Colossal dielectric and magnetodielectric effect in Er2O3 nanoparticles embedded in a SiO2 glass matrix

S. Mukherjee, C. H. Chen, C. C. Chou, K. F. Tseng, B. K. Chaudhuri, and H. D. Yang
Phys. Rev. B 82, 104107 – Published 10 September 2010

Abstract

An intriguing colossal enhancement of dielectric constant along with magnetodielectric (MD) behavior is observed in nanoparticle (NP) Er2O3 (0.5mol%) embedded SiO2 glass matrix synthesized via sol-gel route. A broad dielectric peak with a maximum at Tm (270K) exhibits typical diffuse phase transition following modified Curie-Weiss behavior. Conduction mechanism (showing energy barrier Ea1.13eV near Tm) is closely related to the thermally activated oxygen vacancies. At the highest applied magnetic field 9 T, the dielectric constant around Tm is enhanced almost 2.75 (at 2.5 kHz frequency) times compared with that at zero field. The MD effect observed in this glassy composite is considered to be associated with the direct consequence of magnetoresistance changes which depends on the magnetic NP size and separation.

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  • Received 1 March 2010

DOI:https://doi.org/10.1103/PhysRevB.82.104107

©2010 American Physical Society

Authors & Affiliations

S. Mukherjee, C. H. Chen, C. C. Chou, K. F. Tseng, B. K. Chaudhuri*, and H. D. Yang

  • Department of Physics and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan

  • *Permanent address: Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India.
  • Corresponding author; yang@mail.phys.nsysu.edu.tw

Comments & Replies

Comment on “Colossal dielectric and magnetodielectric effect in Er2O3 nanoparticles embedded in a SiO2 glass matrix”

D. Hreniak, L. Marciniak, W. Strek, F. Piccinelli, A. Speghini, and M. Bettinelli
Phys. Rev. B 84, 056102 (2011)

Reply to “Comment on ‘Colossal dielectric and magnetodielectric effect in Er2O3 nanoparticles embedded in a SiO2 glass matrix”’

S. Mukherjee, C. H. Chen, C. C. Chou, K. F. Tseng, B. K. Chaudhuri, and H. D. Yang
Phys. Rev. B 84, 056103 (2011)

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Vol. 82, Iss. 10 — 1 September 2010

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