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Phonons and relaxations in unfilled tetragonal tungsten-bronzes

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00553887" target="_blank" >RIV/68378271:_____/21:00553887 - isvavai.cz</a>

  • Result on the web

    <a href="http://perovskitesandotherfws.co-ac.com" target="_blank" >http://perovskitesandotherfws.co-ac.com</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.23647/ca.md20191227" target="_blank" >10.23647/ca.md20191227</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Phonons and relaxations in unfilled tetragonal tungsten-bronzes

  • Original language description

    The lead-free unfilled tetragonal tungsten-bronzes SBN and CBN had been studied by Raman, infrared and high-frequency dielectric spectroscopies to understand the origin of the phase transition. The substitution in the different channels affects phonon parameters as well as relaxations. Identification of the external modes was done by aid of site group analysis of the structure and respective Raman and IR spectra. It is shown that CBN can show also a small Ca occupancy in the pentagonal channels. Relaxations in SBN show similar qualitative behaviour on increasing Sr content and relaxor behaviour, but for the extreme relaxor samples all frequencies are higher, and the contribution to the permittivity of excitations at GHz-THz range is much stronger. The presence of a soft anharmonic central mode at THz range, and the slowing down of a relaxation at GHz-MHz ranges reveals the coexistence of displacive and order-disorder mechanisms of the phase transition in these materials.

  • Czech name

  • Czech description

Classification

  • Type

    C - Chapter in a specialist book

  • CEP classification

  • OECD FORD branch

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

Result continuities

  • Project

    <a href="/en/project/GA16-09142S" target="_blank" >GA16-09142S: Lattice dynamics and dielectric response of tetragonal tungsten-bronze oxides</a><br>

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2021

  • Confidentiality

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

Data specific for result type

  • Book/collection name

    Perovskites and other framework structure crystalline materials: new trends and perspectives

  • ISBN

    979-8583096497

  • Number of pages of the result

    26

  • Pages from-to

    281-306

  • Number of pages of the book

    821

  • Publisher name

    Collaborating Academics

  • Place of publication

    Frontignan

  • UT code for WoS chapter