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Sintering effects on microstructure and dielectric properties of CCTO ceramics

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2012
434.pdf (207.0Kb)
Authors
Marković, Smilja
Lukić, Miodrag J.
Jovalekić, Čedomir
Škapin, Srečo Davor
Suvorov, Danilo
Uskoković, Dragan
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Abstract
A perovskite-type compound, calcium copper titanate (CaCu3Ti4O12, CCTO) attracted ever increasing attention for its practical applications in microelectronics, especially for preparation of capacitors and memory devices. CCTO ceramics are very attractive because of their giant dielectric constant (∼104−105) in the kilohertz region at room temperature, and their good stability over a wide temperature range from 100 to 600 K. Here, CCTO powder was prepared by solid state reaction between CaCO3, CuO and TiO2 at 1000 °C for 12 hours. Synthesized powder was characterized by XRD, FTIR and FESEM techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powder was uniaxially pressed into pallets (Ø 6 mm) and sintered up to 1100 °C, with 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for calculation of activation energy for sintering process, and furthermore, for choosing two step sintering (TSS) conditions. By TSS the samples were heated up to 1050... (1070) °C and after retention for 10 min the cooled down to 1000 (1020) °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FESEM method; the electrical properties were investigated by ac impedance spectroscopy over the ranges 1000 - 25 °C and 40 Hz - 5 MHz. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with giant dielectric permittivity.

Keywords:
calcium copper titanate / CaCu3Ti4O12 / sintering / perovskites
Source:
The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts, 2012, 74-74
Publisher:
  • Belgrade : Materials Research Society of Serbia
Funding / projects:
  • Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them (RS-45004)
[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_dais_437
URI
https://dais.sanu.ac.rs/123456789/437
Collections
  • ИТН САНУ - Општа колекција / ITS SASA - General collection
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - CONF
AU  - Marković, Smilja
AU  - Lukić, Miodrag J.
AU  - Jovalekić, Čedomir
AU  - Škapin, Srečo Davor
AU  - Suvorov, Danilo
AU  - Uskoković, Dragan
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/437
AB  - A perovskite-type compound, calcium copper titanate (CaCu3Ti4O12, CCTO) attracted ever increasing attention for its practical applications in microelectronics, especially for preparation of capacitors and memory devices. CCTO ceramics are very attractive because of their giant dielectric constant (∼104−105) in the kilohertz region at room temperature, and their good stability over a wide temperature range from 100 to 600 K. Here, CCTO powder was prepared by solid state reaction between CaCO3, CuO and TiO2 at 1000 °C for 12 hours. Synthesized powder was characterized by XRD, FTIR and FESEM techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powder was uniaxially pressed into pallets (Ø 6 mm) and sintered up to 1100 °C, with 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for calculation of activation energy for sintering process, and furthermore, for choosing two step sintering (TSS) conditions. By TSS the samples were heated up to 1050 (1070) °C and after retention for 10 min the cooled down to 1000 (1020) °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FESEM method; the electrical properties were investigated by ac impedance spectroscopy over the ranges 1000 - 25 °C and 40 Hz - 5 MHz. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with giant dielectric permittivity.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts
T1  - Sintering effects on microstructure and dielectric properties of CCTO ceramics
SP  - 74
EP  - 74
UR  - https://hdl.handle.net/21.15107/rcub_dais_437
ER  - 
@conference{
author = "Marković, Smilja and Lukić, Miodrag J. and Jovalekić, Čedomir and Škapin, Srečo Davor and Suvorov, Danilo and Uskoković, Dragan",
year = "2012",
abstract = "A perovskite-type compound, calcium copper titanate (CaCu3Ti4O12, CCTO) attracted ever increasing attention for its practical applications in microelectronics, especially for preparation of capacitors and memory devices. CCTO ceramics are very attractive because of their giant dielectric constant (∼104−105) in the kilohertz region at room temperature, and their good stability over a wide temperature range from 100 to 600 K. Here, CCTO powder was prepared by solid state reaction between CaCO3, CuO and TiO2 at 1000 °C for 12 hours. Synthesized powder was characterized by XRD, FTIR and FESEM techniques. The sinterability of CCTO powders was investigated by heating microscopy. Powder was uniaxially pressed into pallets (Ø 6 mm) and sintered up to 1100 °C, with 2, 5, 10 and 20 °/min. The recorded shrinkage curves were used for calculation of activation energy for sintering process, and furthermore, for choosing two step sintering (TSS) conditions. By TSS the samples were heated up to 1050 (1070) °C and after retention for 10 min the cooled down to 1000 (1020) °C and kept for 20 h. The microstructure of CCTO ceramics sintered by conventional and TSS techniques was examined by FESEM method; the electrical properties were investigated by ac impedance spectroscopy over the ranges 1000 - 25 °C and 40 Hz - 5 MHz. Electrical properties of the sintered CCTO ceramics were correlated to the samples microstructure. Finally, we have shown that appropriate choice of sintering conditions is important for preparation of high-quality CCTO ceramics with giant dielectric permittivity.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts",
title = "Sintering effects on microstructure and dielectric properties of CCTO ceramics",
pages = "74-74",
url = "https://hdl.handle.net/21.15107/rcub_dais_437"
}
Marković, S., Lukić, M. J., Jovalekić, Č., Škapin, S. D., Suvorov, D.,& Uskoković, D.. (2012). Sintering effects on microstructure and dielectric properties of CCTO ceramics. in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 74-74.
https://hdl.handle.net/21.15107/rcub_dais_437
Marković S, Lukić MJ, Jovalekić Č, Škapin SD, Suvorov D, Uskoković D. Sintering effects on microstructure and dielectric properties of CCTO ceramics. in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts. 2012;:74-74.
https://hdl.handle.net/21.15107/rcub_dais_437 .
Marković, Smilja, Lukić, Miodrag J., Jovalekić, Čedomir, Škapin, Srečo Davor, Suvorov, Danilo, Uskoković, Dragan, "Sintering effects on microstructure and dielectric properties of CCTO ceramics" in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts (2012):74-74,
https://hdl.handle.net/21.15107/rcub_dais_437 .

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