电化学反应调控钴酸锶薄膜相变及其物理性质变化
发布时间：2021-11-01 01:10
过渡金属氧化物由于其独特的电学、磁学特性和广阔的应用前景引起人们的广泛关注并被研究了许多年。氧空位是氧化物中常见的一种缺陷,可以显著地影响这些材料的结构及性质,尤其是有序的氧空位。许多研究人员采用多种方法来调节氧化物中的氧空位以便调控其性质,如掺杂、退火处理、应变调控、离子注入等。在本文中,我们提出了一种利用电化学反应来调节SrCoO3-δ（SCO）中的氧含量及其相变的方法。本文的研究对象为SrCoO3-δ薄膜,SCO存在钙铁石相（BM-SCO）和钙钛矿相（P-SCO）两种稳定的相。其中钙铁石相的SCO为单斜结构,它的晶格常数为a=5.5739?、b=5.4697?、c=15.7450?,可以将它视为赝四方结构,这种结构的晶格常数为at=3.905?和ct/2=3.936?。而钙钛矿相的SCO是立方结构,它的晶格常数为a=3.836?。根据文献报道,钙铁石相SCO是一种反铁磁的、绝缘的氧化物,而钙钛矿相SCO则是一种铁磁的、金属性的氧化物。选取SrTiO3（STO）作为衬底,S...
【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校
【文章页数】：86 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter1 Introduction
1.1 Research background and significance of the research
1.2 The progress and achievements in the related fields
1.2.1 Substitution of A-site atoms in ABO_3
1.2.2 Post-treatment
1.2.3 Strain engineering
1.2.4 Ion injection
1.2.5 Other methods
1.3 The known properties of SrCoO3-δ
1.4 The main content of this thesis
Chapter2 Equipment and sample preparation
2.1 Equipment
2.1.1 Pulsed laser deposition
2.1.2 Atomic force microscopy
2.1.3 X-ray diffraction
2.1.4 Equipment for electric,magnetic and optical measurement
2.1.5 Electrochemical workstation
2.1.6 Method for in-situ observation
2.2 Sample preparation and characterization
2.2.1 Substrate selection and epitaxial relationship
2.2.2 Thin film growth
2.3 Conclusions
Chapter3 Control of phase transition by electrochemical reaction
3.1 Changes in SCO thin film under different voltages
3.1.1 Motivations
3.1.2 Transition from BM-SCO to P-SCO
3.1.3 Transition from P-SCO to BM-SCO
3.2 Phase transition by a constant voltage
3.2.1 Motivations
3.2.2 Transition from BM-SCO to P-SCO
3.2.3 Transition from P-SCO to BM-SCO
3.3 Discussion
3.3.1 Advantages
3.3.2 Disadvantages
3.4 Conclusions
Chapter4 Measurements of physical properties during phase transition
4.1 Electrical properties
4.1.1 Results and discussion
4.1.2 Possible application
4.2 Magnetic properties
4.3 Optical properties
4.3.1 Results and discussion
4.3.2 Possible application
4.4 Conclusions
Conclusions
References
Acknowledgements
本文编号：3469226
【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校
【文章页数】：86 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter1 Introduction
1.1 Research background and significance of the research
1.2 The progress and achievements in the related fields
1.2.1 Substitution of A-site atoms in ABO_3
1.2.2 Post-treatment
1.2.3 Strain engineering
1.2.4 Ion injection
1.2.5 Other methods
1.3 The known properties of SrCoO3-δ
1.4 The main content of this thesis
Chapter2 Equipment and sample preparation
2.1 Equipment
2.1.1 Pulsed laser deposition
2.1.2 Atomic force microscopy
2.1.3 X-ray diffraction
2.1.4 Equipment for electric,magnetic and optical measurement
2.1.5 Electrochemical workstation
2.1.6 Method for in-situ observation
2.2 Sample preparation and characterization
2.2.1 Substrate selection and epitaxial relationship
2.2.2 Thin film growth
2.3 Conclusions
Chapter3 Control of phase transition by electrochemical reaction
3.1 Changes in SCO thin film under different voltages
3.1.1 Motivations
3.1.2 Transition from BM-SCO to P-SCO
3.1.3 Transition from P-SCO to BM-SCO
3.2 Phase transition by a constant voltage
3.2.1 Motivations
3.2.2 Transition from BM-SCO to P-SCO
3.2.3 Transition from P-SCO to BM-SCO
3.3 Discussion
3.3.1 Advantages
3.3.2 Disadvantages
3.4 Conclusions
Chapter4 Measurements of physical properties during phase transition
4.1 Electrical properties
4.1.1 Results and discussion
4.1.2 Possible application
4.2 Magnetic properties
4.3 Optical properties
4.3.1 Results and discussion
4.3.2 Possible application
4.4 Conclusions
Conclusions
References
Acknowledgements
本文编号：3469226
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