Universal Dielectric Response in Electronically Correlated Functional Oxides CaCu3Ti4O12, LaFeO3, YFe0.5Cr0.5O3 and their Nanocomposites: A Comparative Study

Author:

Bhattacharya Sudipa1,Yadav Preeti2,Singh Manoj K.2,Vasundhara M.3,Gayen Arup4,Kundu Asish K.5,Seikh Md. Motin1ORCID

Affiliation:

1. Department of Chemistry Visva-Bharati University Santiniketan 731235 India

2. Centre of Material Sciences University of Allahabad Prayagraj 211002

3. Polymers and Functional Materials Department Centre of Material Sciences Department CSIR-Indian Institute of Chemical Technology Tarnaka Hyderabad 500007 India

4. Department of Chemistry Jadavpur University Kolkata 700032 India

5. Discipline of Physics Indian Institute of Information Technology, Design & Manufacturing Jabalpur Dumna Airport Road Madhya Pradesh 482005 India

Abstract

AbstractCaCu3Ti4O12 (CCTO), LaFeO3 (LFO) and YFe0.5Cr0.5O3 (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 CaCu3Ti4O12 exhibits a broad range of particle size starting from a couple of hundreds of nanometer to micrometer, whereas that for LaFeO3 and YFe0.5Cr0.5O3 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.

Publisher

Wiley

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