Origin of giant dielectric constant and conductivity behavior in Zn1-xMgxO (0 ≤ x ≤ 0.1) ceramics

Raj, CJ and Paramesh, G and Prakash, B and Meher, KRSP and Varma, KBR (2016) Origin of giant dielectric constant and conductivity behavior in Zn1-xMgxO (0 ≤ x ≤ 0.1) ceramics. Materials Research Bulletin, 74. pp. 1-8. ISSN 00255408

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Zn1−xMgxO ( ≤ x ≤ 0.1) ceramics were fabricated by conventional solid-state reaction of co-precipitated zinc oxide and magnesium hydroxide nanoparticles. Structural and morphological properties of the fabricated ceramics were studied using X-ray diffraction and scanning electron microscopic analysis. The dielectric measurements of the ceramics were carried out as a function of frequency and temperature respectively. Interestingly, Mg doped ZnO (MZO) samples exhibited colossal dielectric response (∼1 × 104 at 1 kHz) with Debye like relaxation. The detailed dielectric studies and thermal analyses showed that the unusual dielectric response of the samples were originated from the defected grain and grain boundary (GB) conductivity relaxations due to the absorbed atmospheric water vapor (moisture). Impedance spectroscopy was employed to determine the defected grain and GB resistances, capacitances and which supported Maxwell–Wagner type relaxation phenomena.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mrs SK Pratibha
Date Deposited: 20 Aug 2018 11:53
Last Modified: 20 Aug 2018 11:53
URI: http://nal-ir.nal.res.in/id/eprint/12930

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