Laser Beam Deflection System For Measuring Stress Variations In Thin Film Electrodes

The bending beam method for measurements of stress in thin films deposited on an elastic substrate in the form of a thin stripe has been improved by the introduction of a laser beam deflection system and of a laser spot position detector. With this improvement, stress measurements have been performed in situ during the electrochemical reactions of palladium hydride formation and of valve metal anodic oxidation. Stress changes in the thin films of 107 N/m2 can be measured with a time response better than 1s. This allows the detection of rapid reactions (like H diffusion in a Pd thin film) and of the electrostriction effect even in anodic films with thickness below 20 nm.13741150115

Optomechanical studies of lithium intercalation in amorphous molybdenum thin films

In this work, we studied radio-frequency reactively sputtered molybdenum oxide thin films. Thin films with distinct stoichiometries were obtained by varying the oxygen now and maintaining all other deposition parameters constant. The relationship between optical, electrochemical, and mechanical behavior of the films submitted to lithium intercalation in an aprotic electrolyte is reported. Films deposited at low oxygen flow (B-films) are substoichiometric molybdenum oxide, with composition MoO3-x (0 < x < 1). Films deposited at high oxygen flow (T-films) approach the MoO3 stoichiometry. B-films have a greater concentration of optically active sites and a more open structure when compared to T-films.14392822282

Time Evolution Of The Residual Stress Of Plasma-polymerized Acetylene Films In Various Ambients

The behavior of the residual stress with time of plasma-polymerized acetylene films in various ambients has been investigated. The plasma polymers were deposited on thin glass substrates in dc and rf discharges of acetylene. After deposition, the specimens were mounted in a chamber that could be evacuated or filled with air, oxygen, or nitrogen. Stress measurements were carried out by the bending beam method, using a He-Ne laser. A steady rise in the stress during time periods of several hours following film deposition was observed in most of the samples studied. Stress increments of more than one order of magnitude were detected in some of the films upon exposure to air. Pronounced stress increments were also observed during exposure to oxygen. Rises in the stress were detected even in a vacuum ambience. Nitrogen exposure was found to have little effect on the stress. The effect of the moisture content of air on the stress was also examined. The evolution of the stress was found to depend also on the film preparation conditions. The results strongly suggest that postplasma reactions involving active chemical species trapped in the film during deposition play an important role in the development of the stress.7094883488

The nature of the silicaphilic fluorescence of PDMPO

PDMPO (2-(4-pyridyl)-5-((4-(2-dimethylaminoethylaminocarbamoyl)methoxy)phenyl)oxazole), has unique silica specific fluorescence and is used in biology to understand biosilicification. This ‘silicaphilic’ fluorescence is not well understood nor is the response to local environmental variables like solvent and pH. We investigated PDMPO in a range of environments: using UV-vis and fluorescence spectroscopy supported by computational data, (SPARC, molecular dynamics simulations, density functional theory calculations), dynamic light scattering and zeta potential measurements to understand the PDMPO–silica interaction. From absorption data, PDMPO exhibited a pKa of 4.20 for PDMPOH22+ to PDMPOH+ . Fluorescence emission measurements revealed large shifts in excited state pKa* values with different behaviour when bound to silica (pKa* of 10.4). PDMPO bound to silica particles is located in the Stern layer with the dye exhibiting pH dependent depolarising motion. In aqueous solution, PDMPO showed strong chromaticity with correlation between the maximum emission wavelength for PDMPOH+* and dielectric constant (4.8–80). Additional chromatic effects were attributed to changes in solvent accessible surface area. Chromatic effects were also observed for silica bound dye which allow its use as a direct probe of bulk pH over a range far in excess of what is possible for the dye alone (3–5.2). The unique combination of chromaticity and excited state dynamics allows PDMPO to monitor pH from 3 to 13 while also reporting on surface environment opening a new frontier in the quantitative understanding of (bio)silicification

XRD and IR Dataset of LiCoO2 cathode thermal-treated up to 400 °C

Data are the raw data obtained from X-ray diffraction (XRD) and infrared transmittance (IR) measurements performed on LiCoO2 samples.The data describe the effects of heat-treatments at different temperatures on the crystalline structure (XRD data) and on chemical composition (IR data) of LiCoO2 cathode material.Data are presented in the Comma-separated Values (CSV) format and also in the (OPJ) format suitable for the Origin - Data Analysis and Graphing Software

Data for the paper Crystalline phases, relative masses and stoichiometry of mixed oxide cathodes determined by XRD and XRF measurements

X-ray diffraction and energy dispersion X-ray fluorescence data for cathode materials of Li-ion batteries. Samples named as Blend, Cath1, Cath2, Cath3

Homogeneity Range Of The Superconducting Chevrel Phase:snmo6sx

The homogeneity range of the superconducting Chevrel phase SnMo6Sx was studied as a function of sulfur content (6.9 ≤ × ≤ 8.0). X-ray diffraction, lattice parameter and superconducting temperature measurements plus corrections for unintentional oxygen addition indicate a very narrow homogeneity range around the composition SnMo6S7.5 at the oxygen solubility limit. © 1988.13417576Hinks, Jorgensen, Li, (1984) Solid State Commun., 49, p. 51Capone, II, Guertin, Foner, Hinks, Li, (1983) Phys. Rev. Lett., 51, p. 601Hinks, Jorgensen, Li, (1983) Phys. Rev. Lett., 51, p. 1911Foner, McNiff, Jr., Hinks, (1985) Phys. Rev. B, 31, p. 6108Wright, Holmgren, Friedmann, Maher, Pazol, Ginsberg, (1987) J. Low Temp. Phys., 68, p. 109Wagner, Freyhardt, (1982) J. Phys. Chem. Solids, 43, p. 177Gardimier, Chang, Phase relationships in the systems MoSnS, WSnS and MoWS (1978) Journal of the Less Common Metals, 61, p. 221Flükiger, (1981) Superconductor materials science: metallurgy, fabrication and applications, p. 511. , S. Foner, B.B. Schwartz, Plenum, New YorkN. Sadakata, T. Kuroda, M. Suenaga and R.L. Sabatini, preprint BNL 38794 (1987

XRD and IR Dataset of LiCoO2 cathode thermal-treated up to 400 °C

Data are the raw data obtained from X-ray diffraction (XRD) and infrared transmittance (IR) measurements performed on LiCoO2 samples.The data describe the effects of heat-treatments at different temperatures on the crystalline structure (XRD data) and on chemical composition (IR data) of LiCoO2 cathode material.Data are presented in the Comma-separated Values (CSV) format and also in the (OPJ) format suitable for the Origin - Data Analysis and Graphing Software