Preferences help
enabled [disable] Abstract
Number of results
2012 | 121 | 1 | 205-207
Article title

Internal Barrier Layer Capacitance Effects in Neodymium Copper Tantalate Ceramics

Title variants
Languages of publication
A new perovskite material Nd_{2/3}CuTa_4O_{12} was applied as a naturally formed internal barrier layer capacitor. The powder prepared by solid state synthesis and ball milling was pressed into pellets and sintered at 1180-1220°C. Dielectric properties of ceramic samples were characterized by impedance spectroscopic studies carried out in the temperature range from - 55 to 700C at frequencies 10 Hz ÷ 2 MHz. Two types of the dielectric response were revealed - a high frequency response attributed to grains which occurred at low temperatures, and a low frequency one related to grain boundaries which dominated at higher temperatures. Resistances and capacitances of grains were found to be two orders lower than those of grain boundaries. Two plateaus were observed in the dielectric permittivity versus frequency plots - a low frequency step corresponding to a high value of 10^4 and a high frequency step at a level of 40. Scanning electron microscopy observations and energy dispersive spectroscopy analysis confirmed that Nd_{2/3}CuTa_4O_{12} ceramics were composed of semiconducting grains and insulating oxygen-enriched grain boundaries. The formation of such an electrically heterogeneous system during the one step fabrication process in air leads to spontaneous internal barrier layer capacitance effects responsible for a high and relatively stable dielectric permittivity of the developed material.
Physical description
  • 1. M.A. Subramanian, D. Li, N. Duan, B.A. Reisner, A.W. Sleight, J. Solid State Chem. 151, 323 (2000)
  • 2. D.C. Sinclair, T.B. Adams, F.D. Morrison, A.R. West, Appl. Phys. Lett. 80, 2153 (2002)
  • 3. B. Shri Prakash, K.B.R. Varma, J. Mater. Sci., Mater. Electron. 17, 899 (2006)
  • 4. M. Li, Z. Shen, M. Nygren, A. Feteira, D.C. Sinclair, A.R. West, J. Appl. Phys. 106, 104106 (2009)
  • 5. J. Liu, C.G. Duan, W.G. Yin, W.N. Mei, R.W. Smith, J.R. Hardy, Phys. Rev. B 70, 144106 (2004)
  • 6. W. Hao, J. Hang, Y. Tan, W. Su, J. Am. Ceram. Soc. 92, 2937 (2009)
  • 7. B. Renner, P. Lunkenheimer, M. Schetter, A. Loidl, A. Reller, S.G. Ebbinghaus, J. Appl. Phys. 96, 4400 (2004)
  • 8. S.G. Ebbinghaus, Prog. Solid State Chem. 35, 421 (2007)
  • 9. D. Szwagierczak, J. Kulawik, J. Eur. Ceram. Soc. 28, 2075 (2008)
  • 10. D. Szwagierczak, J. Kulawik, J. Alloys Comp. 491, 465 (2010)
Document Type
Publication order reference
YADDA identifier
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.