Lifetime of the phonons in the PLT ceramic

Journal Article · Wed Nov 05 00:00:00 EST 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4901649· OSTI ID:22390539

Barba-Ortega, J., E-mail: [e-mail]; Joya, M. R., E-mail: [e-mail] ^[1]; Londoño, F. A., E-mail: [e-mail] ^[2]

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1. Departamento de Física, Universidad Nacional de Colombia, carrera 30 # 45-03, Bogotá 1149 (Colombia)
2. Instituto de Física, Universidad de Antioquia, Calle 67 #53-108 Of.6-105, Medellin (Colombia)

The lifetimes at higher temperatures on lanthanum-modified lead titanate (PLT) are mainly due to the anharmonic decay of optical phonons into low-energy phonons. The temperature-independent contributions from inherent crystal defects and from boundary scattering become comparable to the phonon scattering contribution at lower temperatures. The thermal interaction is large at higher temperatures which decreases the phonon mean free path, and so the decay lifetime decreases as the temperature of the system is increased. This leads to the increased line width at higher temperatures. We made an estimate of the lifetimes for different concentrations and temperatures in PLT.

• OSTI ID: 22390539
• Journal Information: AIP Conference Proceedings, Vol. 1627, Issue 1; Conference: 14. Electroceramics Conference, Bucharest (Romania), 16-20 Jun 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
CRYSTAL DEFECTS
LANTHANUM COMPOUNDS
LEAD COMPOUNDS
LIFETIME
LINE WIDTHS
MEAN FREE PATH
PHONONS
SCATTERING
TEMPERATURE DEPENDENCE
TITANATES