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Title: Acoustic Pulse Echoes Probed with Time-Resolved X-Ray Triple-Crystal Diffractometry

Abstract

Acoustic pulse echoes generated by femtosecond laser irradiation were detected using time-resolved x-ray triple-crystal diffractometry. The determined time-dependent longitudinal strain component for pulse echoes in silicon and gallium arsenide plates showed that the polarity of the strain pulse was dependent on the optically induced initial stress, and that the bipolar pulse waveform was gradually deformed and broadened in the course of propagation. The three-dimensional wave front distortion of pulse echoes was shown simply as the pulse duration broadening, which was consistent with a boundary roughness for an unpolished plate.

Authors:
 [1];  [2];  [3];  [2]; ;  [3]; ;  [4]
  1. Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ., Kasuga, Fukuoka 816-8580 (Japan)
  2. (Japan)
  3. RIKEN SPring-8 Center, Sayo-cho Sayo-gun, Hyogo 679-5148 (Japan)
  4. Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, Fukuoka 816-8580 (Japan)
Publication Date:
OSTI Identifier:
20778835
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevLett.96.115505; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTALS; GALLIUM ARSENIDES; LASER RADIATION; PLATES; PULSES; ROUGHNESS; SILICON; STRAINS; STRESSES; THREE-DIMENSIONAL CALCULATIONS; TIME DEPENDENCE; TIME RESOLUTION; WAVE FORMS; X-RAY DIFFRACTION

Citation Formats

Hayashi, Yujiro, RIKEN SPring-8 Center, Sayo-cho Sayo-gun, Hyogo 679-5148, Tanaka, Yoshihito, CREST, JST, Kirimura, Tomoyuki, Ishikawa, Tetsuya, Tsukuda, Noboru, and Kuramoto, Eiichi. Acoustic Pulse Echoes Probed with Time-Resolved X-Ray Triple-Crystal Diffractometry. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.96.1.
Hayashi, Yujiro, RIKEN SPring-8 Center, Sayo-cho Sayo-gun, Hyogo 679-5148, Tanaka, Yoshihito, CREST, JST, Kirimura, Tomoyuki, Ishikawa, Tetsuya, Tsukuda, Noboru, & Kuramoto, Eiichi. Acoustic Pulse Echoes Probed with Time-Resolved X-Ray Triple-Crystal Diffractometry. United States. doi:10.1103/PHYSREVLETT.96.1.
Hayashi, Yujiro, RIKEN SPring-8 Center, Sayo-cho Sayo-gun, Hyogo 679-5148, Tanaka, Yoshihito, CREST, JST, Kirimura, Tomoyuki, Ishikawa, Tetsuya, Tsukuda, Noboru, and Kuramoto, Eiichi. Fri . "Acoustic Pulse Echoes Probed with Time-Resolved X-Ray Triple-Crystal Diffractometry". United States. doi:10.1103/PHYSREVLETT.96.1.
@article{osti_20778835,
title = {Acoustic Pulse Echoes Probed with Time-Resolved X-Ray Triple-Crystal Diffractometry},
author = {Hayashi, Yujiro and RIKEN SPring-8 Center, Sayo-cho Sayo-gun, Hyogo 679-5148 and Tanaka, Yoshihito and CREST, JST and Kirimura, Tomoyuki and Ishikawa, Tetsuya and Tsukuda, Noboru and Kuramoto, Eiichi},
abstractNote = {Acoustic pulse echoes generated by femtosecond laser irradiation were detected using time-resolved x-ray triple-crystal diffractometry. The determined time-dependent longitudinal strain component for pulse echoes in silicon and gallium arsenide plates showed that the polarity of the strain pulse was dependent on the optically induced initial stress, and that the bipolar pulse waveform was gradually deformed and broadened in the course of propagation. The three-dimensional wave front distortion of pulse echoes was shown simply as the pulse duration broadening, which was consistent with a boundary roughness for an unpolished plate.},
doi = {10.1103/PHYSREVLETT.96.1},
journal = {Physical Review Letters},
number = 11,
volume = 96,
place = {United States},
year = {Fri Mar 24 00:00:00 EST 2006},
month = {Fri Mar 24 00:00:00 EST 2006}
}
  • Intense synchrotron radiation sources have enabled us to combine time-resolved measurements and triple-crystal diffractometry. The time-resolved triple-crystal diffractometry (TRTCD) determines the time-dependent dilational and shear components of deformation tensor, separately. The TRTCD experiments have been performed at a long undulator beamline of SPring-8. The time-resolved measurement system using pump-probe technique and a fast multi-channel scaler covers a full range of milliseconds with a time-resolution of several tens of picoseconds. The TRTCD with wide time range was applied to the dynamic strain measurement for semiconductor wafers irradiated by a femtosecond pulse laser. We observed a dilational component of acoustic echo pulsesmore » to analyze the time-varying pulse shape due to propagation. The lattice motion in the successively induced flexural standing wave has also been observed through a shear component.« less
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  • Nonisothermal densification in 8% yttria doped zirconia (8YSZ) particulate matter of 250 nm median particle size was studied under 215 V/cm dc electric field and 9 Degree-Sign C/min heating rate, using time-resolved in-situ high temperature energy dispersive x-ray diffractometry with a polychromatic 200 keV synchrotron probe. Densification occurred in the 876-905 Degree-Sign C range, which resulted in 97% of the theoretical density. No local melting at particle-particle contacts was observed in scanning electron micrographs, implying densification was due to solid state mass transport processes. The maximum current draw at 905 Degree-Sign C was 3 A, corresponding to instantaneous absorbed powermore » density of 570 W/cm{sup 3}. Densification of 8YSZ was accompanied by anomalous elastic volume expansions of the unit cell by 0.45% and 2.80% at 847 Degree-Sign C and 905 Degree-Sign C, respectively. The anomalous expansion at 905 Degree-Sign C at which maximum densification was observed is characterized by three stages: (I) linear stage, (II) anomalous stage, and (III) anelastic recovery stage. The densification in stage I (184 s) and II (15 s) was completed in 199 s, while anelastic relaxation in stage III lasted 130 s. The residual strains ({epsilon}) at room temperature, as computed from tetragonal (112) and (211) reflections, are {epsilon}{sub (112)} = 0.05% and {epsilon}{sub (211)} = 0.13%, respectively. Time dependence of (211) and (112) peak widths ({beta}) show a decrease with both exhibiting a singularity at 905 Degree-Sign C. An anisotropy in (112) and (211) peak widths of {l_brace} {beta}{sub (112)}/{beta}{sub (211)}{r_brace} = (3:1) magnitude was observed. No phase transformation occurred at 905 Degree-Sign C as verified from diffraction spectra on both sides of the singularity, i.e., the unit cell symmetry remains tetragonal. We attribute the reduction in densification temperature and time to ultrafast ambipolar diffusion of species arising from the superposition of mass fluxes due to Fickian diffusion, thermodiffusion (Soret effect), and electromigration, which in turn are a consequence of a superposition of chemical, temperature, and electrical potential gradients. On the other hand, we propose defect pile-up at particle-particle contacts and subsequent tunneling as a mechanism creating the 'burst-mode' discontinuous densification at the singularities observed at 847 and 905 Degree-Sign C.« less