The Effect of MnO2 Content and Sintering Atmosphere on The Electrical Properties of Iron Titanium Oxide NTC Thermistors using Yarosite

International Seminar on Mathematics, Science, and Computer Science Education 2016

数学;自然科学;计算机科学

Wiendartun^1 ; Syarif, Dani Gustaman^2

Departmen Pendidikan Fisika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung

40514, Indonesia^1

PSTNT-BATAN, Jl Tamansari 71, Bandung, Indonesia^2

关键词: Activation energies (Ea);    Electrical characteristic;    Electrical characterization;    Homogeneous mixtures;    Iron titanium oxides;    Room temperature resistance;    Sintering atmospheres;    Thermal coefficients;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/812/1/012120/pdf
DOI  :  10.1088/1742-6596/812/1/012120

来源: IOP

【 摘 要 】

The effect of MnO2content and sintering atmosphere on the characteristics of Fe2TiO5ceramics for Negative Thermal Coefficient (NTC) thermistors by using Fe2O3derived from yarosite has been studied. The ceramics were produced by pressing a homogeneous mixture of Fe2O3, TiO2and MnO2(0-2.0 w/o) powders in appropriate proportions to produce Fe2TiO5based ceramics and sintering the pressed powder at 1100-1200°C for 3 hours in air, O2and N2gas. Electrical characterization was done by measuring electrical resistivity of the sintered ceramics at various temperatures from 30°C to 200°C. Microstructure and structural analyses were also carried out by using an scanning electron microscope (SEM) and x-ray diffraction (XRD). The XRD data showed that the pellets crystallize in orthorhombic. The presence of second phase could not be identified from the XRD analyses. The SEM images showed that the grain size of pellet ceramics increase with increasing of MnO2addition, and the grains size of the ceramic sintered in oxygen gas is smaller than sintered in nitrogen gas. Electrical data showed that the value of room temperature resistance (RRT) tend to decrease with respect to the increasing of MnO2addition and the pellet ceramics sintered in oxygen gas had the largest thermistor constant (B), activation energy (Ea), sensitivity (α) and room temperature resistance (RRT), compared to the sintered in nitrogen gas. From the electrical characteristics data, it was known that the electrical characteristics of the Fe2TiO5pellet ceramics followed the NTC characteristic. The fabricated Fe2TiO5ceramics have thermistor constants (B = 2207-7145K). This can be applied as temperature sensor, and will fulfill the market requirement.