Abstract
The electric and dielectric properties of SrF2:Tb3+ nanocrystals were studied by AC impedance spectroscopy. The grain and grain boundary resistances and the complex permittivity with different Tb-doped concentrations were obtained. As the Tb-doping concentration increases, the grain and grain boundary resistances decrease until 6% and then increase. The Tb doping leads to the increase of interstitial F− quantity and the decrease of the activation enthalpy, and finally causes the decreases of grain and grain boundary resistances. When the Tb-doping is larger than 6%, the effect of the deformation potential scattering is dominant, which leads to the increases of grain and grain boundary resistances. The strong dispersion of the permittivity at the low frequencies indicates the carrier was hopping in the transport process. The ε′ and ε″ values at the low frequencies decrease as the sample resistance increases.
Highlights
Nanomaterials attract particular interest due to their unique physical and chemical properties [1,2,3,4,5,6,7,8].It is well known that the unique properties are mainly from their grain boundary and interface.The study on the grain boundary and interface properties of nanomaterials is very important.AC impedance spectroscopy is a powerful method which can give out the transport property of grain and grain boundary individually [9,10,11]
Many studies had modulated the electric and dielectric properties SrF2 through the rare earth doping [13,14,15,16]
The SrF2 :Tb3+ nanocrystals were studied by XRD, EDS, TEM and AC impedance spectroscopy
Summary
Nanomaterials attract particular interest due to their unique physical and chemical properties [1,2,3,4,5,6,7,8].It is well known that the unique properties are mainly from their grain boundary and interface.The study on the grain boundary and interface properties of nanomaterials is very important.AC impedance spectroscopy is a powerful method which can give out the transport property of grain and grain boundary individually [9,10,11]. It is well known that the unique properties are mainly from their grain boundary and interface. The study on the grain boundary and interface properties of nanomaterials is very important. SrF2 is a potential material used as the electrolyte of solid batteries [12]; how to improve its carrier conduction is an attractive and necessary subject. Many studies had modulated the electric and dielectric properties SrF2 through the rare earth doping [13,14,15,16]. Réau et al studied the electrical properties of rare earth doped SrF2 polycrystalline and found that the conductivity of the sample firstly increases with the doping concentration increasing and decreases [16]. Synthesis of the nanoscale sample is an effective method used to improve the material carrier conduction
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