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High Performance of Electroacoustic Piezoelectric Ceramic Transducers

100%
Abd El-Ati M., Mosaad M., El-Baradie B.
Acta Physica Polonica A
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1992
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vol. 81
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issue 4-5
527-533
EN
Lead zirconate-titanate containing 1 wt % niobium with different Zr/Ti ratios compositions were studied. A pronounced increase in densification during sintering process occurred near tetragonal-rhombohedral phase. Dielectric constant of polarized and unpolarized samples was studied. The rotation of all 90° domains to their original positions caused the more looseness of Ti^{4+} and Zr^{4+} in the octahedral configuration leading to greater polarization in the tetragonal structure, thus leading to, higher dielectric constant. Near the phase change, the minimum resonance frequency caused the minimum values of ultrasonic waves, which were emitted from the edge of the polarized ceramic transducers.
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Electrical and Thermal Conductivities of Some Sulphate Compounds

88%
Abdel-Kader M., Mosaad M., Olofa S., Abdel-Ati M., El-Shawarby A.
Acta Physica Polonica A
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1993
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vol. 83
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issue 2
187-194
EN
The electrical conductivity σ and the thermal conductivity λ were investigated at varying temperature (40 < T < 120°C) for two sulphate compounds, anhydrous mercury(II) sulphate HgSO_{4} and cerous(III) sulphate Ce_{2}(SO_{4})_{3}·H_{2}O. It seems likely that each of the two sulphate salts undergoes structural phase transition around 90°C. The differential thermal analysis thermogram was carried out as an aid for confirming of the observed phase transitions. The mechanism of the heat transfer is mainly due to phonons. Interpretation of the obtained data was given on the basis of the reorientational motion of the SO_{4}‾ ‾ ions.
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