G. Said
Cairo University
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Featured researches published by G. Said.
Applied Physics A | 1987
F. El-Kabbany; Y. Badr; G. Said; S. Taha
The dielectric constant, dc resistance, D-E ferroelectric hysteresis loop and dilatometric analysis of the three phases I, II, and III of AgNO3 single crystals has been studied over the temperature range 100–200° C. A ferroelectric behaviour of the metastable phase III was detected here for the first time similar to what happened in KNO3. The ferroelectric is attributed here to Ag+-ion vacancy formation in the unit cell of AgNO3. The energy activating the process of vacancy formation was found to beEv=2.6 eV. It was found that an ionic shift from one lattice point to another requires an amount of energy to overcome a potential barrierEm=0.1 eV. A model is suggested to explain such behaviour. Dilatometric analysis indicated that this metastable phase transition I→II is accompanied by an expansion of the unit cell.
Physica Status Solidi (a) | 1986
F. El-Kabbany; Y. Badr; G. Said; S. Taha; Salah Mahrous
Physica Status Solidi (a) | 1986
F. El-Kabbany; G. Said; S. Mahbous; S. Taha
Physica Status Solidi (a) | 1983
A. R. Ali; G. Said
Physica Status Solidi (a) | 1987
F. El-Kabbany; G. Said; Salah Mahrous; N. H. Taher
Physica Status Solidi (a) | 1981
F. El-Kabbany; G. Said; Y. Badr; S. Taha
Physica Status Solidi (a) | 1981
F. El-Kabbany; Y. Badr; G. Said
Physica Status Solidi (a) | 1984
A. R. Ali; S. A. Mahmoud; G. Said
Physica Status Solidi (a) | 1980
Y. Badr; F. El-Kabbany; G. Said; O. W. Saleh
Annalen der Physik | 1987
F. El-Kabbany; Y. Badr; G. Said; S. Taha; Salah Mahrous
