Influence of Erbium doping on the electrical behaviour of CaCu3Ti4O12 ceramics probed by impedance spectroscopy analysis

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.05.035· OSTI ID:22805224

Sakthisabarimoorthi, A.; Martin Britto Dhas, S. A. ^[1]; Robert, R. ^[2]

---

1. Department of Physics, Sacred Heart College (Autonomous), Tirupattur, Tamilnadu (India)
2. Department of Physics, Government Arts College for Men, Krishnagiri, Tamilnadu (India)

Highlights: • Influence of Er doping on the electrical behaviour of CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics was reported. • Powder XRD analysis reveals that addition of Er did not affect the crystallinity. • High dielectric constant (ε{sub r} = 26,749) was found for Er doped CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics. • Nyquist plot suggest the negative temperature coefficient of resistance behaviour. - Abstract: Herein, the preparation and impedance spectroscopic investigation of pure and Er doped CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics is reported. FTIR spectroscopy and powder XRD analysis elucidate the surface functionality and crystalline nature of the products respectively. Scanning Electron Microscopy images substantiate the homogenous formation of nanoparticles and the EDS analysis confirms the elemental composition of the products. A relatively high dielectric constant (ε{sub r} = 26,749) is found for Er doped CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics than that of pure CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics (ε{sub r} = 5885) at 10 Hz (at 800 K). Nyquist plot of pure and Er doped CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics indicates the presence of a non-Debye type of relaxation phenomenon, which is further validated from the electrical modulus analysis. The variation of temperature dependent relaxation time of pure and Er doped CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics is estimated from both the imaginary part of impedance and electrical modulus analysis.

• OSTI ID: 22805224
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 106; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CERAMICS
DIELECTRIC MATERIALS
DOPED MATERIALS
ERBIUM
FOURIER TRANSFORM SPECTROMETERS
NANOPARTICLES
POWDERS
RELAXATION TIME
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
TEMPERATURE COEFFICIENT
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION