Wyniki wyszukiwania - BazTech

1

Monokryształy antymonku galu (GaSb) otrzymane metodą Czochralskiego

Mirowska A., Orłowski W., Bańkowska A.

Elektronika : konstrukcje, technologie, zastosowania

|

2010

|

Vol. 51, nr 1

53-55

PL

Do otrzymywania monokryształów antymonku galu (GaSb) została wybrana metoda Czochralskiego. Zbadano wpływ parametrów technologicznych procesu na właściwości niedomieszkowanych monokryształów GaSb. Otrzymano niedomieszkowane monokryształy o orientacji <111> oraz <100> o koncentracji nośników p< 2·10¹⁷ cm⁻³ oraz ruchliwości u > 600 cm²/Vs mierzonej w 300K. Przeprowadzono próby domieszkowania antymonku galu na typ n przewodnictwa (domieszkowanie tellurem) oraz na typ p przewodnictwa (jako domieszki użyto krzem). W obu przypadkach otrzymano monokryształy o orientacji <100>.

EN

Gallium antimonide (GaSb) single crystals were grown by Czochralski method. The influence of technological parameters on GaSb parameters has been investigated. Undoped <111> and <100> oriented GaSb single crystals were obtained with carrier concentration p < 2·10¹⁷ cm⁻³ and mobility μ > 600 cm²/Vs (measured in 300K). Gallium antimonide doping were done for n-type of conductivity (by tellurium) and for p-type (by silicon). In both cases <100> oriented single crystals were obtained.

2

Krystalizacja nadpowierzchniowa i zjawiska transportowe towarzyszące korozji szkła krzemianowego sodowo-wapniowego.

Stoch L., Greiner-Wrona E., Ciecińska M., Wacławska I., Trybalska B., Środa M.

Szkło i Ceramika

|

1999

|

R. 50, nr 3

2-6

3

'Package' morphology of the Al-3.5Li alloy solidified directionally in microgravity condition.

Wołczyński W., Nguyen-Thi H., Kloch J., Major B., Wyrzykowski J.W.

Inżynieria Materiałowa

|

1998

|

R. XIX, nr 3

612-615

EN

The so-called package morphology has been revealed in the Al-3.5Li alloy solidified directionally during microgravity test. The s/l interface has been quenched during the experiment. The 1D observation of longitudinal section of the s/l interface of the package morphology revealed doublets. The result of 1D experiment leading to doublets formation in terrestial conditions has been compared with 1D structure obtained from the microgravity test. A mathematical description of the s/l interface of doublets has been worked out. The package morphology is treated as a result of the interplay among the waves of perturbation which can appear on the plane surface of a single crystal growing in the microgravity conditions. The physical interpretation of proposed equations is given.

4

Contribution of the back-diffusion phenomenon to microsegregation of solute for dendritic and cellular growth.

Wołczyńska W., Kloch J.

Inżynieria Materiałowa

|

1998

|

R. XIX, nr 3

532-535

EN

New method for the estimation of solute redistribution in dendritic and cellular growth after back diffusion is developed. The redistribution depends on partition ratio kappa and back-diffusion parameter alpha known in Brody-Flemings theory. A definition for the redistribution coefficient beta is worked out. It enables to satisfy the mass balance at each stage of cellular or dendritic growth. The redistribution coefficient beta operates to increase the value of partition ratio kappa. The model is reducible to both Scheil approach and equilibrium solidification (lever rule). Physical justification for the back-diffusion parameter alpha is given. A modification of the definition for back-diffusion parameter is proposed to apply it to experimental measurements.