790221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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