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| Title: | MEASUREMENTS OF THE TEMPERATURE COEFFICIENT OF ELECTRIC RESISTIVITY OF HYDROGEN OVERLOADED Pd
This work is supported by INFN-LNF, Frascati, Italy. |
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| DOI No: | 10.1142/9789812772985_0042 | |
| Source: | CONDENSED MATTER NUCLEAR SCIENCE (pp 404-410) | |
| Author(s): | ANTONIO SPALLONE
INFN-LNF, Via Enrico Fermi, 00044 Frascati (Rome), Italy FRANCESCO CELANI INFN-LNF, Via Enrico Fermi, 00044 Frascati (Rome), Italy PAOLO MARINI EURESYS, Via Lero 30, 00129 Rome, Italy VITTORIO DI STEFANO EURESYS, Via Lero 30, 00129 Rome, Italy |
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| Abstract: | As reported in previous papers, we performed many electrolytic loading tests using thin Pd wires, achieving loading ratios of H/Pd ≥ 0.95 (H/Pd over-loading). In particular, we defined a reproducible "loading protocol" suitable for achieving such an over-loading level, based on the use of very diluted acid electrolytic solutions (with additions of tenths of micro-moles of Ca or Sr or Li cations and some hundred nano-moles of Hg ions) and operating with electrolytic current cycles from a few mA up to one hundred mA. By observing the day/night cyclic fluctuations of electrical resistance, as a function of the corresponding temperature variations, of stable, long term, H/Pd loadings we were able to calculate the temperature coefficient of resistivity (Kθ) of the Pd–H system at very high H/Pd loadings. Many years ago (in 1998), we reported an unexpected value showing that the Kθ parameter values increase when H/Pd exceeds 0.75 (i.e. after that R/R0 goes beyond the 1.8 peak value, i.e. to the right side of the R/R0/H/Pd curve). This fact was confirmed by the ISR-Stanford Group (McKubre and Tripodi) and Pirelli-Research Group (Gamberale and Garbelli). In this paper we show several measurements of Kθ at different overloading values of H/Pd up to ≅1 (corresponding at R/R0 = 1.12) where Kθ=(13 ± 1) × 10-3 K-1, i.e. more than six times higher than the minimum value achieved at the R/R0 = 1.8 peak value. This result can corroborate the hypothesis that a new Pd–H phase (full β-phase or the beginning of β + γ phase) could occur after the H/Pd = 0.75 loading ratio (at the end of α + β phase), as claimed by many authors as the necessary condition for excess (anomalous) heat from Pd–D system (at D/Pd ≥ 1). | |
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