共查询到18条相似文献,搜索用时 140 毫秒
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用衍射仪和Guinier聚焦照相机收集了铌酸锶钡钠系统一系列化合物的X射线粉末衍射图谱(CuKα辐射)。给出了Ba2NaNb5O15,SrBaNaNb5O15和Sr2.05Na0.90Nb5O15详细指标化了的粉末衍射数据,可代替原有的JCPDSX射线粉末衍射标准数据卡(卡片号为23-654,27-1408,27-1409和27-787)的数据。
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铁电SBN薄膜电光系数的测量及其在波导中的应用 总被引:2,自引:0,他引:2
利用溶胶-凝胶法在MgO(001)衬底上获得C轴择优取向的铁电铌酸锶钡(SBN)薄膜,主要介绍MgO(001)衬底上SBN60薄膜及掺入的K离子与Nb离子摩尔比例为1:3的SBN60薄膜横向电光系数r51的测量,实验测得不掺K的SBN60薄膜r51值为37.6pm/V,掺K的r51值为58.5pm/V。并由此设计一种基于MgO(001)衬底上的马赫一曾德尔型SBN60薄膜波导调制器,计算出在633nm时,掺K比例为1:3的此种波导调制器半波调制电压值为10V,不掺K的半波电压值为16V,结果说明掺入K离子能增加薄膜的横向电光系数并有效的减少波导的半波调制电压。 相似文献
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用干涉仪的方法测量了Ce:BaTiO3晶体的低频电光系数和压电系数.排除压电效应对光通过晶体引起相位的变化,得到低频下经极化的Ce:BaTiO3单晶的电光系数r42=1945±220pm/V和r13=11.8±1pm/V.从而,为研究Ce:BaTiO3晶体的光折变效应和理论计算提供了精确的线性电光系数
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本文讨论了由作者首次人工合成的新的钨青铜结构铁电单晶(K0.20Na0.20Sr0.60Ba0.20)Nb2O6全部电弹常数的测量方法和测量程序。第一次发表了该晶体的全部电弹常数及电-机耦合系数等共53个数据。绝大多数的数据是按IRE标准进行测量的。采用了(zxl)45°切片的厚度切变振动模式和(xzt)45°棒的长度扩张模式来测定弹性系数s66D和s13D。对实验过程引起的测量误差进行了讨论。
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X.T. Li P.Y. Du H. Ye C.L. Mak K.H. Wong 《Applied Physics A: Materials Science & Processing》2008,92(2):397-400
Textured LixNi2-xO (LNO) thin films have been fabricated on (001)MgO substrates by pulsed laser deposition technique. The as-deposited LNO
films shows a conductivity of 2.5×10-3 Ω m and possess a transmittance of about 35% in the visible region. Subsequent deposition of Sr0.6Ba0.4Nb2O6 (SBN60) thin film on these LNO-coated MgO substrates resulted in a textured SBN layer with a 〈001〉 orientation perpendicular
to the substrate plane. Phi scans on the (221) plane of the SBN layer indicated that the films have two in-plane orientations
with respect to the substrate. The SBN unit cells were rotated in the plane of the film by ± 8.2° as well as ± 45° with respect
to the LNO/MgO substrate. Besides the highly (00l)-orientation, the SBN films also exhibited a dense microstructure as shown
by scanning electron microscopy. The electro-optic coefficient (r33) of the SBN film was measured to be 186 pm/V. On the basis of our results, we have demonstrated that the LNO film can be
used as a buffer layer as well as a transparent bottom electrode for waveguide applications. The SBN/LNO heterostructure is
also a suitable candidate for integrated electro-optics devices.
PACS 42.79.Gn; 42.82.Et; 78.20.Ci 相似文献
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固相法合成系列名义组成为Bi2-xNbxSr2Ca2Cu3Oy(x=0—1.0)的样品,电学和磁学测量表明,当掺入x=0.2—0.3的Nb有明显加强2223相生成的作用,配比为Bi1.7Nb0.3Sr2Ca2Cu3Oy时最佳;当掺Ba以部分取代Sr后有明显协同Nb促进2223相生成的作用,比单掺Nb效果更为显著,其中以Bi1.7Nb0.3Sr1.8Ba0.2Ca2Cu3Oy为最优组成。热重分析(TGA)实验显示,掺Nb(Ba)后样品在~600°C出现吸氧增重;XPS中的O1s峰显示掺Nb(Ba)后除~531eV的主峰外,在~529eV的肩峰更加明显;讨论了Nb(Ba)对晶体结构的可能影响。
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N. D. Scarisoreanu G. Dinescu R. Birjega M. Dinescu D. Pantelica G. Velisa N. Scintee A. C. Galca 《Applied Physics A: Materials Science & Processing》2008,93(3):795-800
SBN thin films were grown on MgO and Silicon substrates by PLD and RF-PLD (radiofrequency assisted PLD) starting from single
crystal Sr0.6Ba0.4Nb2O6 and ceramic Sr0.5Ba0.5Nb2O6 stoichiometric targets. Morphological and structural analyses were performed on the SBN layers by AFM and XRD and optical
properties were measured by spectroellipsometry. The films composition was determined by Rutherford Backscattering Spectrometry.
The best set of experimental conditions for obtaining crystalline, c-axis preferential texture and with dominant 31° in-plane orientation relative to the MgO (100) axis is identified. 相似文献
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V. M. Mukhortov Yu. I. Golovko A. V. Pavlenko D. V. Stryukov S. V. Biryukov A. P. Kovtun S. P. Zinchenko 《Physics of the Solid State》2018,60(9):1786-1792
The ability to grow the interfacial defect-poor Sr0.5Ba0.5Nb2O6 + Ba0.2Sr0.8TiO3 and Ba0.8Sr0.2TiO3 + Ba0.4Sr0.6TiO3 ferroelectric films onto the doped silicon substrates is discussed. A study of piezo-response via the quasi-static method (using the electrode area of 0.07 mm2) reveals that heterostructures possess an initial polarized ferroelectric state with a spontaneous polarization vector perpendicular to the substrate at any type of Si conductivity. The polarized state is established to refer to two-dimension stresses in the ferroelectric, which is tunable through a preprepared BaxSr1 – xTiO3 onto a sublayer substrate as well as to a thickness of this sublayer. Polarization switching in Sr0.5Ba0.5Nb2O6/Si and Ba0.8Sr0.2TiO3/Si heterostructures under the external field arises at only using the barium–strontium titanate sublayer predeposited onto silicon. A 15% decrease in switching polarization in Ba0.8Sr0.2TiO3/Ba0.4Sr0.6TiO3/Si structures is observed after 500 h. 相似文献
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Yiping Guo Ken-ichi Kakimoto Hitoshi Ohsato 《Journal of Physics and Chemistry of Solids》2004,65(11):1831-1835
We report that ferroelectric-relaxor behavior is induced by doping of SrO and TiO2, or BaO and TiO2 into classic ferroelectric (Na0.5K0.5)NbO3. It is found that [(Na0.5K0.5)0.9Sr0.1](Nb0.9Ti0.1)O3 ceramics exhibit a pronounced ferroelectric-relaxor behavior, comparable to that of [(Na0.5K0.5)0.9Ba0.1](Nb0.9Ti0.1)O3 ceramics. Our results indicate that the relaxor behavior is closely related to the appearance of micropolar regions in these systems. The relaxor behavior should arise from the dynamic response of micropolar clusters. Raman spectra of [(Na0.5K0.5)1−xSrx](Nb1−xTix)O3 ceramics measured in the wavenumber range from 100 to 1200 cm−1 confirm that the first order scattering is dominant in phonon bands should result from both short-range ordered region (micropolar regions) and disordered matrix. The frequency dependence of dielectric permittivity measurements show that the relaxor behavior of SrO and TiO2, or BaO and TiO2 doped (Na0.5K0.5)NbO3 ceramics is not a Debye type in the radio frequency range. 相似文献
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Divalent europium-doped alkaline earth metal silicate phosphors, (Ba1?x?ySryEux)9Sc2Si6O24 (x=0.005–0.1, y=0–0.95), have been successfully prepared by solid-state reaction at 1350 °C. The analysis of X-ray diffraction shows that the compounds are in a single phase at the proper concentration of Sr2+. At room temperature, the Eu2+-activated Ba9Sc2Si6O24 phosphor exhibits a single emission band peaking at about 506 nm. With the increasing content of Sr2+, the luminescent intensity of (Ba1?x?ySryEux)9Sc2Si6O24 weakens, and the emission peak shifts towards red. Luminescence concentration quenching occurs when Eu2+ content x is more than 1 mol% in (Ba1?x?ySryEux)9Sc2Si6O24 (y=0/0.2). At low temperatures (Ba0.9?ySryEu0.1)9Sc2Si6O24 (y=0/0.2) phosphors have two emission bands corresponding to different Eu2+ crystallographic sites. The high energy peak (P1) is quenched at room temperature, while the low energy peak (P2) weakens much more slowly owing to the energy transfer from P1 to P2. 相似文献
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K. Buse 《Applied physics. B, Lasers and optics》1997,64(4):391-407
3 , LiTaO3, BaTiO3, Ba1-xSrxTiO3 (, BST), Ba1-xCaxTiO3 (, BCT), KNbO3, KTa1-xNbxO3 (, KTN), Sr1-xBaxNb2O6 (, SBN) and Bi12(Si,Ti,Ge)O20 (BSO, BTO, BGO) are discussed. Utilizing the knowledge on the charge transport processes, consequences for applications are
deduced; improved techniques for nondestructive readout of holograms with light of the recording wavelength are described.
Received: 14. October 1996 相似文献