High Schottky barrier at grain boundaries observed in Na1/2Sm1/2Cu3Ti4O12 ceramics

被引：30
作者：
Somphan, Weeraya [1 ]
Thongbai, Prasit [2 ,3 ]
Yamwong, Teerapon [4 ]
Maensiri, Santi [5 ]
机构：
[1] Khon Kaen Univ, Mat Sci & Nanotechnol Program, Fac Sci, Khon Kaen 40002, Thailand
[2] Khon Kaen Univ, Dept Phys, Fac Sci, Khon Kaen 40002, Thailand
[3] Khon Kaen Univ, Integrated Nanotechnol Res Ctr INRC, Khon Kaen 40002, Thailand
[4] Natl Met & Mat Technol Ctr MTEC, Pathum Thani 12120, Thailand
[5] Suranaree Univ, Sch Phys, Inst Sci, Nakhon Ratchasima 30000, Thailand
来源：
MATERIALS RESEARCH BULLETIN | 2013年 / 48卷 / 10期
关键词：
Ceramics; Impedance spectroscopy; Photoelectron spectroscopy; Dielectric properties; Electrical properties; GIANT DIELECTRIC-CONSTANT; CACU3TI4O12; CERAMICS; ELECTRICAL-PROPERTIES; POTENTIAL BARRIER; ACU(3)TI(4)O(12); PERMITTIVITY;
D O I：
10.1016/j.materresbull.2013.06.028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dielectric properties and nonlinear current-voltage characteristics of Na1/2Sm1/2Cu3Ti4O12 ceramics prepared by a conventional solid state reaction method were investigated. Na1/2Sm1/2Cu3Ti4O12 ceramics exhibited a high dielectric permittivity of 7.0-8.4 x 10(3) and low loss tangent (tan delta similar to 0.030-0.041). Non-Ohmic properties with a high breakdown voltage of similar to 2208 V cm(-1) and large nonlinear coefficient of 15.6 were observed in Na1/2Sm1/2Cu3Ti4O12 ceramics. Using complex impedance analysis, Na1/2Sm1/2Cu3Ti4O12 ceramics were shown to be electrically heterogeneous consisting of semiconducting grains and insulating grain boundaries. Giant dielectric properties were described based on the electrically heterogeneous microstructure. X-ray photoelectron spectroscopy analysis suggested that the semiconductive nature of grains may be related to the presence of Cu+ and Ti3+. The formation of an electrostatic potential barrier at the grain boundaries of Na1/2Sm1/2Cu3Ti4O12 ceramics was suggested to be caused by the Schottky effect. Interestingly, high electrostatic potential barriers at grain boundaries in Na1/2Sm1/2Cu3Ti4O12 ceramics were calculated and found to be 0.925-0.964 eV. (c) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4087 / 4092
页数：6
相关论文
共 37 条
  • [21] Giant dielectric and low voltage varistor behaviors of Ba-doped Bi1/2Na1/2Cu3Ti4O12 ceramics
    Qiu, Y.
    Ma, Z. Z.
    Huo, S. X.
    Duan, H. N.
    Tian, Z. M.
    Yuan, S. L.
    Chen, L.
    [J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2012, 23 (08) : 1587 - 1591
  • [22] Non-Ohmic and dielectric properties of a Ca2Cu2Ti4O12 polycrystalline system
    Ramirez, M. A.
    Bueno, P. R.
    Varela, J. A.
    Longo, E.
    [J]. APPLIED PHYSICS LETTERS, 2006, 89 (21)
  • [23] Processing, dielectric properties and impedance characteristics of Na0.5Bi0.5Cu3Ti4O12 ceramics
    Ren, Hongmei
    Liang, Pengfei
    Yang, Zupei
    [J]. MATERIALS RESEARCH BULLETIN, 2010, 45 (11) : 1608 - 1613
  • [24] Colossal dielectric constants: A common phenomenon in CaCu3Ti4O12 related materials
    Sebald, J.
    Krohns, S.
    Lunkenheimer, P.
    Ebbinghaus, S. G.
    Riegg, S.
    Reller, A.
    Loidl, A.
    [J]. SOLID STATE COMMUNICATIONS, 2010, 150 (17-18) : 857 - 860
  • [25] Giant dielectric and electrical properties of sodium yttrium copper titanate: Na1/2Y1/2Cu3Ti4O12
    Somphan, Weeraya
    Sangwong, Nuchjarin
    Yamwong, Teerapon
    Thongbai, Prasit
    [J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2012, 23 (06) : 1229 - 1234
  • [26] High dielectric constant in ACu3Ti4O12 and ACu3Ti3FeO12 phases
    Subramanian, MA
    Li, D
    Duan, N
    Reisner, BA
    Sleight, AW
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 2000, 151 (02) : 323 - 325
  • [27] ACu3Ti4O12 and ACu3Ru4O12 perovskites:: high dielectric constants and valence degeneracy
    Subramanian, MA
    Sleight, AW
    [J]. SOLID STATE SCIENCES, 2002, 4 (03) : 347 - 351
  • [28] Effects of Ta5+ doping on microstructure evolution, dielectric properties and electrical response in CaCu3Ti4O12 ceramics
    Thongbai, Prasit
    Jumpatam, Jutapol
    Yamwong, Teerapon
    Maensiri, Santi
    [J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2012, 32 (10) : 2423 - 2430
  • [29] Current-voltage nonlinear and dielectric properties of CaCu3Ti4O12 ceramics prepared by a simple thermal decomposition method
    Thongbai, Prasit
    Putasaeng, Bundit
    Yamwong, Teerapon
    Maensiri, Santi
    [J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2012, 23 (03) : 795 - 801
  • [30] Dielectric properties and electrical response of grain boundary of Na1/2La1/2Cu3Ti4O12 ceramics
    Thongbai, Prasit
    Yamwong, Teerapon
    Maensiri, Santi
    [J]. MATERIALS RESEARCH BULLETIN, 2012, 47 (02) : 432 - 437
1234