Effect of Tb-doped Concentration Variation on the Electrical and Dielectric Properties of CaF₂ Nanoparticles

Calcium fluoride (CaF₂) nanoparticles with various terbium (Tb) doping concentrations were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and alternating current (AC) impedance measurement. The original shape and structure of CaF₂ nanoparticles were retained after d...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2018-07, Vol.8 (7), p.532
Main Authors: Cui, Xiaoyan, Hu, Tingjing, Wang, Jingshu, Zhong, Xin, Chen, Yinzhu, Zhang, Junkai, Li, Xuefei, Yang, Jinghai, Gao, Chunxiao
Format: Article
Language:English
Subjects:
Alternating current
Calcium
Calcium fluoride
Calcium ions
Crystal defects
Current carriers
Deformation
dielectric behavior
Dielectric properties
Disease transmission
Doping
Electrical properties
Energy consumption
Fluorides
Grain boundaries
Impedance measurement
Ion diffusion
Laboratories
Light emitting diodes
Nanocrystals
Nanoparticles
Optics
Phase transitions
Terbium
Transmission electron microscopy
transport process
Transportation
X-ray diffraction
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Summary:Calcium fluoride (CaF₂) nanoparticles with various terbium (Tb) doping concentrations were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and alternating current (AC) impedance measurement. The original shape and structure of CaF₂ nanoparticles were retained after doping. In all the samples, the dominant charge carriers were electrons, and the F ion transference number increased with increasing Tb concentration. The defects in the grain region considerably contributed to the electron transportation process. When the Tb concentration was less than 3%, the effect of the ionic radius variation dominated and led to the diffusion of the F ions and facilitated electron transportation. When the Tb concentration was greater than 3%, the increasing deformation potential scattering dominated, impeding F ion diffusion and electron transportation. The substitution of Ca by Tb enables the electron and ion hopping in CaF₂ nanocrystals, resulting in increased permittivity.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano8070532