ISSN:
1432-0630
Schlagwort(e):
78.20 Hp
;
74.30 Ek
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
,
Physik
Notizen:
Abstract A novel photothermal technique is developed, which enables the simultaneous measurement of the thermal diffusivity α, thermal conductivity κ, and the specific heat C of a sample. The technique is based on frequency-modulated time-delay photopyroelectric spectrometry (FM-TDPS), which consists of chirped laser excitation of the sample and detection of the thermal impulse response by a thin-film pyroelectric detector. No calibration is required for the measurements; absolute values for α, κ, and C may be obtained without having to employ a reference sample. Results on superconducting YBa2Cu3O7−x are reported for the temperature range 50–300 K; the values obtained compare favorably with reported measurements of α, κ, and C for YBa2Cu3O7−x , which previously required separate experiments for their determination.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00324766
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