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Preparation of Epitaxial ktn Thin Films by Sol-Gel Process

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Chinese Science Bulletin 1993年第7期38卷 550-553页

作者：包定华邝安祥顾豪爽王世敏 Department of Physics Hubei University Wuhan 430062 PRC

1 Introduction The Sol-Gel process has received a great deal of attention, primarily because it can offer many advantages over the conventional process, such as high purity, molecular-level homogeneity, easier composition control and reduced processing temperature. These advantages make Sol-Gel process become one of the promising fabrication methods for ferroelectric ceramics. Sol-Gel-derived thin films of BaTiO3, PbTiO3, Pb （Zr, Ti）O3, PLZT and others have all been reported, but there is little information relating to the potential

关键词： ktn thin film Sol-Gel process epitaxial growth.

透明ktn薄膜的PLD法制备及其铁电性能研究

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Chinese Journal of Chemical Physics 2005年第4期18卷 599-604页

作者：王晓东彭晓峰张端明清华大学热能工程系相变与界面传递现象实验室北京100084 华中科技大学物理系武汉430074

用Sol Gel法制备ktn多晶粉末,在富氧气氛下烧结富钾ktn陶瓷,代替ktn单晶作为靶材,用PLD技术结合后期退火技术,在透明石英单晶(100)上制备出高取向的透明ktn薄膜,对薄膜厚度、折射率、伏～安(I～V)特性、介电特性进行了测试与分析.I～V... 详细信息

用Sol Gel法制备ktn多晶粉末,在富氧气氛下烧结富钾ktn陶瓷,代替ktn单晶作为靶材,用PLD技术结合后期退火技术,在透明石英单晶(100)上制备出高取向的透明ktn薄膜,对薄膜厚度、折射率、伏～安(I～V)特性、介电特性进行了测试与分析.I～V特性表明,低电场强度下,I～V服从欧姆定律,高电场强度下,I～V服从平方关系,可用空间电荷限制电流模型解释.电容～测试电场频率(C～F)特性表明,低频电容色散大,高频色散小,10kHz时介电常数为12600.

关键词： PLD ktn 薄膜石英单晶

Dynamic relaxation process of a 3D super crystal structure in a Cu:ktn crystal

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Chinese Optics Letters 2020年第2期18卷 61-65页

作者： Quanxin Yang Xin Zhang Hongliang Liu Xuping Wang Yingying Ren Shan He Xiaojin Li Pengfei Wu Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300071China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China

In this Letter,we report the existence and relaxation properties of a critical phenomenon on called a 3D super crystal that emerges at T=TC?3.5℃,that is,in the proximity of the Curie temperature of a Cu:ktn *** dynamics processes of a 3D super crystal manifest in its formation containing polarized nanometric regions and/or polarized ***,with strong coupling and interaction of microcomponents,the characteristic relaxation time measured by dynamic light scattering demonstrates a fully new relaxation mechanism with a much longer relaxation *** the relaxation mechanism of a relaxator is so-far undetermined,this research provides a novel *** results can help structure a fundamental theory of ferroelectric relaxation.

关键词： ktn relaxation time dynamic light scattering micronano structure

Field-induced transformation of ferroelectric domain states in ktn crystal

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Chinese Optics Letters 2021年第11期19卷 77-81页

作者： Quanxin Yang Xiaojin Li Hongliang Liu Yingying Ren Pengfei Wu Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Institute of Modern OpticsNankai UniversityTianjin 300350China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

We report an interesting study of electric-field-induced transformation from a single domain ferroelectric state to the multiple domain ferroelectric state in a KTa_(1-x)Nb_(x)O_(3)(ktn) crystal. Experimental results obtained using the confocalμ-Raman spectroscopy confirm the dynamic change of lattice structures induced by an external electric ***, the dependence of relative permittivity on the applied voltage also indicates the transformation of ferroelectric states involving the processes of splintering, inversion, and re-formation of ferroelectric domains.

关键词： ktn ferroelectric state domain state transformation field-induced phenomenon

High-Speed Time-Domain En Face Optical Coherence Tomography System Using ktn Optical Beam Deflector

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Optics and Photonics Journal 2019年第5期9卷 53-59页

作者： Masato Ohmi Yusuke Shinya Jun Miyazu Seiji Toyoda Tadashi Sakamoto Course of allied Health Science Graduate school of Medicine Osaka University Yamadaoka Suita Osaka Japan NTT Device Innovation Center NTT Corporation Morinosato Wakamiya Atsugi Kanagawa Japan

We developed high-speed time-domain (TD) en face optical coherence tomography (OCT) system using ktn optical beam deflector. The ktn optical beam deflector operates at a high repetition rate of 200 kHz with a fairly large beam deflection angle. We proposed a high-speed en face OCT system that used a ktn optical deflector as the sample beam scanning. In the experiment, we obtained en face OCT images of human fingerprint with a frame rate of 800 fps, which is the fastest speed obtained by a TD-OCT imaging. Furthermore, a 3D-OCT image was also obtained at 0.2 s (=5 volumes/s) by our imaging system.

关键词： Optical Coherence Tomography En Face OCT ktn Optical Beam Deflector

Development of Optical Coherence Tomography Using ktn Optical Probe

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Optics and Photonics Journal 2017年第5期7卷 85-91页

作者： Eunjoo Choi Masato Ohmi Takayuki Komatsu Shogo Yagi Kazuo Fujiura Course of Allied Health Science Graduate School of Medicine Osaka University Suita Osaka Japan NTT Advanced Technology Corporation Atsugi Kanagawa Japan

We have developed optical coherence tomography system with ktn optical probe for a diagnosis in the orthopedic surgery fields. The present system demonstrates that biological image was measured by using ktn optical scanner for having degree of freedom in sample arm as optical coherence tomography. In addition, the developed optical coherence tomography (OCT) system has shown feasibility for imaging biological tissue in orthopedics. The system was shown to have a resolution 14.2 μm for biological tissue in few mm depths. The sensitivity to be measured is 92.3 dB.

关键词： ktn Optical Probe Optical Coherence Tomography Imaging System

High-Speed Optical Coherence Tomography System Using a 200-kHz Swept Light Source with a ktn Deflector

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Optics and Photonics Journal 2013年第2期3卷 190-193页

作者： Yuichi Okabe Yuzo Sasaki Masahiro Ueno Takashi Sakamoto Seiji Toyoda Junya Kobayashi Masato Ohmi Graduate School of Medicine Course of Allied Health Science Osaka University Osaka Japan NTT Photonics Laboratories Nippon Telegraph and Telephone Corporation Kanagawa Japan

We demonstrate a high-speed swept-source optical coherence tomography (SS-OCT) system, which is based on a high-speed swept light source and a Mach-Zehnder interferometer with a high-speed photodetector. The light source is an external-cavity laser tuned by a ktn electro-optic deflector, which exhibits a very fast response and large deflection. The scanning wavelength range is almost 80 nm up to 200 kHz with a ±400-V deflector driving voltage. The system acquires 1 mm × 1 mm images consisting of 200 × 200 pixels within few milliseconds. We present preliminary SS-OCT images of an in-vitro human nail and an in-vivo finger pad.

关键词： Swept-Source Optical Coherence Tomography ktn New Light Source

组分非梯度ktn热释电薄膜的制备及其性能研究

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功能材料 2004年第Z1期35卷 1352-1354,1357页

作者：王世敏董兵海许祖勋傅晶吴会光湖北大学化学与材料学院湖北武汉430062 湖北大学化学与材料学院湖北武汉430062 湖北大学化学与材料学院湖北武汉430062 湖北大学化学与材料学院湖北武汉430062 湖北大学化学与材料学院湖北武汉430062

为使ktn热释电薄膜能够在较宽的温度范围内有较高的热释电系数,本文在Pt/Ti/SiO2/Si基片上采用Sol-Gel法制备了两种多组分成分非梯度分布的ktn热释电薄膜.用XRD分析了薄膜的晶相结构,并研究了其铁电、介电和热释电性能.结果表明,两种薄... 详细信息

为使ktn热释电薄膜能够在较宽的温度范围内有较高的热释电系数,本文在Pt/Ti/SiO2/Si基片上采用Sol-Gel法制备了两种多组分成分非梯度分布的ktn热释电薄膜.用XRD分析了薄膜的晶相结构,并研究了其铁电、介电和热释电性能.结果表明,两种薄膜均具有钙钛矿型结构,且均可观察到典型的电滞回线.在100kHz频率下,Ⅰ型薄膜在16～43℃,εr=332,tg δ=0.21,14～46℃平均热释电系数为3.246×10-4C/(cm2·K),计算所得Fv=3.58×10-7C·cm/J,Fd=1.42×10-5C·cm/J,Ⅱ型薄膜在17～46℃,εr=987,tgδ=0.18,14～44℃平均热释电系数为2.797×10-4C/(cm2·K),电压响应优值为1.04×10-7C·cm/J,探测度优值为7.69×10-6C·cm/J.

关键词：组分非梯度 ktn 热释电薄膜制备性能

用脉冲准分子激光在P-Si(100)衬底上沉积高取向ktn薄膜

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科学通报 1998年第3期43卷 259-262页

作者：马卫东王世敏张端明刘素铃王新兵徐启杨李再光田虎永华中理工大学物理系武汉430074 华中理工大学激光技术国家重点实验室武汉430074

利用Sol Gel法制备了优质ktn陶瓷靶材 ,用PLD技术成功地在P Si(10 0 )衬底上沉积出了较纯净钙钛矿相 (>98% )的ktn薄膜 ,并对所制备的薄膜进行了XRD 。

关键词：薄膜焦绿石相钙钛矿相脉冲激光沉积 ktn