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题名: The effect of Li-substitution on the M-phases of AgNbO3
作者: Khan, H. U.1;  Sterianou, I.1;  Miao, S.1, 2;  Pokorny, J.1, 3;  Reaney, I. M.1
刊名: JOURNAL OF APPLIED PHYSICS
发表日期: 2012-01-15
DOI: 10.1063/1.3677871
卷: 111, 期:2
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Applied
研究领域[WOS]: Physics
英文摘要: Ceramics in the solid solution, LixAg1-xNbO3 (LAN) with 0 <= x <= 0.20, have been synthesized by the mixed oxide method. X-ray diffraction (XRD) revealed that only compositions with x <= 0.05 were single phase which were indexed according to Pbcm symmetry with a unit cell, root 2a(p) x root 2a(p) x 4a(p) (where a(p) is the fundamental perovskite lattice parameter). For compositions with x >= 0.1, second phase peaks attributed to LiNbO3 were observed and the matrix phase transformed to a metrically rhombohedral structure according to XRD. A phase transition at 0.05 < x <= 0.1 was confirmed by Raman spectroscopy and electron diffraction but the latter technique revealed superstructure reflections for x >= 0.1 at +/- 1/6{00l} and 1/2{ooo} +/- 1/6{00l} (where o = odd). These support the premise that Li doping invokes a new complex modulated tilt system with a root 2a(p) x root 2a(p) x 6a(p) unit cell rather than root 2a(p) x root 2a(p) x 4a(p) (Pbcm). Reflections of the type +/- 1/6{00l} are, however, streaked along the inverted right perpendicular001inverted left perpendicular direction indicating that the structure may be incommensurate or only partially ordered. The appearance of the root 2a(p) x root 2a(p) x 6a(p) structure is associated with strong asymmetry in the peak in permittivity attributed to the M-3-M-2 and a decrease in intensity of the peak in permittivity associated with the M-2-M-1 transition. Slim polarization versus field curves characteristic of weak ferroelectricity were observed for compositions with x <= 0.05 but for higher values of x the loops were unsaturated albeit with larger remanent polarization. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3677871]
关键词[WOS]: AGNB1-XTAXO3 SOLID-SOLUTIONS ;  NIOBATE SINGLE-CRYSTALS ;  DIELECTRIC-PROPERTIES ;  SILVER NIOBATE ;  PIEZOELECTRIC PROPERTIES ;  FERROELECTRIC PHASE ;  RAMAN-SCATTERING ;  LITHIUM-NIOBATE ;  TRANSITIONS ;  CERAMICS
语种: 英语
WOS记录号: WOS:000299792400065
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142956
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
3.Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic

Recommended Citation:
Khan, H. U.,Sterianou, I.,Miao, S.,et al. The effect of Li-substitution on the M-phases of AgNbO3[J]. JOURNAL OF APPLIED PHYSICS,2012,111(2).
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