Identifying the nature of dielectric anomalies in SrFeO3-delta

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10425344" target="_blank" >RIV/00216208:11320/19:10425344 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=OoUcoXI1Go" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=OoUcoXI1Go</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmmm.2019.165265" target="_blank" >10.1016/j.jmmm.2019.165265</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Identifying the nature of dielectric anomalies in SrFeO3-delta

Popis výsledku v původním jazyce

Earlier comprehensive study of SrFeO3-delta series of compounds showed interplay between the oxygen vacancy and the magnetic and transport properties of the system. We have synthesized a powder sample of SrFeO3-delta series with oxygen vacancy in the range 0.15 &lt;= delta &lt;= 0.19. X-ray powder diffraction confirms the tetragonal crystal structure of the compound while the magnetic data indicates the presence of response from both orthorhombic (Sr4Fe4O11) and tetragonal (Sr8Fe8O23) phases which is common for the series with intermediate compositions. The temperature dependent dielectric measurements have been carried out in the 10 kHz-1 MHz frequency range. The dielectric constant and loss are found to be nearly temperature independent for Delta T similar to 170 K around room temperature. This temperature independent response could possibly be referred to as &apos;flat loss&apos; corresponding to a low loss behavior, making the compound a potential candidate to capacitor industry. The anion stoichiometry has been further manipulated by introducing a more electronegative fluoride anion in the vacant oxygen sites where the structure changes to cubic one at room temperature.

Název v anglickém jazyce

Identifying the nature of dielectric anomalies in SrFeO3-delta

Popis výsledku anglicky

Earlier comprehensive study of SrFeO3-delta series of compounds showed interplay between the oxygen vacancy and the magnetic and transport properties of the system. We have synthesized a powder sample of SrFeO3-delta series with oxygen vacancy in the range 0.15 &lt;= delta &lt;= 0.19. X-ray powder diffraction confirms the tetragonal crystal structure of the compound while the magnetic data indicates the presence of response from both orthorhombic (Sr4Fe4O11) and tetragonal (Sr8Fe8O23) phases which is common for the series with intermediate compositions. The temperature dependent dielectric measurements have been carried out in the 10 kHz-1 MHz frequency range. The dielectric constant and loss are found to be nearly temperature independent for Delta T similar to 170 K around room temperature. This temperature independent response could possibly be referred to as &apos;flat loss&apos; corresponding to a low loss behavior, making the compound a potential candidate to capacitor industry. The anion stoichiometry has been further manipulated by introducing a more electronegative fluoride anion in the vacant oxygen sites where the structure changes to cubic one at room temperature.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

—

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Magnetism and Magnetic Materials

ISSN

0304-8853

e-ISSN

—

Svazek periodika

486

Číslo periodika v rámci svazku

Sep

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

165265

Kód UT WoS článku

000471859200014

EID výsledku v databázi Scopus

2-s2.0-85065829848