The kinetics and mechanism of MgO dissolution

Mejías, José A.; Berry, Andrew J.; Refson, Keith; Fraser, Dean

doi:10.1016/s0009-2614(99)00909-4

Cited by 112 publications

(92 citation statements)

References 27 publications

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“…The thickness of Mg layer is fi xed at 300 nm. The analytical results from Equation (38) and Equation (39) agree well with the experiments. The dissolution time increases substantially with the thickness of encapsulation layer, which provides an effective way to control the dissolution time.…”

Section: Double-layer Reactive Diffusionsupporting

confidence: 77%

An Analytical Model of Reactive Diffusion for Transient Electronics

Cheng²,

et al. 2013

Adv Funct Materials

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Transient electronics is a class of technology that involves components which physically disappear, in whole or in part, at prescribed rates and at programmed times. Enabled devices include medical monitors that fully resorb when implanted into the human body (“bio‐resorbable”) to avoid long‐term adverse effects, or environmental monitors that dissolve when exposed to water (“eco‐resorbable”) to eliminate the need for collection and recovery. Analytical models for dissolution of the constituent materials represent important design tools for transient electronic systems that are configured to disappear in water or biofluids. Here, solutions for reactive‐diffusion are presented in single‐ and double‐layered structures, in which the remaining thicknesses and electrical resistances are obtained analytically. The dissolution time and rate are defined in terms of the reaction constants and diffusivities of the materials, the thicknesses of the layer, and other properties of materials and solution. These models agree well with the experiments for single layers of Mg and SiO2, and double layers of Mg/MgO. The underlying physical constants extracted from analysis fall within a broad range previously reported in other studies; these constants can be extremely sensitive to the morphologies of the materials, temperature, and the PH value, concentration, and properties of the surrounding liquid.

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Section: Double-layer Reactive Diffusionsupporting

confidence: 77%

An Analytical Model of Reactive Diffusion for Transient Electronics

Cheng²,

et al. 2013

Adv Funct Materials

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“…Figure 6 shows high resolution images of how the individual particle morphology of the unsintered samples starts as a cubic shape, characteristic of MgO. After about four hours of drying, the characteristic brucite flake-like structure (Kumari et al, 2009) is dominant in the sample, as growth of (111) crystal planes are highly favored over others (Mejias et al, 1999). Low resolution images ( Figure 7) show that as more brucite forms in the quiescent sample the particles decrease in size, as observed previously in the particle size analysis.…”

Section: Effect Of Ball Milling and The Hydrolysis Of Magnesium Oxidementioning

confidence: 99%

New composite separator pellet to increase power density and reduce size of thermal batteries

Mondy

Roberts

Grillet

et al. 2013

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We show that it is possible to manufacture strong macroporous ceramic films that can be backfilled with electrolyte to form rigid separator pellets suitable for use in thermal batteries. Several new ceramic manufacturing processes are developed to produce sintered magnesium oxide foams with connected porosities of over 80% by volume and with sufficient strength to withstand the battery manufacturing steps. The effects of processing parameters are quantified, and methods to imbibe electrolyte into the ceramic scaffold demonstrated. Preliminary single cell battery testing show that some of our first generation pellets exhibit longer voltage life with comparable resistance at the critical early times to that exhibited by a traditional pressed pellets. Although more development work is needed to optimize the processes to create these rigid separator pellets, the results indicate the potential of such ceramic separator pellets to be equal, if not superior to, current pressed pellets. Furthermore, they could be a replacement for critical material that is no longer available, as well as improving battery separator strength, decreasing production costs, and leading to shorter battery stacks for long-life batteries. 4

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“…While water absorbs readily on the MgO(100) surface, experimental evidence and calculations suggest that a perfect MgO(100) surface is stable against hydroxylation, and that MgO dissolution and pitting only occur at the surface defects. 20 The IBAD MgO samples stored in the atmosphere (or even in a nitrogen purge box for extended periods) will change from a smooth mirrorlike surface to a pitted, rough finish. The IBAD MgO samples were exposed to the atmosphere for the minimum possible time before heteroepitaxy, however, some exposure to the atmosphere was inevitable during the sample transfers between the deposition chambers.…”

Section: A Biaxially Textured Mgo Substratementioning

confidence: 99%

“…The sol-gel solution contains water, which is known to dissolve and pit the defective MgO films. 20 Additionally, the solution contains acetylacetone. We have observed that acetone vapors effectively degrade the IBAD MgO films and a similar affect might be expected for acetylacetone.…”

Section: Effect Of Ex Situ Deposition On the Mgo Templatementioning

confidence: 99%

Growth of biaxially textured BaxPb1−xTiO3 ferroelectric thin films on amorphous Si3N4

Brewer

Boyd

El‐Naggar

et al. 2004

Journal of Applied Physics

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We prepared highly aligned, biaxially textured Ba x Pb 1−x TiO 3 (PBT) on amorphous Si 3 N 4 by using an ion-beam-assisted deposited MgO as a template layer. PBT was deposited on a biaxially textured MgO using sol-gel synthesis, metal-organic chemical-vapor deposition, and molecular beam epitaxy. The biaxial texture of the PBT was inherited from the MgO template. The reflection high-energy electron diffraction (RHEED) and cross-section transmission electron microscopy (TEM) experiments suggest that exposure of the MgO template to atmospheric moisture before PBT heteroepitaxy resulted in a significant narrowing of the PBT in-plane orientation distribution. The microstructures of the biaxially textured PBT films were analyzed by x-ray diffraction, RHEED, and TEM. The dynamic contact mode electrostatic force microscopy polarization hysteresis loops confirmed that these films are ferroelectric.

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The kinetics and mechanism of MgO dissolution

Cited by 112 publications

References 27 publications

An Analytical Model of Reactive Diffusion for Transient Electronics

An Analytical Model of Reactive Diffusion for Transient Electronics

New composite separator pellet to increase power density and reduce size of thermal batteries

Growth of biaxially textured BaxPb1−xTiO3 ferroelectric thin films on amorphous Si3N4

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