Electrical characterization by impedance spectroscopy of Zn7Sb2O12 ceramic

Abstract

Impedance spectroscopy technique was used to investigate the electric properties of Zn7Sb2O12, an electroceramic with inverse spinel type structure. The electric characterization of the Zn7Sb2O12 semiconducting ceramic was performed at temperature from 250 to 550 &deg;C, in the frequency range from 5 Hz to 13 MHz. Zinc antimoniate phase was synthesized by the polymeric precursors method. The bulk resistance curve as a function of temperature exhibits a thermistor behavior with negative temperature coefficient. The bulk conductivity follows the Arrhenius law with two linear branches of different slopes positioned at around a region of transition, 450 &deg;C > T > 350 &deg;C. The activation energy values at low temperature (< 350 &deg;C) and high temperature (> 450 &deg;C) are equals to 0.78 and 0.61 eV, respectively. The existence of a phase transition limiting these regions is discussed

Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics

“…1,2 The effects of the grainboundary phenomenon in spinels have recently led to investigations on possible classic technological applications. 2,3 The use of Zn 2 SnO 4 as an anode material for Li-ion batteries, 4 together with research on its use in semiconductor working electrodes for dye-sensitized solar cells, 5,6 make it a suitable subject for further study.…”

Evidence of a Thermal Diffusivity Gap in Sintered Li–Co–Sb–O Solid Solutions

“…Ceramic oxides with spinel structures are a class of versatile materials that possess outstanding physical properties that make them useful in the design and operation of a wide variety of technological applications. For example, these materials have been used as diluted magnetic semiconductors (DMS), − catalysts, , thermistors, and pigments, among others. , Spinel compounds with pentavalent (Zn 7 Sb 2 O 12 ) and divalent (Co 7 Sb 2 O 12 ) cations have shown high potential as ceramic varistors . In particular, the binary spinel Co 7 Sb 2 O 12 has attracted interest, since the ion distribution of Co 2+ in the tetrahedral and octahedral sites into the spinel structure can be affected by the high valence of the Sb 5+ ion and high sintering temperatures. , Physical properties of spinel oxides depend on the cation distribution through the tetrahedral and octahedral sites in the structure, as Co 2+ ions occupy both sites but have a preference for octahedral sites and Sb 5+ is restricted to octahedral sites; when Li is added to Co 7 Sb 2 O 12 , a new solid solution is obtained and the cation distribution changes, consequently modifying the physical properties.…”

“…Ceramic oxides with spinel structures are a class of versatile materials that possess outstanding physical properties that make them useful in the design and operation of a wide variety of technological applications. For example, these materials have been used as diluted magnetic semiconductors (DMS), 1−3 catalysts, 4,5 thermistors, 6 and pigments, 7 among others. 8,9 Spinel compounds with pentavalent (Zn 7 Sb 2 O 12 ) and divalent (Co 7 Sb 2 O 12 ) cations have shown high potential as ceramic varistors.…”