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| 1 | Study of the structural,ferroelectric,dielectric,and pyroelectric properties of the K0.5Na0.5NbO3 system doped with Li+,La3+,and Ti4+显示文摘Pure Ko.sNao sNbO3(KNN)and KNN doped with Lit(6%mole),Lat(1.66%,5%,6%mole),and Ti+t(10%mole)were prepared by mixture of oxides using high-energy milling and conventional solid-state reaction.The effects of the dopant on the physical properties of pure KNN have been evaluated based on the structural,ferroelectric,pyroelectric,and dielectric measurements.The XRD measurements show that KNN pure sample contains a mixture of monoclinic and orthorhombic crystalline phases,with a slightly higher concentration of monoclinic phase.In contrast,all doped samples show a higher concentration of the orthorhombic phase,as well as the presence of a secondary phase(K6Nb10.8O3o),also detected by Raman measurements.The samples with a higher concentration of this secondary phase,also present greater dielectric losses and lower values of remnant polarization.The dielectric measurements allowed us to detect temperatures of structural transitions(orthorhombic-tetragonal,O-T)previous to the ferroelectric paraelectric transition(tetragonal-cubic,T-C),and also in this set of samples,a direct correlation was found between the values of remnant polarization and the corresponding pyroelectric signal response. | C.MONTERO-TAVERA M.D.DURRUTHY-RODRiGUEZ F.D.CORTES-VEGA J.M.YANEZ-LIMON | 2020 | Journal of Advanced Ceramics2020，9，3： | 2 |
| 2 | (K_(0.5)Na_(0.5))NbO_(3)-xBi(Co_(0.875)Fe_(0.125))O_(3)多铁陶瓷的相变及其铁电性和铁磁性显示文摘采用固相反应烧结法合成了(K_(0.5)Na_(0.5))NbO_(3)-xBi(Co_(0.875)Fe_(0.125))O_(3)(KNN-xBCF)多铁陶瓷,并且对其结构和光电磁等特性进行了系统的研究。结果表明,随着BCF组分x的增加,KNN-xBCF陶瓷表现出明显的由正交相向菱形相的结构转变行为,而且其光学带隙也被降低到了3 eV。此外,源于正交相和菱形相的共存,KNN-0.01BCF陶瓷拥有最大的剩余极化强度,约为4.02μC/cm^(2)。同时,KNN-xBCF陶瓷的磁性可以由抗磁性转化为铁磁性,从而实现铁电性与铁磁性的共存。系统研究了无铅钙钛矿多铁KNN-xBCF陶瓷的结构相变、带隙窄化、铁电性和铁磁性,并且展示了其在多铁器件中的潜在应用。 | 张超 郑东亮 陶加华 杨平雄 褚君浩 | 2021 | 微纳电子技术2021，58，8： | 0 |
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