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Broad-band dielektric spectroscopy of relaxor ferroelectrics and multiferroics

Project goals

This project concerns broad-band dielectric spectroscopy and lattice dynamics of relaxor ferroelectrics and magnetoelectric multiferroics. The current study of relaxor ferroelectrics will be extended (ceramics and possibly crystals and/or films of PbSc1/2Ta1/2O3, PbMg1/3Nb2/3O3, PbMg1/3Ta2/3O3, Ba2LnTi2Nb3O15 (Ln=La,Nd), Sr0.61Ba0.39Nb2O6 and PLZT) and newly there will be investigated multiferroic Bi4Ti3O12 and SrBi2Nb2O9 and magnetoelectric multiferroics BiFeO3, PbFe2/3W1/3O3, EuTiO3, TbMnO3 and TbMn2O5. In relaxor ferroelectrics the research will be focused on the study of dynamics of polar nano-clusters (i.e. soft mode and high-frequency dielectric dispersion) in dependence of temperature mainly near the Burns temperature, where the clusters are formed. Low-frequency dielectric response and spontaneous polarization of magnetoelectrics will be studied in dependence of magnetic field, whereas the lattice dynamics so far without the magnetic field. For covering the frequency range from 100 Hz

Keywords

dielectric spectroscopylattice dynamicsferroelectricsmagnetoelectric multiferroicsinfrared

Public support

  • Provider

    Czech Science Foundation

  • Programme

    Standard projects

  • Call for proposals

    Standardní projekty 9 (SGA02006GA-ST)

  • Main participants

  • Contest type

    VS - Public tender

  • Contract ID

    202/06/0403

Alternative language

  • Project name in Czech

    Širokopásmová dielektrická spektroskopie relaxačních feroelektrik a multiferoik

  • Annotation in Czech

    Tento projekt se týká širokopásmové dielektrické spektroskopie a dynamiky krystalové mřížky relaxačních feroelektrik a magnetoelektrických multiferoik. Bude rozšířeno stávající studium relaxačních feroelektrik (keramiky, popřípadě monokrystaly či vrstvyPbSc1/2Ta1/2O3, PbMg1/3Nb2/3O3, PbMg1/3Ta2/3O3, Ba2LnTi2Nb3O15 (Ln=La, Nd), Sr0.61Ba0.39Nb2O6 a PLZT) a nově budou studovány multiferoické Bi4Ti3O12 a SrBi2Nb2O9 a magnetoelektrická multiferoika s feroelektrickým i magnetickým uspořádáním BiFeO3, PbFe2/3W1/3O3, EuTiO3, TbMnO3 a TbMn2O5 V relaxačních feroelektrikách bude kladen důraz na studium dynamiky polárních nanoklastrů (tj. měkkého módu a vysokofrekvenční dielektrické disperze) v závislosti na teplotě především v okolí Burnsovy teploty, při které se klastry tvoří. Nízkofrekvenční dielektrická odezva a spontální polarizace magnetoelektrik bude studována v závislosti na magnetickém poli, zatímco dynamika mřížky magnetoelektrik bude studována zatím bez magnetického pole. Pro pokrytí

Scientific branches

  • R&D category

    ZV - Basic research

  • CEP classification - main branch

    BM - Solid-state physics and magnetism

  • CEP - secondary branch

  • CEP - another secondary branch

  • 10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Completed project evaluation

  • Provider evaluation

    V - Vynikající výsledky projektu (s mezinárodním významem atd.)

  • Project results evaluation

    We have shown, on the base of study of many relaxor ferroelectrics that a giant dielectric dispersion in these materials is caused by a dynamics of polar nanoclusters, which are created at Burns temperature Td, i.e. typically 300 - 400 K above temperatur

Solution timeline

  • Realization period - beginning

    Jan 1, 2006

  • Realization period - end

    Dec 31, 2008

  • Project status

    U - Finished project

  • Latest support payment

    Apr 25, 2008

Data delivery to CEP

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

  • Data delivery code

    CEP09-GA0-GA-U/02:2

  • Data delivery date

    Oct 22, 2009

Finance

  • Total approved costs

    4,065 thou. CZK

  • Public financial support

    4,065 thou. CZK

  • Other public sources

    0 thou. CZK

  • Non public and foreign sources

    0 thou. CZK

Basic information

Recognised costs

4 065 CZK thou.

Public support

4 065 CZK thou.

100%


Provider

Czech Science Foundation

CEP

BM - Solid-state physics and magnetism

Solution period

01. 01. 2006 - 31. 12. 2008