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Phase Transformation in the Infinite Layer Structure Compound (Sr, Nd) CuO_(2) and its Effect on Superconductivity

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Chinese Physics Letters 1993年第8期10卷 503-506页

作者： ZHOU Xingjiang yao yushu LI JianqiXU Wei JIA Shunlian ZHAO Zhongxian National Laboratory for Superconductivity Institute of physics.Academia Sinicat Beijing 100030

Superconducting compound (Sr_(0.86)Nd_(0.14))CuO_(2 )with the infinite layer structure was synthesized under high *** tetragonal structure a×a transforms into a superstructure 2√2a ×2√2a when the sample was in situ heated in transmission electron microscope to about *** anormalous resistance change of the sample during heating in vacuum to 400℃ confinned the phase *** the superlattice formationf the sample lost its superconductivity and became semiconducting.

关键词： resistance Transformation structure

Superconductivity in a New(Sr,Y)CuO_(2) System Synthesized Under High Pressure

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Chinese Physics Letters 1994年第2期11卷 123-126页

作者： ZHOU Xingjiang yao yushu DONG Cheng LI Jingwei JIA Shunlian ZHAO Zhongxian National Laboratory for Superconductivity Institute of PhysicsAcademia SinicaBeijing 100080

Superconductivity has been observed in a new series(Sr_(1-x)Y_(x))CuO_(2)(x=0.00-0.30) synthesized under high pressure of 3.5GPa and 950℃.Compared with the previous(Sr_(1-x)Y_(x))CuO_(2)(Ln=Nd,Pr and La)series,this new series shows a broader superconducting composition range of x=*** onset transition temperature of this series is 36-38K.

关键词： x=0 K.

Synthesis of High Temperature Superconductors HgBa_(2)CuO_(4+y) and HgBa_(2)Ca_(2)Cu_(3)O_(8+y)

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Chinese Physics Letters 1994年第5期11卷 304-306页

作者： yao yushu SU Yanjing JIA Shunlian CAO Guohui WU Fei ZHAO Zhongxian National Laboratory for Superconductivity Institute of PhysicsAcademia SinicaBeijing 100080 Department of Materials Physics University of Sciences and Technology of BeijingBeijing 100083

High critical temperature superconductors of mercury-based system were synthesized under high pressure and high *** resistance and ac magnetic susceptibility measurements for sample prepared at 25 kbar and 850℃for 1.5 h show that the sample without any added treatment was a mixture of Hg-1201 and *** Tc values of Hg-1223 phase and Hg-1201 phase are 132 and 98 K,respectively.

关键词： temperature mercury susceptibility

Low-temperature magnetic anomalies of oxygen-doped T′-type 214 compounds

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Chinese Science Bulletin 1998年第15期43卷 1272-1276页

作者： Yufeng Xiong Duo Jin yushu yao shuquan Guo Fei Wu Zhongxian Zhao Chinese Acad Sci Cryogen Lab Beijing 100080 Peoples R China Chinese Acad Sci Inst Phys State Key Lab Superconduct Beijing 100080 Peoples R China

A new low_temperature anomalous magnetism at about 29 K for the oxygen doped (Eu 1- x Y x ) 2CuO 4 and Sm 2CuO 4, prepared under high pressure, has been investigated. This anomaly originated from different mechanisms to weak ferromagnetism (WF) behavior of T′ phase, and should be assigned to the ferromagnetic clusters formed by doped holes.

关键词： superconductor high pressure weak ferromagnetism.

Formation of Superconducting Phases in Electron-Doped Nd_(1.85)Ce_(0.15)CuO_(4-y)

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Chinese Physics Letters 1993年第1期10卷 53-56页

作者： yao yushu JIN Changqing WU Bingqing WANG Wenkui ZHAO Zhongxian Institute of Physics Academia SinicaBeijing 100080

The effect of annealing process in flowing nitrogen on the formation of super-conducting phases in Nd_(1.85)Ce_(0.15)CuO_(4-y) has been *** super-conductingphases with onset temperature Tcons of about 15 and 25K might be formed when the samples were annealed at various temperatures ranging from 850℃ to 870℃ and from 880℃ to 920℃,*** dependence of Tcons on the annealing temperature was reported.

关键词： annealing Electron conducting

TWO STRUCTURAL PHASE TRANSITIONS IN THE SUPERCONDUCTING MATERIALS Bi_(1-x)Pb_(x)SrCaCu_(2)O_(y)(x=0,0.2)

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Chinese Physics Letters 1989年第1期6卷 39-42页

作者： CHEN Qi LI Jianqi yao yushu HUANG Xingming ZHAO Zhongxian WANG Wenkui Institute of Physics Academia SinicaBeijing

The structural transition process of the superconducting phase in Bi_(1-x)Pb_(x)SrCaCu_(2)O_(y)(x=0,0.2)samples has been investigated at temperatures ranging from-190℃ to 800℃ by means of electron *** struc-tures about 310℃ and 490℃ respectively for the BiSrCaCu_(2)O_(y) sample,and about 310℃ and 470℃ for the Bi_(0.8)Pb_(0.2)SrCaCu_(2)O_(y) *** these transitions a new structural phase forms.

关键词： diffraction x=0

Grain evolution of nano-crystals ZnO under HP and HT

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Science China(Physics,Mechanics & Astronomy) 2006年第3期49卷 281-290页

作者： SHAO Guangjie1, QIN Xiujuan1, LIU Riping1, WANG Wenkui1,2 & yao yushu2 1. Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China 2. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao China Institute of Physics Chinese Academy of Sciences Beijing China

Grain evolution of nano-crystals ZnO under high temperature and pressure is studied using a cubic high pressure apparatus. The structure, grain sizes and morphology of the samples are characterized by X-ray diffraction and field emission scanning electron microscopy. The results show that the grain sizes of ZnO grow rapidly at temperature 200℃ under pressure. At temperature lower than 300 ℃ (including 300 ℃), the grain sizes of the samples first increase with the pressure increasing from 1 to 3 GPa and later de- crease from 4 to 6 GPa. The activation volume from 1 to 3 GPa and from 4 to 6 GPa is calculated respectively using the phenomenological kinetic grain growth equation at temperature 300 ℃. At temperature higher than 400℃ (including 400 ℃), the grain sizes of the samples increase with the pressure increasing from 1 to 6 GPa. ZnO nano-bulks with good quality can be obtained under the specific conditions.

关键词： nano-crystals ZnO,high temperature and pressure,grain evolution

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英语专业综合英语课程探析

科教导刊 2018年第32期 135-136页

作者：姚喻舒川北幼儿师范高等专科学校四川广元628017

综合英语是高等学校英语专业的一门核心课程,具有综合性和长期性的特点,它与英语单项技能课(听说读写译课程)有重复内容,但又不同于单项技能课,其教学存在很多问题,如教学目标不容易把握,教学内容没有新意,教学实施没有特色等。本文旨... 详细信息

综合英语是高等学校英语专业的一门核心课程,具有综合性和长期性的特点,它与英语单项技能课(听说读写译课程)有重复内容,但又不同于单项技能课,其教学存在很多问题,如教学目标不容易把握,教学内容没有新意,教学实施没有特色等。本文旨在对综合英语课程进行分析,针对问题提出课程教学实施建议,提升综合英语课程教学效果。

关键词：综合英语教学目标教学内容教学方法

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评判性阅读在高职英语教学中的应用

科教导刊 2020年第31期 106-107页

作者：姚喻舒川北幼儿师范高等专科学校四川广元628017

英语课程改革是高职英语专业人才培养的重要环节之一。英语教学中开展评判性阅读教学能够促进学生阅读理解能力的提高和学生语言综合素质的培养。本文从评判性阅读教学的概念和教学策略入手,对合理增强教学效果,促进学生阅读能力培养的... 详细信息

英语课程改革是高职英语专业人才培养的重要环节之一。英语教学中开展评判性阅读教学能够促进学生阅读理解能力的提高和学生语言综合素质的培养。本文从评判性阅读教学的概念和教学策略入手,对合理增强教学效果,促进学生阅读能力培养的措施进行分析,希望能够为英语教学改革提供参考和借鉴。

关键词：高职英语评判性阅读阅读策略