Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions
A new technique for optoacoustic determination of phase transitions is described, based on the resonant piezoelectric detection of the acoustic signal generated by the thermal excitation of the sample by means of a low power modulated diode laser. The technique does not make use of a gas cell and a...
| Autores principales: | , , |
|---|---|
| Publicado: |
1999
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02578972_v122_n1_p28_Cesa http://hdl.handle.net/20.500.12110/paper_02578972_v122_n1_p28_Cesa |
| Aporte de: |
| id |
paper:paper_02578972_v122_n1_p28_Cesa |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_02578972_v122_n1_p28_Cesa2023-06-08T15:22:04Z Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions Cesa, Yanina Mingolo, Nélida Martínez, Oscar Eduardo Glassy metals Optoacoustic detection Phase transformations Photoacoustic detection Amplifiers (electronic) Crystallization Natural frequencies Phase transitions Photoacoustic effect Piezoelectricity Semiconductor lasers Resonant piezoelectric optoacoustic detection Metallic glass A new technique for optoacoustic determination of phase transitions is described, based on the resonant piezoelectric detection of the acoustic signal generated by the thermal excitation of the sample by means of a low power modulated diode laser. The technique does not make use of a gas cell and a microphone, but instead uses a piezoelectric detector in contact with the sample holder and a diode laser modulated at the resonant frequency of the detector. The signal is filtered by a phase-sensitive amplifier (lock-in), providing information on the amplitude and phase of the acoustic wave. It is shown that the technique is particularly sensitive to glass-crystalline transitions, with a distinctive decrease in the phase of the signal attributed to the large decrease in the heat capacity upon crystallization of the glass. The high sensitivity of the method should make it particularly adequate for the determination of the stability of amorphous films over crystalline substrates or glassed surfaces. © 1999 Elsevier Science S.A. Fil:Cesa, Y. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mingolo, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martínez, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02578972_v122_n1_p28_Cesa http://hdl.handle.net/20.500.12110/paper_02578972_v122_n1_p28_Cesa |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Glassy metals Optoacoustic detection Phase transformations Photoacoustic detection Amplifiers (electronic) Crystallization Natural frequencies Phase transitions Photoacoustic effect Piezoelectricity Semiconductor lasers Resonant piezoelectric optoacoustic detection Metallic glass |
| spellingShingle |
Glassy metals Optoacoustic detection Phase transformations Photoacoustic detection Amplifiers (electronic) Crystallization Natural frequencies Phase transitions Photoacoustic effect Piezoelectricity Semiconductor lasers Resonant piezoelectric optoacoustic detection Metallic glass Cesa, Yanina Mingolo, Nélida Martínez, Oscar Eduardo Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| topic_facet |
Glassy metals Optoacoustic detection Phase transformations Photoacoustic detection Amplifiers (electronic) Crystallization Natural frequencies Phase transitions Photoacoustic effect Piezoelectricity Semiconductor lasers Resonant piezoelectric optoacoustic detection Metallic glass |
| description |
A new technique for optoacoustic determination of phase transitions is described, based on the resonant piezoelectric detection of the acoustic signal generated by the thermal excitation of the sample by means of a low power modulated diode laser. The technique does not make use of a gas cell and a microphone, but instead uses a piezoelectric detector in contact with the sample holder and a diode laser modulated at the resonant frequency of the detector. The signal is filtered by a phase-sensitive amplifier (lock-in), providing information on the amplitude and phase of the acoustic wave. It is shown that the technique is particularly sensitive to glass-crystalline transitions, with a distinctive decrease in the phase of the signal attributed to the large decrease in the heat capacity upon crystallization of the glass. The high sensitivity of the method should make it particularly adequate for the determination of the stability of amorphous films over crystalline substrates or glassed surfaces. © 1999 Elsevier Science S.A. |
| author |
Cesa, Yanina Mingolo, Nélida Martínez, Oscar Eduardo |
| author_facet |
Cesa, Yanina Mingolo, Nélida Martínez, Oscar Eduardo |
| author_sort |
Cesa, Yanina |
| title |
Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| title_short |
Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| title_full |
Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| title_fullStr |
Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| title_full_unstemmed |
Resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| title_sort |
resonant piezoelectric optoacoustic detection of surface and bulk phase transitions |
| publishDate |
1999 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02578972_v122_n1_p28_Cesa http://hdl.handle.net/20.500.12110/paper_02578972_v122_n1_p28_Cesa |
| work_keys_str_mv |
AT cesayanina resonantpiezoelectricoptoacousticdetectionofsurfaceandbulkphasetransitions AT mingolonelida resonantpiezoelectricoptoacousticdetectionofsurfaceandbulkphasetransitions AT martinezoscareduardo resonantpiezoelectricoptoacousticdetectionofsurfaceandbulkphasetransitions |
| _version_ |
1768543896330043392 |