Abstract
The behavior of variation of dielectric constant with temperature of solid solution of Cadmium Acetate Cd(C2H3O2)2 with Aluminium (III) Oxide Al2O3 and other dielectric parameters have been measured between the temperatures 35°C to 100°C using the capacitance bridge model ZENITH-FM89A and Q meter at the frequency of 2000 Hz. In the measurement, it have been observed that the compound has lower value of dielectric constant (ε = 1580) below 36ºC, which rises upto a value of 5600 at the moderate temperature of 45ºC. After this temperature, the dielectric constant of compound decreases upto the value of nearly 3521 at the temperature of 75ºC and a high peak at the temperature of 76°C (ε = 7000) in the heating cycle curve with some fluctuations.. When the variation of dielectric constant was studied in cooling cycle the peak was observed at 62ºC(ε = 6500), above and below this temperature dielectric constant decreases with some intermediate fluctuations and by increasing aluminium oxide content in the mother compound, its quality factor also increases with a little effect on dielectric constant. The cooling cycle curve does not follow heating curve because of the relaxor behaviour of the compound. The results have been explained on the basis of crystal structure changes and the possibility of free internal rotation of acetate groups within the crystal lattice at elevated temperature. One of the advantages of Cd(C2H3O2)2 with Al2O3 is that by varying the Aluminium Oxide content, one can control temperature coefficient of resonant frequency τf without affecting the other properties. This is important for many ferroelectric applications because τf of near about low value is not always required. A non-zero τf is often preferable to compensate for frequency variation due to the effect of temperature change on the resonator housing and dielectric support structure. Solid solution of Cadmium Acetate with Aluminium Oxide suggests for its valuable applications as dielectric material with excellent properties useful in ceramics engineering and communication system. KEY WORDS: Polarization, Quality Factor, Dielectric Constant, Phase Transition, Curie temperature, Resonant Frequency and Ceramics Engineering.
Highlights
The dielectric constant is a solid state property which is technically important and is helpful in understanding basic crystal physics
Measurement of dielectric constant and loss as a function of frequency and temperature helps in understanding the polarization mechanism, process of conduction, influence of impurities and phase transition
The nature of dielectric constant with the variation of temperature of solid solution of Cadmium Acetate Cd(C2H3O2)2 and Aluminium (III) Oxide Al2O3 and other dielectric parameters have been measured between the temperatures 35°C to 100°C using the capacitance bridge model ZENITH-FM89A and Q meter at the frequency of 2000 Hz in which percentage of Al2O3 is from 20 to 35
Summary
The dielectric constant is a solid state property which is technically important and is helpful in understanding basic crystal physics. Measurement of dielectric constant and loss as a function of frequency and temperature helps in understanding the polarization mechanism, process of conduction, influence of impurities and phase transition. Polarization is the result of ordering of the electrically charged particles under the action of external field It shows up as an increase in the capacitance of a condenser in the presence of a dielectric. The polishing of the pellets has been done to obtain smooth parallel surface to be used for electrode formation polishing of the crystal introduces electrical charges inside the material These charges and strains are to be removed, which we did by the process of annealing of the sample. These parameters have to be measured in the presence and absence of the test sample, for other techniques only once in the presence of the test sample[8]
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