NDLI: Improved giant dielectric properties of CaCu3Ti4O12via simultaneously tuning the electrical properties of grains and grain boundaries by F− substitution

Content Provider	Royal Society of Chemistry (RSC)
Author	Jumpatam, Jutapol Putasaeng, Bundit Maensiri, Santi Chindaprasirt, Prinya Thongbai, Prasit Chanlek, Narong Kidkhunthod, Pinit
Copyright Year	2017
Abstract	A novel concept to simultaneously modify the electric responses of the grain and grain boundaries of CaCu3Ti4O12 ceramics was proposed, involving doping with F− anions to improve the giant dielectric properties. The grain growth rate of CaCu3Ti4O12 ceramics was enhanced by doping with F− anions, which were found to be homogeneously dispersed in the microstructure. Substitution of F− anions can cause an increase in the resistance of the insulating grain boundary and a decrease in the grain resistance. The former originated from the ability of the F− dopant to enhance the Schottky barrier height at the grain boundaries, leading to a great decrease in the dielectric loss tangent by a factor of 5 (tan δ < 0.1). The latter was primarily attributed to the increase in Ti3+ and Cu+ concentrations due to charge compensation, resulting in a significantly enhanced intensity of space charge polarization at the grain boundaries. This is the primary cause of the increase in dielectric permittivity from ≈104 to ≈105. The giant dielectric and electrical properties were well described by the Maxwell–Wagner polarization relaxation based on the internal barrier layer capacitor model of Schottky barriers at the grain boundaries.
Starting Page	4092
Ending Page	4101
Page Count	10
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	7
Issue Number	7
Journal	RSC Advances
DOI	10.1039/c6ra27381e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dielectric loss Walter H. Schottky Wagner Grain growth Dopant Space charge Maxwell Dielectric Permittivity Capacitor Grain boundary Schottky barrier
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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