Universal Dielectric Response in Electronically Correlated Functional Oxides CaCu 3 Ti 4 O 12 , LaFeO 3 , YFe 0.5 Cr 0.5 O 3 and their Nanocomposites: A Comparative Study

• Published in: ChemistrySelect (Weinheim) Vol. 9; no. 15
• Main Authors: Bhattacharya, Sudipa, Yadav, Preeti, Singh, Manoj K., Vasundhara, M., Gayen, Arup, Kundu, Asish K., Seikh, Md. Motin
• Format: Journal Article
• Language: English
• Published: 18-04-2024
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202400126

CaCu
3
Ti
4
O
12
(CCTO), LaFeO
3
(LFO) and YFe
0.5
Cr
0.5
O
3
(YFCO) were synthesized via conventional sol–gel auto–combustion method using citric acid as gelling agent. The X‐ray diffraction analysis revealed the phase purity of the samples. The energy dispersive X‐ray (EDX) analysis confirms the stoichiometry of the pristine phases. The average particle size obtained from the field emission Scanning electron microscopy (FE−SEM) images revealed that CaCu
3
Ti
4
O
12
exhibits a broad range of particle size starting from a couple of hundreds of nanometer to micrometer, whereas that for LaFeO
3
and YFe
0.5
Cr
0.5
O
3
are about 110 nm and 50 nm, respectively. We have fabricated the new composites: CCTO–LFO, CCTO–YFCO and LFO–YFCO. The grain sizes of the composite phases are consistent with the pristine phases as they are prepared by at lower sintering temperatures and duration. The dielectric properties of these ceramic composites were compared to those of the pristine phases. The temperature and frequency dependent dielectric measurements reveal a wide range of dielectric constant with moderate tan δ values. The temperature dependent dielectric constant of the investigated samples varies from 100 to 1500 at room temperature and the data have been analyzed using universal dielectric response (UDR) model.