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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
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)
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TTd 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
DOI:
基金项目:
Study on the Crystal Structure, High Temperature Dielectric Properties and Magnetic Properties of K1-xCaxNbO3 ceramics
ZHANG Ke1, XING Luyao1, WU Zegnyuan1, LV Shiying1, MA Yimeng2, SU Ju3, SONG Guilin4
(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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