Browsing by Author "Saleh, Adli A."

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Dielectric relaxation and piezoelectric coupling in the mixed proton-glass crystal K0.61(NH4)0.39H2PO4,
(1993-11-01) Tu, Chi-Shun; Schmidt, V. Hugo; Saleh, Adli A.
Measurements of the dielectric permittivities in the mixed proton-glass crystal K0.61(NH4)0.39H2PO4 are reported from 20 Hz to 200.8 MHz and for fields along both the a and c axes. Between 14 and 50 K, the c-axis permittivity outside the piezoelectric-resonance range shows a temperature-dependent spread in relaxation times but cannot be fit accurately with the Cole-Cole formula. Strong piezoelectric resonance for a field along the c axis was observed in the region between 100 kHz and 10 MHz.
Ion beam induced adhesion in Al/diamond bilayer
(1991-07-01) Saleh, Adli A.; Smith, R. J.; Shutthanandan, Vaithiyalingam; Bao, Z. X.; Schmidt, V. Hugo
Diamond anvil cells are often used to study phase transitions in materials under high pressure. To probe these transitions, electrodes with low resistance and good adhesion properties are desired. Such electrodes were obtained using ion beam mixing techniques. The diamond anvil was first irradiated with a 100 keV Ar+ beam with an ion dose of 1016 ions/cm 2. Resistance measurements of the irradiated area indicated that ion beam damage induced a low-resistance phase of carbon. A thin Al film (≈ 500 Å) was then deposited on the diamond anvil followed by Ar+ irradiation. The deposition and irradiation processes were repeated, followed by resistance measurements after each irradiation. The measurements indicate the formation of a low resistance layer (R ≈ 10gW). A qualitative test of adhesion was performed by scratching the formed layer with the resistance probes. The resistance of the electrode showed an acceptably small increase as a function of scraping. These results can be understood on the basis of recoil mixing in the Al/diamond system.