Abstract
The electrical conduction phenomena, dielectric response and microstructure have been discussed in sintered silicon nitride ceramics at different temperature and frequencies. Microstructure and phase of the sintered samples was investigated by Scanning Electron Microscope (SEM) and X-ray diffractometer (XRD). The electrical conductivity, dielectric constant and dielectric loss increases exponentially with temperature greater than 600 K. The dielectric constant and loss have been measured in the frequency range 100 Hz to 1 MHz. The a.c. conduction studies in the audio frequency range 500 Hz to 1 MHz indicates that the conduction may be due to the electronic hopping mechanism. Silicon Nitride ceramics became dense after sintering. The effect of grain size and role of phase on electrical and dielectric properties have been discussed. These types of samples can be used as a high temperature semi conducting materials for device packaging.
Highlights
Silicon nitride-based ceramics have many excellent properties, high strength and relatively high fracture toughness, good wear resistance, good oxidation resistance and good corrosion resistance
The effect of grain size and role of phase on electrical and dielectric properties have been discussed. These types of samples can be used as a high temperature semi conducting materials for device packaging
We have discussed the electrical conductivity of Silicon Nitride Ceramic (Si3N4) ceramics in the temperature range (300 K to 1000 K)
Summary
Silicon nitride-based ceramics have many excellent properties, high strength and relatively high fracture toughness, good wear resistance, good oxidation resistance and good corrosion resistance For some time, they have been under consideration as high-performance structural materials because of their superior thermal shock resistance relative to oxide ceramics [1]. Low-density porous silicon nitride [6,7,8,9,10,11,12] ceramic is an important material with properties including low dielectric constant ( = 2.5 to 8, tan δ ≤ 3 × 10–3), good mechanical, high resistance to rain erosion and sand erosion. Throp [19,20] reveal the kinetics of densification, mechanical, electrical and thermal properties of Si3N4 has been studied No such systematic effort had been made on the electrical conductivity and dielectric properties of silicon nitride ceramic
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