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Enhanced dielectric responses in Mg-doped CaCu 3 Ti 4 O 12

Enhanced dielectric responses in Mg-doped CaCu 3 Ti 4 O 12 We report the effects of the Mg doping on the dielectric properties of CaCu 3 Ti 4 O 12 CaCu 3 Ti 4 O 12 in the frequency range of 200 Hz–200 kHz and in the temperature range of 58–473 K. It is found that the incorporations of Mg 2+ Mg 2 + result in increases in the dielectric constant by 12%–20% and decreases in the dielectric loss by 41%–64% (with the minimum of 0.042 for CaCu 2.7 Mg 0.3 Ti 4 O 12 CaCu 2.7 Mg 0.3 Ti 4 O 12 ) at room temperature and at 1 kHz. The x-ray photoemission spectroscopy measurements reveal that the content of Cu 3+ Cu 3 + increases with the increasing concentration of Mg 2+ Mg 2 + . The enhanced dielectric response may be related to the influence of Cu 3+ Cu 3 + and/or Mg 2+ Mg 2 + . In other words, Mg 2+ Mg 2 + is an effective ion to optimize the dielectric properties of CaCu 3 Ti 4 O 12 CaCu 3 Ti 4 O 12 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physics American Institute of Physics
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