Abstract Concerning to the exuberant applications in the field of electrical and dielectric materials, group IV elements lie at the heart of many electronic devices and received significant attention owing to its chemical stability and high oxygen affinity. Among that Ni-Co ferrite especially delivers multi-applications. Present work reports the facile synthesis of Ni-Co ferrite with the substitution of rare earth lanthanum metal for the investigation of electric and dielectric behaviour through a structural, morphological point of view. Several analytical techniques subsequently evaluated the effect of lanthanum on the structural, physical-chemical, morphological, thermal and overall properties of Ni-Co ferrites. The results indicated that the crystalline size of Ni-Co ferrite synthesized by sol–gel auto combustion method gradually decreased with the Lanthanum composition increased in composites. Additionally, the lattice constant, bulk density and porosity of the composite materials investigated. Substitution of lanthanum has a strong influence on electric and dielectric behaviour of the Ni-Co ferrite composites results into increment in the electrical conductivity of Ni-Co-La ferrite composites. On the other hand, the dielectric constant and dielectric loss decreased with the increase in frequency. Overall incorporation of lanthanum ensured the improvement in the electric and dielectric behaviors of Ni-Co ferrites.

中文翻译：

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用于分析电和介电性能的结构工程镧取代镍钴铁氧体的制备和表征

摘要 IV族元素在电学和介电材料领域有着广泛的应用，是许多电子器件的核心，因其化学稳定性和高氧亲和力而受到广泛关注。其中镍钴铁氧体尤其适用于多种应用。目前的工作报告了用稀土镧金属替代镍钴铁氧体的简便合成，用于通过结构、形态学的角度研究电和介电行为。随后，几种分析技术评估了镧对 Ni-Co 铁氧体的结构、物理化学、形态、热和整体性能的影响。结果表明，随着复合材料中镧成分的增加，溶胶-凝胶自燃法合成的Ni-Co铁氧体的晶粒尺寸逐渐减小。此外，还研究了复合材料的晶格常数、堆积密度和孔隙率。镧的取代对Ni-Co-La铁氧体复合材料的电和介电行为有很大影响，导致Ni-Co-La铁氧体复合材料的电导率增加。另一方面，介电常数和介电损耗随着频率的增加而降低。镧的整体掺入确保了 Ni-Co 铁氧体的电学和介电行为的改善。研究了复合材料的堆积密度和孔隙率。镧的取代对Ni-Co-La铁氧体复合材料的电和介电行为有很大影响，导致Ni-Co-La铁氧体复合材料的电导率增加。另一方面，介电常数和介电损耗随着频率的增加而降低。镧的整体掺入确保了 Ni-Co 铁氧体的电学和介电行为的改善。研究了复合材料的堆积密度和孔隙率。镧的取代对Ni-Co-La铁氧体复合材料的电和介电行为有很大影响，导致Ni-Co-La铁氧体复合材料的电导率增加。另一方面，介电常数和介电损耗随着频率的增加而降低。镧的整体掺入确保了 Ni-Co 铁氧体的电学和介电行为的改善。