By Gould R.F. (ed.)
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However, under cyclic loading, cracks in PSZ grow without cessation (13). Thus failure is somewhat analogous to fatigue-crack growth in metals. The mechanism of crack growth under cyclic load is not fully understood and is being investigated. Raman spectroscopy utilizing the two-dimensional detector and techniques described above can be used to map the transformed zone (14). A semi-automated experimental setup yields the fraction of monoclinic phase relative to the sum of the monoclinic and tetragonal phases, determined from the Raman spectrum, as a function of distance across the surface of the specimen.
J. Chern. Phys. 76, 710 (1982). 13. , and Yates, }. , Surf. , in press (1989). 14. , and Latta, E. , Surf. Sci. 57,475 (1976). 15. , J. Chern. Phys. 66, 5269 (1977). 16. , J. Chern. Phys. 60, 4719 (1974). Investigations of Materials at High Temperatures Using Raman Spectroscopy K. F. MCCARTY Sandia National Laboratories, Livermore, CA 94551-0969 ABSTRACT This paper will give a brief overview of the use of Raman spectroscopy to investigate materials at high temperatures. The first section describes the apparatus and experimental techniques necessary for in situ, high-temperature measurements.
2. Raman spectra of the carbon overcoats on magnetic media disks from two different manufacturers. Samples K1, K5, and K2 were sectioned from the same disk and annealed at 30,350, and 450°C, respectively. The data and fit, comprised of two peaks and a background (not shown), are shown for the four samples. 54 5 2 0 0 350 450 1562 1571 1575 1575 176 160 140 159 l393 1391 1386 1372 347 349 335 300 'The percentage of Sp3 bonding is obtained from the shift of the G-band. 5 for 2 nm grains, followed by a decrease in IdlIg (similar to that observed with coarser carbon (7» as the grains grow further.