Post-depositional

The stmcture of the polysihcon depends on the dopants, impurities, deposition temperature, and post-deposition heat annealing. Deposition at less than 575°C produces an amorphous stmcture deposition higher than 625°C results in a polycrystalline, columnar stmcture. Heating after deposition induces crystallization and grain growth. Deposition between 600 and 650°C yields a columnar stmcture having reasonable grain size and (llO)-preferred orientation. 

Thin films formed by atomistic deposition techniques are unique materials that seldom have handbook properties. Properties of these thin films depend on several factors (4), including substrate surface condition, the deposition process used, details of the deposition process and system geometry, details of film growth on the substrate surface, and post-deposition processing and reactions. For some appHcations, such as wear resistance, the mechanical properties of the substrate is important to the functionaHty of the thin film. In order to have reproducible film properties, each of these factors must be controUed. 

Mizuta, T. (1988) Compositional homogenization of sphalerite in hydrothermal ore deposits of Japan by post-depositional diffusion processes with particular reference to metamorphosed Besshi-type deposits. Mining Geology, 38, 263-278. 

The most susceptible material for post-depositional loss or addition of radionuclides is the outer layer of samples that have been exposed to moisture for a long duration. Stratigraphic consistency between ages of the outermost material and that deposited prior to this provides valuable constraints on the technique. Four ages were derived for a band of clear, white calcite deposited on a stalactite from 53.6 m below sea level in a blue hole of Andros, Bahamas (Richards et al. 1994). Isotopic data for the outermost surface, which had been exposed to sea water for at least 8 ka was indistinguishable from the internal material (Fig. 8). 

Despite the inherent problems associated with in speleothems, recent work by Beck et al. (2001) has focused attention on this topic because they demonstrated that in certain circumstances the dcp correction may be sufficiently well constrained that calibration of the radiocarbon timescale might be possible. Speleothems have an advantage over marine corals (e g., Bard et al. 1990, 1998 Edwards et al. 1993), which have been used to extend the calibration curve, because they provide continuous records and are less likely to be affected by post-depositional alteration. Beck et al. (2001)... 

Freestone, I. C. (2001), Post depositional changes in archaeological ceramics and glasses, in Brothwell, D. R. and A. M. Pollard (eds.), Handbook of Archaeological Sciences, Wiley, New York, pp. 615-626. 

Jin, M. H. -C. Banger, K. K. McNatt, J. S. Kelly, C. V. Dickman, J. E. Hepp, A. F. 2005. Post-deposition annealing of thin film CuInS2 made from a singlesource precursor. Proceedings of the 3P IEEE Photovoltaic Specialists Conference. IEEE, Piscataway, NJ. pp. 382-385. 

Ranjith, R. John T. T. Kartha C. S. Vijayakumar K. P. Abe T. Kashiwaba Y. 2007. Post-deposition annealing effect on In2S3 thin films deposited using SILAR technique. Mater. Sci. Semicond. Process. 10 49-55. 

Post depositional mobility by diffusion or by microorganism transport in pore water. 

Extensive work has been reported on the deposition of individual cell layers and of full anode-electrolyte-cathode fuel cells on metallic interconnect substrates, much of it by VPS, with no sintering or other post-deposition heat treatments required [112]. However, so far relatively thick YSZ electrolytes, approximately 25 to 35 pm, have been needed to provide sufficient gas tightness [108, 114], so further optimization of the process is required to produce thinner, gas-tight electrolytes. Peak power densities of 300 mW/cm2 have been reported at 750°C for APS single cells [114], with four-cell stacks exhibiting power densities of approximately 200 mW/cm2 at 800°C [55],... 

Cu deposited onto Ru(0001) at 100K grows in 2-d islands via a Frank-van der Merwe (layer by layer growth) mechanism up to 2 ML. The island sizes but not the basic growth mode are altered by a post-deposition anneal at 900 K. 

An additional problem in the study of archaeological ceramics is the possibility of post-depositional chemical alteration of the fabric. 

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