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Volumn 94, Issue 4, 2003, Pages 2331-2336

Continuous index of refraction measurements to 20 GPa in Z-cut sapphire

Author keywords

[No Author keywords available]

Indexed keywords

COPPER; INTERFACES (MATERIALS); INTERFEROMETERS; INTERFEROMETRY; MAGNETIC FIELD EFFECTS; PARTICLE ACCELERATORS; SAPPHIRE; SINGLE CRYSTALS; SURFACES;

EID: 0041422235     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1595710     Document Type: Article
Times cited : (43)

References (19)
  • 1
    • 0043066996 scopus 로고    scopus 로고
    • note
    • The index of refraction also has the temperature dependence (see Ref. 17). However, in the experiments described here, sapphire is elastically compressed to ∼20 GPa and the associated temperature rise is only about 12 K. So, although density is formally a parameter in this study, the dependence of the measured index of refraction on density is essentially isothermal.
  • 5
    • 0043066993 scopus 로고    scopus 로고
    • note
    • The dominant entropy-producing mechanism in ICE is unknown. To date, no deviation from simple wave behavior has been measured in any of our ramp wave experiments on single-phase metals, indicating that the dissipation is small. If the chief dissipation mechanism in the present experiments is plastic work, even with work hardening to say 0.5 GPa included, then total irreversible work is of order 5 kJ/kg for compression to 25 GPa, the peak stress in copper. This corresponds to an isentrope that originates at only ∼10 K above ambient temperature at zero stress, too small to negate our assumption that compression in the present experiments is isentropic.
  • 10
    • 0043066990 scopus 로고    scopus 로고
    • note
    • 0. This special case is useful for the many window materials with linear index-density behavior because it illustrates that the VISAR window correction is the same for shock and ramp waves. The only caveat is for large strains when the temperature differences for shocks and ramps are large enough that the effect of temperature on the index of refraction cannot be ignored.
  • 11
    • 0041564090 scopus 로고    scopus 로고
    • note
    • 3. Isentropes do not depend on specific heat although we used the Dulong-Petit value, 3 nk, in our equation of state for estimating temperatures.
  • 16
    • 0042065381 scopus 로고    scopus 로고
    • Los Alamos National Laboratory (private communication)
    • J. E. Vorthman, Los Alamos National Laboratory (private communication).
    • Vorthman, J.E.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.