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Featured researches published by G. Said.


Applied Physics A | 1987

Ferroelectricity associated with the metastable phase III of AgNO3

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

A study of the thermal hysteresis in AgNO3

F. El-Kabbany; Y. Badr; G. Said; S. Taha; Salah Mahrous


Physica Status Solidi (a) | 1986

Comparative electrical study of thermal hysteresis in KNO3, AgNo3, and NaNo3

F. El-Kabbany; G. Said; S. Mahbous; S. Taha


Physica Status Solidi (a) | 1983

On the recovery and annealing kinetics of cold-worked Ni–4.5 at% Cu alloy

A. R. Ali; G. Said


Physica Status Solidi (a) | 1987

Thermal hysteresis in isomorphic divalent ionic nitrates Ba(NO3)2, Pb(NO3)2, and Sr(NO3)2

F. El-Kabbany; G. Said; Salah Mahrous; N. H. Taher


Physica Status Solidi (a) | 1981

Infrared investigation of the phase transition in K2SO4

F. El-Kabbany; G. Said; Y. Badr; S. Taha


Physica Status Solidi (a) | 1981

Pyroelectric and dielectric behaviour of ammonium nitrate at the phase transition II–I

F. El-Kabbany; Y. Badr; G. Said


Physica Status Solidi (a) | 1984

On the role of Cu atoms on the behaviour of domain wall-dislocation interaction in NiCu alloy

A. R. Ali; S. A. Mahmoud; G. Said


Physica Status Solidi (a) | 1980

Effect of the internal motion of NH 4+ on the properties of some halides

Y. Badr; F. El-Kabbany; G. Said; O. W. Saleh


Annalen der Physik | 1987

A Study of the Thermal Hysteresis in AgNO3

F. El-Kabbany; Y. Badr; G. Said; S. Taha; Salah Mahrous

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