Raman and infrared spectroscopic investigations on the crystal structure and phonon modes of LaYbO3 ceramics

MOREIRA, R L, FETEIRA, Antonio and DIAS, A (2005). Raman and infrared spectroscopic investigations on the crystal structure and phonon modes of LaYbO3 ceramics. Journal of Physics - Condensed Matter, 17 (17), 2775-2781.

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Official URL: http://dx.doi.org/10.1088/0953-8984/17/17/027
Link to published version:: https://doi.org/10.1088/0953-8984/17/17/027
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    Abstract

    LaYbO3 is a highly distorted perovskite with orthorhombic structure. However, its exact space group has been a matter of debate. Both the polar Pna2(1) and the centrosymmetric Pnma space groups, with Z = 4, have been proposed to describe its structure at room temperature. In this work we present optical spectroscopic investigations by Raman scattering and infrared reflectivity of LaYbO3 ceramics sintered at 1600 degrees C. The results allowed us to propose a new centrosymmetric Cmcm space group for this compound, and to show which phonons give the main contributions to its dielectric constant and quality factor at microwave frequencies.

    Item Type: Article
    Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
    Identification Number: https://doi.org/10.1088/0953-8984/17/17/027
    Page Range: 2775-2781
    Depositing User: Hilary Ridgway
    Date Deposited: 07 Jun 2012 10:50
    Last Modified: 12 Oct 2018 12:23
    URI: http://shura.shu.ac.uk/id/eprint/5355

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