Acoustic Properties of Lanthanum-Samarium Phosphate Glasses
From measurements of changes in transit time of 10 MHz of ultrasonic waves as a function of temperature and hydrostatic pressure, the acoustic properties of (La203)x(Sm203)y(P20,,) (l-x-y) glasses with compositions near to that corresponding to the metaphosphate have been determined. For each glass,...
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Universiti Putra Malaysia Press
1995
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my.upm.eprints.38152013-05-27T07:11:28Z http://psasir.upm.edu.my/id/eprint/3815/ Acoustic Properties of Lanthanum-Samarium Phosphate Glasses Hassan, Senin Abd. Aziz, Sidek G. A., Saunders From measurements of changes in transit time of 10 MHz of ultrasonic waves as a function of temperature and hydrostatic pressure, the acoustic properties of (La203)x(Sm203)y(P20,,) (l-x-y) glasses with compositions near to that corresponding to the metaphosphate have been determined. For each glass, the second order elastic stiffness tensor components Cij ' (SOEC) continue to increase down to 10 Kin a manner consistent with phonon interactions with tVi'Qlevel systems. Measurements of the effects of hydrostatic pressure on the ultrasonic wave velocities have been used to determine the hydrostatic pressure derivatives (dCij/dP) T,P=O of the SOEC and (dBo'/ dP) T,P=O of the bulk modulus Bo at room temperature (293K). For these glasses, (dCll/dP), (dC44/dP), and (dBo / dP), are small but positive; the corresponding glasses stiffen under pressure. The elastic behaviour under pressure of these glasses lies intermediate between those of (Sm203)y(P20,,),(I_x) and (La20:1)y(P20,,) (I-x) glasses. Replacement of La3+ by Sm3+ in the temary phosphate glasses drives a slight acoustic mode softening. Possible. sources of the different effect of La:>+ and Sm3+ modifiers on the nonlinear acoustic properties of metaphosphate glasses are discussed. Universiti Putra Malaysia Press 1995 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/3815/1/Acoustic_Properties_of_Lanthanum-Samarium.pdf Hassan, Senin and Abd. Aziz, Sidek and G. A., Saunders (1995) Acoustic Properties of Lanthanum-Samarium Phosphate Glasses. Pertanika Journal of Science & Technology, 3 (1). pp. 187-195. ISSN 0128-7680 English |
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Universiti Putra Malaysia |
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| language |
English English |
| description |
From measurements of changes in transit time of 10 MHz of ultrasonic waves as a function of temperature and hydrostatic pressure, the acoustic properties of (La203)x(Sm203)y(P20,,) (l-x-y) glasses with compositions near to that corresponding to the metaphosphate have been determined. For each glass, the second order elastic stiffness tensor components Cij ' (SOEC) continue to
increase down to 10 Kin a manner consistent with phonon interactions with tVi'Qlevel systems. Measurements of the effects of hydrostatic pressure on the ultrasonic wave velocities have been used to determine the hydrostatic pressure derivatives (dCij/dP) T,P=O of the SOEC and (dBo'/ dP) T,P=O of the bulk modulus Bo at room temperature (293K). For these glasses, (dCll/dP), (dC44/dP), and
(dBo / dP), are small but positive; the corresponding glasses stiffen under pressure. The elastic behaviour under pressure of these glasses lies intermediate between those of (Sm203)y(P20,,),(I_x) and (La20:1)y(P20,,) (I-x) glasses.
Replacement of La3+ by Sm3+ in the temary phosphate glasses drives a slight acoustic mode softening. Possible. sources of the different effect of La:>+ and Sm3+ modifiers on the nonlinear acoustic properties of metaphosphate glasses
are discussed. |
| format |
Article |
| author |
Hassan, Senin Abd. Aziz, Sidek G. A., Saunders |
| spellingShingle |
Hassan, Senin Abd. Aziz, Sidek G. A., Saunders Acoustic Properties of Lanthanum-Samarium Phosphate Glasses |
| author_facet |
Hassan, Senin Abd. Aziz, Sidek G. A., Saunders |
| author_sort |
Hassan, Senin |
| title |
Acoustic Properties of Lanthanum-Samarium Phosphate Glasses |
| title_short |
Acoustic Properties of Lanthanum-Samarium Phosphate Glasses |
| title_full |
Acoustic Properties of Lanthanum-Samarium Phosphate Glasses |
| title_fullStr |
Acoustic Properties of Lanthanum-Samarium Phosphate Glasses |
| title_full_unstemmed |
Acoustic Properties of Lanthanum-Samarium Phosphate Glasses |
| title_sort |
acoustic properties of lanthanum-samarium phosphate glasses |
| publisher |
Universiti Putra Malaysia Press |
| publishDate |
1995 |
| url |
http://psasir.upm.edu.my/id/eprint/3815/1/Acoustic_Properties_of_Lanthanum-Samarium.pdf http://psasir.upm.edu.my/id/eprint/3815/ |
| _version_ |
1643822721768882176 |
| score |
13.251813 |