Synthesis, characterization and wide range frequency and temperature dependent electrical modulus study of LaCrO3 and cobalt (Co) doped LaCrO3 perovskite compounds
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F19%3APU135260" target="_blank" >RIV/00216305:26210/19:PU135260 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0921510719302132" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921510719302132</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.mseb.2019.114410" target="_blank" >10.1016/j.mseb.2019.114410</a>
Alternative languages
Result language
angličtina
Original language name
Synthesis, characterization and wide range frequency and temperature dependent electrical modulus study of LaCrO3 and cobalt (Co) doped LaCrO3 perovskite compounds
Original language description
We synthesized the undoped lanthanum chromium oxide, LaCrO3 (LCO), and cobalt (Co) doped LaCr1-xCoxO3 (LCCO), (x = 0.01, 0.10, 0.15, 0.20, 0.30) perovskite compounds using solid-state reaction method. Electrical modulus of the samples was investigated at a wide range frequency and temperature using precision temperature controlled dielectric/impedance spectroscopy in nitrogen ambient. Structural and chemical analyses were carried out using SEM, XRD, FTIR and XPS. SEM images showed that particle sizes are shrinking depend on Co doping ratio. The XRD results revealed that the strongest peak shifts through higher two theta values due to difference ionic radii of Co and Cr. From the FTIR analysis, the bending vibration of O-Cr-O bonding and stretching vibration of Cr-O bonding were observed 600-530 cm(-1) and 500-450 cm(-1) band regions, respectively. Our XPS studies have exhibited that the oxidation state of Cr is mixed with metallic (0), (3 +), (4 +) and (6 +), Co has (2 +) and (3 +) oxidation states and La has only (3 +) oxidation state. Frequency-dependent real and imaginary part of electrical modulus characteristics were performed for all samples and the results showed that there are two relaxation processes taking place at the grain and grain boundary, for LCO, 1% and 10% Co doped LCO samples. Nonetheless, 15, 20 and 30% Co doped LCO samples demonstrate three relaxation processes, which are due to the dc conductivity, grain and grain boundary. The activation energy of the samples were calculated using log (f(max)) & 1000/T plot and the results showed that the activation energy highly depends on the Co doping ratio.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
—
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
ISSN
0921-5107
e-ISSN
1873-4944
Volume of the periodical
248
Issue of the periodical within the volume
1
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
14
Pages from-to
1-14
UT code for WoS article
000487167600010
EID of the result in the Scopus database
—