High dielectric constant and low optical band gap studies of La-modified Ba(Fe0.5Nb0.5)O3 ceramics

被引：35
作者：
Kar, Subrat Kumar [1 ]
Swain, Sridevi [1 ]
Sonia [1 ]
Kumar, Pawan [1 ]
机构：
[1] Natl Inst Technol, Dept Phys, Rourkela 769008, India
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2015年 / 155卷
关键词：
Ceramics; Sintering; X-ray scattering; Dielectric properties; ELECTRICAL-PROPERTIES; LANTHANUM; COMPENSATION; PERMITTIVITY; ABSORPTION; MECHANISMS; CONDUCTION; SYSTEMS; LA2O3; TIO2;
D O I：
10.1016/j.matchemphys.2015.02.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ba1-xLa2x/3(FeNb)(0.5)O-3/BLFN (x = 0, 0.02, 0.04, 0.06, 0.08) ceramics in single perovskite phase were synthesized by solid state reaction route. Dielectric constant (epsilon(r)) increased with the increase of La content in the BLFN ceramic samples. Defects and the charge compensation mechanisms were used to account the observed high er and the relaxor like behavior of the BLFN ceramic samples. All the BLFN ceramic samples exhibited the wider absorption bands (200-900 nm) and the narrow optical band gaps (similar to 1.3 eV). Dielectric relaxation and the narrow band gaps suggested the formation of oxygen vacancies in the BLFN ceramic samples. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：171 / 177
页数：7
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共 45 条
  • [1] Sintering and Microwave Properties of Zirconium Tin Titanate Doped with Select Oxides
    Arantes, Vera Lucia
    [J]. JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2012, 21 (08) : 1777 - 1784
  • [2] Challenges of Ta2O5 as high-k dielectric for nanoscale DRAMs
    Atanassova, E.
    Paskaleva, A.
    [J]. MICROELECTRONICS RELIABILITY, 2007, 47 (06) : 913 - 923
  • [3] Structure and electronic properties of solid acids based on tungsten oxide nanostructures
    Barton, DG
    Shtein, M
    Wilson, RD
    Soled, SL
    Iglesia, E
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (04): : 630 - 640
  • [4] SPACE-CHARGE RELAXATION IN PEROVSKITES
    BIDAULT, O
    GOUX, P
    KCHIKECH, M
    BELKAOUMI, M
    MAGLIONE, M
    [J]. PHYSICAL REVIEW B, 1994, 49 (12): : 7868 - 7873
  • [5] Producing the lead-free BaFe0.5Nb0.5O3 ceramics with multiferroic properties
    Bochenek, D.
    Surowiak, Z.
    Poltierova-Vejpravova, J.
    [J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 487 (1-2) : 572 - 576
  • [6] Extended photocurrent spectrum of a low band gap polymer in a bulk heterojunction solar cell
    Campos, LM
    Tontcheva, A
    Günes, S
    Sonmez, G
    Neugebauer, H
    Sariciftci, NS
    Wudl, F
    [J]. CHEMISTRY OF MATERIALS, 2005, 17 (16) : 4031 - 4033
  • [7] Preparation, structure and ferroelectric properties of Ba(Fe0.5Nb0.5)O3 powders by sol-gel method
    Chung, CY
    Chang, YH
    Chen, GJ
    Chai, YL
    [J]. JOURNAL OF CRYSTAL GROWTH, 2005, 284 (1-2) : 100 - 107
  • [8] Effects of lanthanum doping on the dielectric properties of Ba(Fe0.5Nb0.5)O3 ceramic
    Chung, CY
    Chang, YH
    Chen, GJ
    [J]. JOURNAL OF APPLIED PHYSICS, 2004, 96 (11) : 6624 - 6628
  • [9] CONDUCTION IN NON-CRYSTALLINE SYSTEMS .5. CONDUCTIVITY, OPTICAL ABSORPTION AND PHOTOCONDUCTIVITY IN AMORPHOUS SEMICONDUCTORS
    DAVIS, EA
    MOTT, NF
    [J]. PHILOSOPHICAL MAGAZINE, 1970, 22 (179): : 903 - &
  • [10] SELF-COMPENSATION IN LANTHANUM-DOPED STRONTIUM-TITANATE
    EROR, NG
    BALACHANDRAN, U
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 1981, 40 (01) : 85 - 91
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