Producción CyT
Informe Técnico
Autoría
Castro, F.
;
MEYER, GABRIEL OMAR
Resumen
Información suministrada por el agente en
SIGEVA
We present a new equipment developed to perform Thermal Desorption Spectroscopy (TDS) experiments in metal-hydrogen systems. The very simple and inexpensive experimental setup includes a reactor chamber where the specimen is located, a high density cartridge heater, temperature and pressure sensors, a commercial mass flow meter and a PC for data acquisition and control.The apparatus was tested studying the Pd-H system (palladium in a powder form with 1 μm average diameter). Depending on the ...
We present a new equipment developed to perform Thermal Desorption Spectroscopy (TDS) experiments in metal-hydrogen systems. The very simple and inexpensive experimental setup includes a reactor chamber where the specimen is located, a high density cartridge heater, temperature and pressure sensors, a commercial mass flow meter and a PC for data acquisition and control.The apparatus was tested studying the Pd-H system (palladium in a powder form with 1 μm average diameter). Depending on the initial hydrogen concentration (c0) the typical spectrum is composed of one or two peaks. For higher c0 values (two desorption peaks) the low temperature peak (≈ 200 K) is related to desorption of hydrogen dissolved in the hydride phase (β) of the Pd-H system and the high temperature peak (≈ 280 K) is related to desorption during hydride decomposition, i.e. in the two-phase field (α+β).The results are analyzed in terms of a model that considers bulk or surface controlled desorption in one or two-phase metal-hydrogen systems. The shape of the spectra and the dependence of the temperature of maximum flux on c0 points to surface related processes as the rate limiting mechanism for hydrogen desorption.
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