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Super-stable permittivity and low dielectric loss of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)ceramics within an ultra-wide temperature range

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Journal of Materiomics 2023年第3期9卷 482-491页

作者： Pengrong Ren Han zhao Xin Wang Yuhui Wan Zhiyong Liu Changbai Long Fuxue Yan Till Frӧmling gaoyang zhao Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and EngineeringXi'an University of TechnologyXi'an710048China Laboratory of Thin Film Techniques and Optical Test School of Photoelectrical EngineeringXi'an Technological UniversityXi'an710032China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang330063China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an710049China Institute of Materials Science Technische Universit€at DarmstadtFB Nichtmetallisch-Anorganische WerkstoffeAlarich-Weiss-Straße 2D-64287DarmstadtGermany

This work designs a new system(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)with a nonstoichiometric bismuth ratio,which is used as dielectrics of ceramics capacitors.Phase structure evolution of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)is characterized using XRD,Raman and TEM.Dielectric and resistant properties of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)are investigated with increasing concentration of NaTaO_(3).With these in-vestigations,the structure and defect chemistry of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)are rationalized and their respective impact on capacitor properties are elucidated.The optimized composition 0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)possesses an ultra-wide operating temperature range(-92e398C),in which both stable permittivity and low dielectric loss is obtained.Furthermore,the fabrication of multilayer ceramics capacitors(MLCC)based on 0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)dielectrics is investigated.With the addition of sintering aids,0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)could be co-fired with Ag at 910℃in air,and the low temperature co-fired ceramic(LTCC)capacitors maintain good temperature stability of permittivity and low dielectric loss in-100-352℃.Therefore,our work provides a new route for pre-paring ultra-wide operating temperature capacitors at low manufacturing costs.

关键词： Na_(1/2)Bi_(1/2)TiO_(3) Permittivity Dielectric loss Ultra-wide operating temperature capacitors

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基于有限元法的水下航行器地磁异常模拟研究

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系统工程与电子技术 2024年第7期46卷 2191-2200页

作者：赵高阳刘勇朱平杰向冰周洪娟哈尔滨工业大学(威海)信息科学与工程学院山东威海264209 中国船舶集团有限公司第七二二研究所湖北武汉430205

为改进水下航行器磁异常探测技术中磁异常实测数据难获得、现有磁体模型计算精度不高等问题,基于有限元仿真探讨建立无需区分近、远场的高精度混合磁体模型方法。应用有限元数值方法仿真复杂结构水下航行器的空间磁异常分布,以磁场数值... 详细信息

为改进水下航行器磁异常探测技术中磁异常实测数据难获得、现有磁体模型计算精度不高等问题,基于有限元仿真探讨建立无需区分近、远场的高精度混合磁体模型方法。应用有限元数值方法仿真复杂结构水下航行器的空间磁异常分布,以磁场数值解为收敛目标,建立以偶极子阵元数目、位置及磁矩为参数的均匀磁化椭球体与偶极子阵列混合的航行器磁异常解析模型,采用非线性最小二乘算法求解模型系数。仿真结果表明,基于该模型得到磁异常计算值与全空间内数值解的拟合度较高,测试平面平均误差为3%。该模型在磁场延拓、高精度建模等方面可以进一步应用。

关键词：航空磁异常探测有限元仿真磁体模拟数值拟合

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Enhanced superconducting performance in solution-derived YBCO-BaZrO3composite film

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Progress in Natural Science:Materials International 2020年第2期30卷 180-184页

作者： Li Lei Limin Li Xiuting Wang zhao Zhang gaoyang zhao Jiqiang Jia Fuxue Yan Zongfan Duan Lihua Jin Chengshan Li Pingxiang Zhang Advanced Material Analysis and Test Center Xi'an University of Technology School of Material Science and Engineering Xi'an University of Technology Key Laboratory of Electrical Materials and Infiltration Technology of Shaanxi Province Northwest Institute for Nonferrous Metal Research

YBa2Cu3O7-δ/BaZrO3(YBCO/BZO) composite film with enhanced flux-pinning performance was prepared on LaAlO3(LAO) substrate via a fluorine-free sol-gel method in combination with a novel photosensitive sol-gel lithography technique.Owing to the difference of lattice mismatch between the interfaces of YBCO/LAO and YBCO/BZO,high-density stacking faults were successfully introduced into YBCO matrix,which has been confirmed by XRD and HRTEM analysis.Magnetization measurement results indicate that YBCO/BZO composite film has a stronger current-carrying capacity than the pure YBCO film especially under applied magnetic fields.However,the critical current density of YBCO/CeO2composite film is much lower than that of the pure YBCO film at all the applied magnetic fields due to the chemical reaction between YBCO and CeO2.Therefore,it can be concluded that the flux-pinning performance of YBCO film can be improved by the lattice distortions within YBCO matrix as long as the metal oxide microarrays cannot react with YBCO films.

关键词： Epitaxial growth Sol-gel preparation Superconductors Flux pinning YBCO

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Preparation of Bi-2212/YBCO heterostructure and their interfacial characters

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Superconductivity 2022年第4期4卷 7-13页

作者： Minghu Shen Li Lei gaoyang zhao Pengrong Ren Mengmeng Ren Man Wu Bo Deng School of Material Science and Engineering Xi’an University of TechnologyXi’anShaanxi 710048China Advanced Material Analysis and Test Center Xi’an University of TechnologyXi’anShaanxi 710048China

YBa_(2)Cu_(3)O_(7‐x)(YBCO)thin films were prepared on LaAlO_(3)(LAO)substrates by a sol–gel method,and the epitaxial growth of Bi‐2212 thin films on YBCO thin films was investigated.Both YBCO and Bi_(2)Sr_(2)Ca1Cu_(2)O_(8)+δ(Bi‐2212)bilayer films exhibit good biaxial texture and superconducting properties.Afterward,a cross‐shaped Bi‐2212/YBCO heterostructure was fabricated,and its interfacial atomic arrangement and I‐V characteristics were analyzed.Atomic‐resolution STEM images obtained from a spherical‐aberration‐corrected transmission electron microscope show that two superconducting films exhibit a layered structure and the atoms inside the films are artfully arranged.Moreover,the order of the seven atomic layers between Bi‐2212 and YBCO layers with a thickness of about 1.32 nm is misarranged.Among them,the Y‐O layer of YBCO and the Sr‐O layer of Bi‐2212 share a CuO_(2) layer.The I‐V curves of Bi‐2212/YBCO bilayer films show that the seven misarranged atomic layers at Bi‐2212/YBCO interface acts as a barrier layer,which means that a Josephson junction can be fabricated using this interface characters.

关键词： High‐temperature superconducting thin film Epitaxial growth Lattice mismatch Barrier layer Interface effect

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Effect of Firing Temperature on Microstructure and Superconductivity of YBCO Films Derived from Low-fluorine Solution

Effect of Firing Temperature on Microstructure and Supercond...

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中国材料大会2012

作者： Chuanbao Wu gaoyang zhao Yuanqing Chen Department of Materials Physics and Chemistry Xi’an University of Technology

ISBN: (纸本)9783037856079

Using a low-fluorine solution, YBa2Cu3O7-x（YBCO） superconducting films were prepared on LaAlO3（LAO） substrates by dip-coating method. YBCO films were fired at different temperatures with same oxygen pressure of 1.3 vol% and water vapor pressure of 7.4 vol%. Effect of firing temperature on film microstructure and superconductivity was investigated. The results indicated that YBCO films with high-degree c-axis orientation （the degree of c-axis orientation reached 96%） can be obtained when heat treated at 800 ℃. At this temperature YBCO films were grown on LAO with cubic-on-cubic mode, resulting in a high critical transition temperature （Tc） of 91.5 K, and critical current density （Jc） of lager than 1 MA/cm2 . However, when fired at lower temperatures, YBCO films trended to form a-axis grains, which degraded Jc of films. And a higher heat treatment temperature also depressed superconductivity of YBCO films.

关键词： YBa2Cu3O7-x Superconductor Orientation Critical current density.

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Fabrication of YBCO superconducting microarray by sol-gel process using photosensitive metal chelates

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Science China(Technological Sciences) 2013年第6期56卷 1409-1414页

作者： zhao gaoyang JIA JiQiang JIANG Fen LEI Li MA JunShan School of Materials Science and Engineering Xi'an University of Technology Advanced Materials Analysis and Test Center Xi'an University of Technology

We used yttrium acetate, barium acetate, and copper acetate as the starting materials, benzalacetone (BzAcH) as chemical modifier, and methanol (MEOH) as solvent to synthesize a stable fluorine-free YBCO precursor sol. The coated YBCO gel film using this precursor sol exhibited photosensitivity to UV irradiation at a wavelength of 330 nm. After the subsequent exposing, the YBCO gel film showed a decreased solubility in several organic solvents. Based on the photosensitivity of the YBCO/BzAcH gel film, YBCO superconducting microarray with the pitch of 5 μm was fabricated by irradiating the gel film with UV light through a mask, followed by leaching the unirradiated area in a mixture solvent of methanol and n-butyl alcohol with the volume ratio of 1:1. After proper heat treatment the x-ray diffraction result showed that the as-prepared arrays were highly c-axis oriented and with a high T c by this new photosensitive sol-gel process.

关键词： YBCO 凝胶工艺超导芯片金属螯合物溶胶感光制备紫外线照射

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Fabrication of inorganic film gratings and study on their diffraction properties

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Science China(Technological Sciences) 2008年第11期51卷 1995-2000页

作者： WANG ZheZhe zhao gaoyang MA JieYuan PENG HaiJun LI MeiLian School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China

A novel process for fabricating high-density and high diffraction efficiency inor- ganic gratings has been proposed by combining laser interference and chemical etching. In the present work, UV photosensitive Zr-contained sol was synthesized, and photosensitive ZrO2/BzAc gel films on (100) silicon were prepared using the sol-gel method. Subsequently, inorganic film gratings with a pitch of 1 μm were fabricated by laser interference in this photosensitive gel film combining with the process of heat treatment. In order to increase the depth-to-width ratio of the grat- ings, chemical etching was adopted by using iodine-saturated KOH as anisotropic etchant, which improved the diffraction efficiency of the gratings effectively. Fur- thermore, the diffraction efficiency was improved by gold coating to enhance the surface glossiness and reflection coefficient.

关键词： sol-gel high-density gratings laser interference chemical etching diffraction efficiency

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Preparation and Performance of Magneto-optical Glasses Doped with Tb^(3+)/Dy^(3+)

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Journal of Wuhan University of Technology(Materials Science) 2014年第4期29卷 684-687页

作者：殷海荣 zhao gaoyang LIU Pan WANG Shunni GUO Hongwei School of Materials Science and Engineering Xi'an University of Technology School of Materials Science and Engineering Shaanxi University of Science and Technology

In order to increase the content of rare-earth oxides in magneto-optical glass and improve the Verdet constant, the rare-earth doped ternary Ga2O3-B2O3-SiO2（GBS） system magneto-optical glasses were prepared by the melt quenching technique. The infl uence of Tb3＋ and Dy3＋ ions on the structure of GBS glasses was investigated using FTIR, DSC and Faraday rotations. The experimental results showed that the content of rare-earth oxides in the glasses with the double incorporation of Tb2O3 and Dy2O3 was higher. The crystallization parameter β achieved the maximum 0.48 with Tb3＋/Dy3＋ content of 35mol%. Terbium oxide existed mainly in [TbO3] units in the glasses and [TbO4] units were converted into [TbO3] with increasing Tb2O3 content. As Ga3＋ ion is larger than B3＋ ion in radius, leading to an increasing of the glass network gap and improvement in the ability of accommodating rare earth ions, Verdet constant increased.

关键词： magneto-optical glass faraday rotation rare earth oxide

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Mild and Low-Cost Synthetic Process for Monodispersive Platinum Nanoparitcles on Carbon Aerogel

Mild and Low-Cost Synthetic Process for Monodispersive Plati...

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2014中国功能材料科技与产业高层论坛

作者： Feng Li gaoyang zhao Ying Yang Gary Pattrick Richard Moutloali School of Material Science and Engineering Xi'an University of Technology College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

A mild synthetic process using formic acid as the reduction agent was applied to prepare 40 wt%Pt/carbon aerogel（CA）electrocatalyst.The as-prepared sample was characterized by transmission electron microscopy（TEM）and electrochemical measurements.The results exhibit Pt nanoparticles with narrow particle size distribution are dispersed throughout carbon aerogel structure.Moreover,the Pt/CA catalyst has smaller Pt nanoparticle mean size than Johnson Matthey HiSpecTM 4000（JM4000）.The electrochemical measurement results indicate that the Pt/CA catalyst with Pt loading of 40 wt%possesses similarelectrochemical surface area（ESA）value and oxygen reduction reaction（ORR）activity as JM4000.

关键词： Carbon aerogel PEM fuel cells Catalyst Platinum nanoparticles

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双轴应变对二维IV-VI硫族化合物电子特性的影响

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功能材料 2022年第1期53卷 1104-1111页

作者：郭颖赵高扬西安理工大学材料科学与工程学院西安710048 陕西理工大学物理与电信工程学院陕西汉中723001

利用密度泛函理论(density function theory,DFT)模拟计算了二维Ⅳ-Ⅵ硫族化合物(MXs:SnS、SnSe、SnTe、GeS、GeSe和GeTe)的本征结构和电子特性,重点研究了双轴应变对MXs的能带结构特点、带隙大小和费米能级的影响。发现应变对单层MXs... 详细信息

利用密度泛函理论(density function theory,DFT)模拟计算了二维Ⅳ-Ⅵ硫族化合物(MXs:SnS、SnSe、SnTe、GeS、GeSe和GeTe)的本征结构和电子特性,重点研究了双轴应变对MXs的能带结构特点、带隙大小和费米能级的影响。发现应变对单层MXs的色散关系影响不大,但是对带隙大小的影响较大,而且压缩应变对带隙的影响大于拉伸应变。同时应变还可以调节GeSe、GeTe、SnSe和SnTe的直接带隙与间接带隙之间的转换。在应变的作用下单层MXs的费米能级随应变系数ε值的增加而降低,且压缩应变的影响大于拉伸应变的影响。采用应变工程研究二维MXs电子特性的变化趋势能为下一步实验上设计出高性能的二维半导体器件提供理论依据。

关键词：密度泛函理论双轴应变单层MXs 带隙

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