Wszystkie pola: Gaafar, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Structural Analysis of Some Alkali Diborate Glasses
Autorzy:: Saddeek, Y.
Gaafar, M.
Abd El-Aal, N.
Abd El-Latif, L.
Powiązania:: https://bibliotekanauki.pl/articles/1807784.pdf
Data publikacji:: 2009-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Fs
62.30.+d
65.60.+a
Opis:: This manuscript presents a theoretical analysis of the correlation between the computed bulk modulus and the structure of a series of multicomponent sodium diborate based glasses in terms of the bond compression model. The main parameters in the analysis were the computed elastic moduli, the average stretching force constant and the average atomic ring size. These parameters were calculated for every glass series and for every glass composition. The results showed that the average force constant and the elastic moduli of these glasses are sensitive to the decrease in the sodium diborate content. This behaviour was attributed to the increase in the molar volume, and to the role of the different modifiers.
Źródło:: Acta Physica Polonica A; 2009, 116, 2; 211-216
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Effect of Doping by Different Transition Metals on the Acoustical Properties of Alkali Borate Glasses
Autorzy:: Gaafar, M.
El-Batal, F.
El-Gazery, M.
Mansour, S.
Powiązania:: https://bibliotekanauki.pl/articles/1808106.pdf
Data publikacji:: 2009-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Fs
43.35.Ae
62.20.Dc
65.40.De
Opis:: Longitudinal and shear ultrasonic wave velocities were measured in binary $Li_2O-2B_2O_3$ glasses doped with different transition metal oxides (TMOs) (where TMO = $V_2O_5$, $Fe_2O_3$, $Cr_2O_3$, NiO, $TiO_2$, $MnO_2$ and CuO) using pulse echo technique. Measurements were carried out at 4 MHz frequency and at room temperature. Elastic moduli and some other physical parameters such as acoustic impedance, Debye temperature, thermal expansion coefficient, and latent heat of melting were calculated. Results indicated that these parameters depend upon the TMO modifier i.e., the ionic radius of the transition metal cation. Quantitative analysis has been carried out, in order to obtain more information about the structure of these glasses, based on bond compression model, and the Makishima and Mackenzie model, i.e., the cation-anion bond of each TMO.
Źródło:: Acta Physica Polonica A; 2009, 115, 3; 671-678
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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