SOL-GEL COMBUSTION SYNTHESIS OF GIANT DIELECTRIC CaCu3Ti4O12 NANO POWDER
Keywords:
Sol-gel combustion, Giant Dielectric Constant, Nano Powder, CaCu3Ti4O12Abstract
Nano-sized powders of Calcium Copper Titanate (CaCu3Ti4O12) were synthesized by a sol-gel combustion method without using any external fuels. The powder was calcined at 500, 650 and 800 °C in air for 3 hr. The CaCu3Ti4O12 powders were characterized by TG-DTA, XRD, FTIR and AFM. The XRD results for the powders calcined at 650°C ,800°C and sintered at 950°C indicated the formation and confirmation of [(CaCu3)Ti4O12] CCTO phase. AFM studies showed that average particle size of the CCTO powder ranges from 60 to 80nm. HR-SEM micrographs of the sintered CaCu3Ti4O12 ceramics showed the grain size ranges from 1 to 2.8 µm. Dielectric constant (e) about 9919 at room temperature for 10 kHz. It reaches as high as 1, 06,175 at 500 °C. The present material shows the dielectric relaxation at 300 °C. CCTO Nano powder prepared by the sol-gel combustion process with ideal electric properties is expected to find applications in microelectronic devices
Downloads
Metrics
References
Deschanvres A, Raveau B and F Tollemer (1967), “Substitution of Copper for a Divalent Metal in Perovskite-type Titanates”, Bull. Soc. Chim. Fr. 4077–4078.
Subramanian M A, Li D, Duran N, Reisner B A and Sleight A W (2000), “High Dielectric Constant in ACu3Ti3FeO12 and ACu3Ti3FeO12 Phases”, Journal of Solid State Chemistry, Vol. 151(2), 323–325.
Ramirez A P, Subramanian M A, Gardel M, Blumberg G, Li D, Vogt T and Shapiro S M (2000), “Giant Dielectric Constant Response in a Copper-Titanate”, Solid State Communications, Vol. 115(5), 217–220.
Homes C C, Vogt T, Shapiro S M, Wakimoto S and Ramirez A P (2001), “Optical Response of High-dielectric-constant Perovskite-related Oxide”, Science, Vol. 293(5530), 673–676.
Thomas P, Dwarakanath K, Varma K B R and Kutty T R N (2009), “Synthesis of Nanoparticles of the Giant Dielectric Material, CaCu3Ti4O12 from a Precursor Route”, Journal of Thermal Analysis and Calorimetry, Vol. 95 (1), 267–272.
Duk Keun Yoo and Sang Im Yoo, (2007), “Microstructure and Dielectric Properties of CaCu3Ti4O12 Ceramic”, Materials Letters 61, 1835-1838.
Shao S F, Zhang J L, Zheng P and Wang C L (2007), “Effect of Cu-stoichiometry on the Dielectric and Electric Properties in CaCu3Ti4O12 Ceramics”, Solid State Communications, Vol. 142(5), 281–286.
Seunghwa Kwon, Chien-Chih Huang, Subramanian M A and David P Cann, (2009), “Effects of Cation Stoichiometry on the Dielectric Properties of CaCu3Ti4O12”, Journal of Alloys and Compounds, Vol. 473,(1-2), 433-436.
Chih-Ming Wang,, Kuo-Sheng Kao, Shih-Yuan Lin, Ying-Chung Chen and Shang-Chih Weng (2008), “Processing and Properties of CaCu3Ti4O12 Ceramics”, Journal of Physics and Chemistry of Solids, Vol. 69(2-3), 608–610.
Jha P, Arora P and Ganguli A K (2003), “Polymeric Citrate Precursor Route to the Synthesis of the High Dielectric Constant Oxide CaCu3Ti4O12”, Materials Letters, Vol. 57(16-17), 2443-2446.
Laijun Liu, Huiqing Fan, Pinyang Fang and Xiuli Chen (2008), “Sol–gel Derived CaCu3Ti4O12 Ceramics: Synthesis, Characterization and Electrical Properties”, Materials Research Bulletin, Vol. 43(7), 1800–1807.
Kashinath C Patil, Aruna S T and Tanu Mimani (2002), “Combustion Synthesis: An Update”, Current Opinion in Solid State and Materials Science, Vol. 6, 507–512.
Patil K C, Aruna S T In: Borisov A A, De Luca L T, Merzhanov A G, Scheck Y N, Editors (2002) “Redox Methods in SHS Practice in Self-propagating High Temperature Synthesis of Materials”, New York, Taylor & Francis.
Chivalrat Masingboon , Prasit Thongbai , Santi Maensiri ,Teerapon Yamwong and Supapan Seraphin (2008), “Synthesis and Giant Dielectric Behavior of CaCu3Ti4O12 Ceramics Prepared by Polymerized Complex Method”, Materials Chemistry and Physics, Vol. 109(2-3) , 262–270.
Almeida A F L, De Oliveira R S, Goes J C, Sasaki J M, Souza A G, Mendes Filho J and Sombra A S B (2002), “Structural Properties of CaCu3Ti4O12 Obtained by Mechanical Alloying”, Materials Science & Engineering B. Solid State Materials for Advanced Technology, Vol. 96(3), 275-283.
Liu J J, Sui Y, Duan C, Mei W N, Smith R W and Hardy J R (2006), “Low-Temperature Synthesis by Pyrolysis of an Organic Solution”, Chemistry of Materials, Vol. 18(16), 3878-3882.
Hassini A, Gervais M, Coulon J, Phouc V T and Gervais F (2001), “Synthesis of Ca0.25Cu0.75TiO3 and Infrared Characterization of Role Played by Copper”, Materials Science & Engineering B. Solid State Materials for Advanced Technology, Vol. 87(2), 164–168.
Adams T B, Sinclair D C and West A R (2002), “Giant Barrier Layer Capacitance Effects in CaCu3Ti4O12 Ceramics”, Advanced Materials, Vol. 14(18), 1321–1323.
Jin S, Xia H, Zhang Y, Guo J, and Xu J (2007), “Synthesis of CaCu3Ti4O12 Ceramic via a Sol–gel Method”, Materials Letters, Vol. 61(6), 1404–1407.
Liu L, Fan H, Fang P and Jin L (2007), “Electrical heterogeneity in CaCu3Ti4O12 Ceramics Fabricated by Sol–gel Method”, Solid State Communications, Vol. 142(10), 573–576.
Ben Peng Zhu, Zi Yu Wang, Yue Zhang, Zhi Song Yu, Jing Shi and Rui Xiong (2009), “Low Temperature Fabrication of the Giant Dielectric Material CaCu3Ti4O12 by Oxalate Co-precipitation Method”, Materials Chemistry and Physics, Vol. 113(2-3), 746–748.
