Acoustic Properties of Lanthanum-Samarium Phosphate Glasses

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

[img] PDF


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.

Item Type:Article
Publisher:Universiti Putra Malaysia Press
ID Code:3815
Deposited By: Farhana Yusof
Deposited On:02 Dec 2009 00:44
Last Modified:27 May 2013 07:11

Repository Staff Only: Edit item detail

Document Download Statistics

This item has been downloaded for since 02 Dec 2009 00:44.

View statistics for "Acoustic Properties of Lanthanum-Samarium Phosphate Glasses"

Universiti Putra Malaysia Institutional Repository

Universiti Putra Malaysia Institutional Repository is an on-line digital archive that serves as a central collection and storage of scientific information and research at the Universiti Putra Malaysia.

Currently, the collections deposited in the IR consists of Master and PhD theses, Master and PhD Project Report, Journal Articles, Journal Bulletins, Conference Papers, UPM News, Newspaper Cuttings, Patents and Inaugural Lectures.

As the policy of the university does not permit users to view thesis in full text, access is only given to the first 24 pages only.