Wyniki wyszukiwania - BazTech

1

The effect of preannealing conditions on the crystallization behaviour of amorphous Co78Si11B11alloy.

Dróżdż D., Kulik T.

Inżynieria Materiałowa

|

2001

|

R. XXII, nr 4

283-285

EN

The structural changes of amorphous Co78Si11B11 obtained by rapid quenching and then subjected to annealing, were examined by X-ray diffractometry and transmission electron microscopy. When comparing the structures of the alloy characterized by a similar volume fraction of the crystalline phase, it was found that the size of crystals depends strongly on the preannealing temperature and time. The decrease of the preannealing temperature by 90K, resulted in a formation of epsilon-Co phase with the crystals almost five times longer then the crystals obtained at a higher temperature. The calculated lattice parameters of the hexagonal crystals in partially crystallized alloy are also dependent on the preannealing temperature Ta.

PL

Amorficzny stop Co78Si11B11 otrzymany metodą szybkiego chłodzenia ze stanu ciekłego, wygrzewano a następnie zbadano stosując dyfrakcję promieni rentgenowskich i transmisyjną mikroskopię elektronową. Porównując struktury stopu o podobnym stopniu skrystalizowania, zauważono silną zależność wielkości powstałych kryształów od temperatury i czasu wygrzewania. Obniżenie temperatury wygrzewania o 90K spowodowało pojawienie się w strukturze pięciokrotnie dłuższych kryształów heksagonalnej fazy epsilon-Co w stosunku do kryształów obserwowanych po wygrzewaniu w wyższej temperaturze. Wartość parametrów sieci otrzymanej fazy epsilon-Co w częściowo skrystalizowanym stopie również zależy od temperatury wygrzewania Ta.

2

Humidity sensor based on porous glass-ceramic.

Nocuń M., Bugajski W.

Optica Applicata

|

2000

|

Vol. 30, nr 4

613-618

EN

The microstructure and phase composition of a lithium titanium phosphate glass-ceramic was studied. The porous material with open porosity was obtained as a result of thermal treatment. The main crystalline phase detected was lithium titanium phosphate (LiTi/sub 2/(PO/sub 4/)/sub 3/). Particles of the crystalline phase are very uniform in shape, with mean diameter of 2 mu m and the size of pores ~0.5 mu m. It has been shown that such a glass-ceramic material can be utilised as a humidity sensor. The sensor under study works reversibly and is linear in the humidity range 6-95% RH.

3

Electric properties of phosphate glasses.

Nocuń M., Bugajski W.

Optica Applicata

|

2000

|

Vol. 30, nr 4

719-725

EN

The results of DC conductivity studies of glasses and glass-ceramics from Li/sub 2/O-P/sub 2/O/sub 2/-SiO/sub 2/-TiO/sub 2/-Al/sub 3/O/sub 3/ system are presented. The main crystalline phase in devitrificates is lithium titanium phosphate (LiTi/sub 2/(PO/sub 4/)/sub 3/) but the phase composition strongly depends on the chemical composition of the glass. The activation energy of the conduction process is very low being characteristic of superionic conductors and equals ~0.25 eV. The DC conductivity at room temperature is about 1*10/sup -6/ Scm/sup -1/. The highest conductivity has been observed for glasses containing 2.5 wt% Al/sub 2/O/sub 3/.