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张可,邢璐瑶,吴增远,吕世英,马怡萌,苏健,宋桂林.K1-xCaxNbO3 陶瓷的晶体结构、介电特性及磁性的研究[J].低温物理学报,2020,(5):250-259. [点击复制]
- ZHANG Ke,XING Luyao,WU Zegnyuan,LV Shiying,MA Yimeng,SU Ju,SONG Guilin.Study on the Crystal Structure, High Temperature Dielectric Properties and Magnetic Properties of K1-xCaxNbO3 ceramics[J].LOW TEMPERATURE PHYSICAL LETTERS,2020,(5):250-259. [点击复制]
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| K1-xCaxNbO3 陶瓷的晶体结构、介电特性及磁性的研究 |
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张可1, 邢璐瑶1, 吴增远1, 吕世英1, 马怡萌2, 苏健3, 宋桂林4
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| (1.河南师范大学物理学院,河南省光伏材料重点实验室,新乡453007;2.河南师范大学物理学院,河南省光伏材料重点实验室,新乡453008;3.河南师范大学物理学院,河南省光伏材料重点实验室,新乡453009;4.河南师范大学物理学院,河南省光伏材料重点实验室,新乡453010) |
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| 摘要: |
| 采用自牺牲法制备K1-xCaxNbO3(x=0-0.2)陶瓷样品,研究Ca2+ 掺杂对KNbO3 的晶体结构,介电和磁性的影响.XRD分析表明所有样品均属于空间群为Amm2的单相正交晶系,SEM 表明Ca2+ 掺杂对KNO 样品的微观形貌和晶粒尺寸有明显的调控作用.在KNbO3 的εr-T中观察到两个转变,第一转变在213℃,第二转变在424℃,分别对应正交相到四方相转变和四方相到立方相的铁电相变,其TC随着x的增加由424℃降低到415℃.测量了K1-xCaxNbO3(x=0-0.2)样品在5~350K范围内M-T 的变化关系,发现M 值在T | Td 为负值是抗磁性,通过测试M-H 变化关系给予证实,对KNbO3 室温下呈现抗磁性提供了实验依据. |
| 关键词: KNbO3,晶体结构相变,介电特性,磁滞回线 |
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| Study on the Crystal Structure, High Temperature Dielectric Properties and Magnetic Properties of K1-xCaxNbO3 ceramics |
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ZHANG Ke1, XING Luyao1, WU Zegnyuan1, LV Shiying1, MA Yimeng2, SU Ju3, SONG Guilin4
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| (1.Henan Key laboratory of Photovoltail Materials, School of Physics, Henan Normal University, Xinxiang 453007, China;2.Henan Key laboratory of Photovoltail Materials, School of Physics, Henan Normal University, Xinxiang 453008, China;3.Henan Key laboratory of Photovoltail Materials, School of Physics, Henan Normal University, Xinxiang 453009, China;4.Henan Key laboratory of Photovoltail Materials, School of Physics, Henan Normal University, Xinxiang 453010, China) |
| Abstract: |
| K1-xCaxNbO3(x=0-0.2) ceramic samples were prepared by self-sacrifice method to study the effects of Ca2+ doping on the crystal structure, dielectric properties and magnetic phase transition of KNbO3. XRD analysis showed that all samples belong to a single-phase orthogonal crystal system with a spatial group of Amm2. The valence states of K, Nb and O elements, the atomic proportion in K1-Ca, NbO3(x=0-0.2) samples, and the relationship between the binding energies of K, Nb and O and x were studied through XPS. SEM showed that Ca2+ doping had a significant regulation effect on the micromorphology and grain size of KNO samples. Two transitions were observed in εr-T of KNbO3, the first transition was at 213 C and the second transition was at 424℃， corresponding to the ferroelectric phase transition from the orthogonal phase to the tetragonal phase and from the tetragonal phase to the cubic phase, respectively. The Tc decreased from 424℃ to 415℃ with the increase of x. The variation relationship of M-T of K1-xCaxNbO3(x=0-0.2) samples within the range of 5-350 K was measured. In M-T, it was found that the positive value of T < Td ( Td ≈60 K ) was paramagnetism, and the negative value of T>Td a was diamagnetism. This conclusion was confirmed by testing the M-H variation relationship, providing experimental basis for the diamagnetism of KNbO3 at room temperature. |
| Key words: KNbO3 dielectric properties ferroelectric phase transition magnetic hysteresis loop |
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