K. Kani

preparation and ferroelectric properties of sol-gel-derived (Pb, Ca)TiO3 thin films

Etude des proprietes structurale et ferroelectriques de couches de (Pb 1−x Ca x )TiO 3 (0,0≤x≤0,35) preparees par la methode sol-gel

Sol-gel processing and pyroelectric properties of lanthanum-modified PbTiO3 thin films

Thin films in the system (Pb 1-x La 2x/3 )TiO 3 (0.0≤x≤0.2) were successfully prepared through the sol-gel process. The films fired at 650°C on Pt substrate were uniform and crack-free. Their structural and electrical propertieswere characterized, and D-E hysteresis loops were observed

Preparation of magnesium-substituted LiTaO3 films by the sol-gel method

Des couches minces Li 1-x Mg x/2 TaO 3 (x = 0 a 0,20) avec et sans orientation preferentielle ont ete preparees a partir de solutions alcoxydes.

Preparation and properties of rapidly quenched glasses in the V2O5-CdO system

Rapidly quenched glassy films in the V2O5-PbO system were prepared using a twin-roller type apparatus. The glass formation region was 0–60 mol% PbO. The first crystallization temperature increased from 210 ‡C for the V2O5 glass to 292 ‡C for the glass of 60 mol% PbO. The metastable unknown phase was first crystallized in the glasses around 50 mol% PbO. Infrared absorption spectra of the glasses were measured. Electrical conductivity of the glasses decreased with increasing of PbO content. The electrical behaviour of the glasses is discussed based on the glass structure estimated from the infrared spectral data.

Preparation ofc-plane oriented Pb5Ge3O11 film by the sol-gel method

C-plane oriented Pb 5 Ge 3 O 11 films on platinum plate were successfully prepared by the sol-gel method. The degree of c-plane orientation is useful for pyroelectric devices.

Properties of the glasses prepared by rapid quenching in the V2O5-MO(M=Mg, Ca and Ba) system

Rapidly quenched glasses in the V2O5-MO (M=Mg, Ca and Ba) systems have been prepared by a twin-roller technique. Glasses up to 40 mol% MgO and 50 mol% CaO or BaO were obtained. No metastable phase was observed in the crystallization processes. From the infrared spectral data for the glasses, the structural change of the glasses are discussed. The electrical conductivity of the glasses decreased with increasing MO content, and the electrical behaviour of the glasses has been related to the structural change of the glasses.

High and low temperature polymorphs of cadmium metavanadate CdV2O6

Etude par diffraction RX et analyse thermique differentielle en vue de clarifier la relation entre les deux polymorphes de CdV 2 O 6