鐵酸鉍基多鐵性材料的制備與電磁性能研究
發(fā)布時(shí)間：2018-11-13 20:04
【摘要】：磁性材料與電子材料得到越來越廣泛的應(yīng)用,隨著科學(xué)技術(shù)的迅猛發(fā)展,更迫切的需要器件的小型化、高度集成化以及多功能化。這種實(shí)際應(yīng)用中的需求導(dǎo)致科研人員們開展越來越多的關(guān)于集磁性和電性于一身的這類多功能材料的研究。多鐵性材料,它同時(shí)擁有多種鐵性,而且各種鐵性之間可以通過相互耦合協(xié)同作用,來實(shí)現(xiàn)更多維度的序參量之間的調(diào)節(jié),如磁電效應(yīng)(即材料可以通過改變外磁場大小來調(diào)節(jié)電極化強(qiáng)度,或者通過改變外電場大小來調(diào)節(jié)磁極化強(qiáng)度),通過各序參量之間的耦合作用把獨(dú)立的物理參數(shù)磁化強(qiáng)度和電極化強(qiáng)度等可以表征信息的極化矢量緊密地聯(lián)系起來,這就為磁電功能材料提供了額外可操控的自由度,有望開發(fā)新型信息存儲功能器件。多鐵性磁電耦合材料在新型功能器件以及信息存儲器件等領(lǐng)域有著廣泛的應(yīng)用前景。在凝聚態(tài)物理中,多鐵現(xiàn)象本身就是一個(gè)值得研究的問題,它對電學(xué)、磁學(xué)以及強(qiáng)關(guān)聯(lián)電子體系提出很多挑戰(zhàn),逐漸成為量子調(diào)控領(lǐng)域的熱點(diǎn)研究問題。BiFeO3是同時(shí)在室溫以上表現(xiàn)出多鐵性的材料體系,因此從2003年至今得到了廣泛而深入的研究,并成為推動(dòng)當(dāng)前多鐵性研究熱潮最主要的材料體系。由于高溫下Bi易揮發(fā),這會(huì)使Fe離子產(chǎn)生變價(jià),導(dǎo)致純相的BiFe03塊材難以制備,并且存在氧空位等缺陷,樣品表現(xiàn)出較大的漏電流,一般鐵電性能都不理想;另外BiFeO3具有特殊空間調(diào)制螺旋結(jié)構(gòu)和傾斜G型反鐵磁序,使其呈現(xiàn)室溫反鐵磁性,這些都嚴(yán)重阻礙其潛在的應(yīng)用。為了解決這些困難,需要對該類材料進(jìn)行制備方法的優(yōu)化或摻雜改性以期望提高BiFeO3陶瓷的電學(xué)和磁學(xué)性能。本論文針對目前多鐵性材料的研究現(xiàn)狀,以BiFeO3多鐵性材料為基礎(chǔ)、主要從制備方法的改進(jìn)、材料摻雜取代改性以及引入其他鈣鈦礦結(jié)構(gòu)形成固溶體三個(gè)方面開展研究工作,對BiFeO3-BaTiO3固溶體,以及由2BiFeO3-Bi4Ti3O12組成的鉍層狀A(yù)urivillius結(jié)構(gòu)化合物Bi6Fe2Ti3O18兩種材料進(jìn)行系統(tǒng)的研究,期望增強(qiáng)其鐵電性能并在此基礎(chǔ)上進(jìn)一步實(shí)現(xiàn)室溫鐵電、鐵磁共存。主要研究工作和取得的成果如下:(1)制備了0.67BiFeO3-0.33BaTiO3固溶體,對其結(jié)構(gòu)、微觀形貌、介電、磁性質(zhì)以及復(fù)阻抗等性能進(jìn)行系統(tǒng)的研究,發(fā)現(xiàn)通過淬火工藝可以有效減小0.67BiFeO3-0.33BaTiO3的漏電流,提高體系的鐵電性能。(2)制備了 2BiFe03-Bi4Ti3O12層狀A(yù)urivillius結(jié)構(gòu)化合物以及Fe位Ni摻雜的樣品,系統(tǒng)研究Ni摻雜量對其結(jié)構(gòu)、微觀形貌、介電、磁等性能的影響。發(fā)現(xiàn)Ni摻雜Bi6Fe2Ti3O18可以有效改善體系的漏電流,并且實(shí)現(xiàn)了室溫下鐵電、鐵磁共存。(3)使用電泳沉積法在金屬基片上制備了 Bi6Fe2Ti3O18厚膜,對其制備工藝進(jìn)行了探索,研究了 Bi6Fe2Ti3O18厚膜的微結(jié)構(gòu)和鐵電性能。發(fā)現(xiàn)厚膜存在致密性的問題,導(dǎo)致漏電流較大而無法獲得較好的電滯回線。在此基礎(chǔ)上提出了一些可行性的改進(jìn)方案,后續(xù)需要進(jìn)一步優(yōu)化制備工藝。
[Abstract]:With the rapid development of science and technology, the magnetic material and the electronic material are more and more widely used. With the rapid development of science and technology, the miniaturization, high integration and multi-function of the device are more and more urgent. The need in this practical application has led to a growing number of research on both magnetic and electrical-based multi-function materials. in that multi-polar material, the multi-dimension material has a plurality of magnetic field at the same time, and can be mutually coupled with each other to realize the adjustment between a more multi-dimensional sequence parameter, such as a magnetoelectric effect (that is, the material can adjust the electric polarization intensity by changing the size of the external magnetic field, or by changing the size of the external electric field to adjust the magnetic polarity strength), the independent physical parameter magnetization and the electric polarization intensity and the like can be closely associated with the polarization vector of the information through the coupling action between the sequence parameters, This provides an additional manipulable degree of freedom for magnetoelectric functional materials and is expected to develop a new type of information storage functional device. The multi-phase magnetoelectric coupling material has a wide application prospect in the fields of novel functional devices and information storage devices and the like. In the condensed matter physics, the phenomenon of multi-iron is a problem to be studied, and it poses a lot of challenges to the electrical, magnetic and strong-associated electronic systems, and has become a hot topic in the field of quantum control. BiFeO3 is one of the most important material systems at the same time at room temperature, so it has been widely and deeply studied since 2003, and has become the most important material system to promote the current multi-channel research. As the Bi is more volatile at high temperature, the valence of the Fe ions can be changed, which leads to the difficult preparation of the BiFe03 bulk material of the pure phase, and the defects such as oxygen vacancy and the like are present, and the sample shows a large leakage current, and the general ferroelectric property is not ideal; in addition, that BiFeO3 has a special space-modulation spiral structure and an inclined G-type anti-ferromagnetic order, so that the BiFeO3 exhibit room-temperature antiferromagnetism, which all seriously hinder its potential application. In order to solve these difficulties, it is necessary to optimize or dope the material to a desired improvement in the electrical and magnetic properties of the BiFeO3 ceramic. Based on BiFeO3 multi-source material, this paper is based on BiFeO3 multi-source material, and mainly studies the three aspects of the preparation method, material doping and modification, and the introduction of other perovskite structure to form a solid solution, and the BiFeO3-BaTiO3 solid solution is prepared. The two materials, Bi6Fe2Ti3O18, which are composed of 2BiFeO3-Bi4Ti3O12 and Bi6Fe2Ti3O18, are studied. The main research work and the results are as follows: (1) The solid solution of 0.67BiFeO3-0.33BaTiO3 is prepared, and its structure, micro-morphology, dielectric, magnetic properties and complex impedance are systematically studied. It is found that the leakage current of 0.67BiFeO3-0.33BaTiO3 can be effectively reduced through the quenching process, and the ferroelectric property of the system can be improved. (2) 2BiFe03-Bi4Ti3O12 layered Auritilius structural compound and Fe-bit Ni-doped sample were prepared, and the effect of Ni doping on its structure, micro-morphology, dielectric and magnetic properties was studied. It is found that Ni-doped Bi6Fe2Ti3O18 can effectively improve the leakage current of the system and realize the coexistence of iron and iron at room temperature. (3) Bi6Fe2Ti3O18 thick film was prepared on the metal substrate by the method of electrophoretic deposition, and the preparation process of Bi6Fe2Ti3O18 was studied. The microstructure and electrical properties of the Bi6Fe2Ti3O18 thick film were studied. it is found that the thick film has a problem of compactness, which leads to a large leakage current and a better electric hysteresis loop can not be obtained. On this basis, some feasible improvement schemes are put forward, and the preparation technology needs to be further optimized.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O482
本文編號：2330285
[Abstract]:With the rapid development of science and technology, the magnetic material and the electronic material are more and more widely used. With the rapid development of science and technology, the miniaturization, high integration and multi-function of the device are more and more urgent. The need in this practical application has led to a growing number of research on both magnetic and electrical-based multi-function materials. in that multi-polar material, the multi-dimension material has a plurality of magnetic field at the same time, and can be mutually coupled with each other to realize the adjustment between a more multi-dimensional sequence parameter, such as a magnetoelectric effect (that is, the material can adjust the electric polarization intensity by changing the size of the external magnetic field, or by changing the size of the external electric field to adjust the magnetic polarity strength), the independent physical parameter magnetization and the electric polarization intensity and the like can be closely associated with the polarization vector of the information through the coupling action between the sequence parameters, This provides an additional manipulable degree of freedom for magnetoelectric functional materials and is expected to develop a new type of information storage functional device. The multi-phase magnetoelectric coupling material has a wide application prospect in the fields of novel functional devices and information storage devices and the like. In the condensed matter physics, the phenomenon of multi-iron is a problem to be studied, and it poses a lot of challenges to the electrical, magnetic and strong-associated electronic systems, and has become a hot topic in the field of quantum control. BiFeO3 is one of the most important material systems at the same time at room temperature, so it has been widely and deeply studied since 2003, and has become the most important material system to promote the current multi-channel research. As the Bi is more volatile at high temperature, the valence of the Fe ions can be changed, which leads to the difficult preparation of the BiFe03 bulk material of the pure phase, and the defects such as oxygen vacancy and the like are present, and the sample shows a large leakage current, and the general ferroelectric property is not ideal; in addition, that BiFeO3 has a special space-modulation spiral structure and an inclined G-type anti-ferromagnetic order, so that the BiFeO3 exhibit room-temperature antiferromagnetism, which all seriously hinder its potential application. In order to solve these difficulties, it is necessary to optimize or dope the material to a desired improvement in the electrical and magnetic properties of the BiFeO3 ceramic. Based on BiFeO3 multi-source material, this paper is based on BiFeO3 multi-source material, and mainly studies the three aspects of the preparation method, material doping and modification, and the introduction of other perovskite structure to form a solid solution, and the BiFeO3-BaTiO3 solid solution is prepared. The two materials, Bi6Fe2Ti3O18, which are composed of 2BiFeO3-Bi4Ti3O12 and Bi6Fe2Ti3O18, are studied. The main research work and the results are as follows: (1) The solid solution of 0.67BiFeO3-0.33BaTiO3 is prepared, and its structure, micro-morphology, dielectric, magnetic properties and complex impedance are systematically studied. It is found that the leakage current of 0.67BiFeO3-0.33BaTiO3 can be effectively reduced through the quenching process, and the ferroelectric property of the system can be improved. (2) 2BiFe03-Bi4Ti3O12 layered Auritilius structural compound and Fe-bit Ni-doped sample were prepared, and the effect of Ni doping on its structure, micro-morphology, dielectric and magnetic properties was studied. It is found that Ni-doped Bi6Fe2Ti3O18 can effectively improve the leakage current of the system and realize the coexistence of iron and iron at room temperature. (3) Bi6Fe2Ti3O18 thick film was prepared on the metal substrate by the method of electrophoretic deposition, and the preparation process of Bi6Fe2Ti3O18 was studied. The microstructure and electrical properties of the Bi6Fe2Ti3O18 thick film were studied. it is found that the thick film has a problem of compactness, which leads to a large leakage current and a better electric hysteresis loop can not be obtained. On this basis, some feasible improvement schemes are put forward, and the preparation technology needs to be further optimized.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O482
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