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Title: Quantitative morphological and compositional evaluation of laboratory prepared aluminoborosilicate glass surfaces

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Journal Article: Publisher's Accepted Manuscript
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Applied Surface Science
Additional Journal Information:
Journal Volume: 324; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-14 16:15:45; Journal ID: ISSN 0169-4332
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Gong, Yuxuan, Wren, Anthony W., and Mellott, Nathan P. Quantitative morphological and compositional evaluation of laboratory prepared aluminoborosilicate glass surfaces. Netherlands: N. p., 2015. Web. doi:10.1016/j.apsusc.2014.10.132.
Gong, Yuxuan, Wren, Anthony W., & Mellott, Nathan P. Quantitative morphological and compositional evaluation of laboratory prepared aluminoborosilicate glass surfaces. Netherlands. doi:10.1016/j.apsusc.2014.10.132.
Gong, Yuxuan, Wren, Anthony W., and Mellott, Nathan P. 2015. "Quantitative morphological and compositional evaluation of laboratory prepared aluminoborosilicate glass surfaces". Netherlands. doi:10.1016/j.apsusc.2014.10.132.
title = {Quantitative morphological and compositional evaluation of laboratory prepared aluminoborosilicate glass surfaces},
author = {Gong, Yuxuan and Wren, Anthony W. and Mellott, Nathan P.},
abstractNote = {},
doi = {10.1016/j.apsusc.2014.10.132},
journal = {Applied Surface Science},
number = C,
volume = 324,
place = {Netherlands},
year = 2015,
month = 1

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Publisher's Version of Record at 10.1016/j.apsusc.2014.10.132

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  • This paper presents the structural and crystallization study of a rare-earth-rich aluminoborosilicate glass that is a simplified version of a new nuclear glass proven to be a potential candidate for the immobilization of highly concentrated radioactive wastes that will be produced in the future. In this work, we studied the impact of changing the nature of alkali (Li{sup +}, Na{sup +}, K{sup +}, Rb{sup +}, Cs{sup +}) or alkaline-earth (Mg{sup 2+}, Ca{sup 2+}, Sr{sup 2+}, Ba{sup 2+}) cations present in glass composition on glass structure (by {sup 27}Al and {sup 11}B nuclear magnetic resonance spectroscopy) and on its crystallization tendencymore » during melt cooling at 1 K/min (average cooling rate during industrial process). From these composition changes, it was established that alkali cations were preferentially involved in charge compensation of (AlO{sub 4}){sup -} and (BO{sub 4}){sup -} entities in the glassy network comparatively to alkaline-earth cations. Whatever the nature of alkali cations, glass compositions containing calcium gave way to the crystallization of an apatite silicate phase bearing calcium and rare-earth (RE) cations (Ca{sub 2}RE{sub 8}(SiO{sub 4}){sub 6}O{sub 2}, RE = Nd or La) but melt crystallization tendency during cooling strongly varied with the nature of alkaline-earth cations.« less
  • The authors have investigated using scanning tunneling microscopy (STM) and Auger electron spectroscopy (AES) the growth and structural evolution of Pt-Si intermetallic phases formed via a chemical vapor deposition (CVD) mediated process. The Pt silicide thin films were prepared though the exposure of a Pt(111) crystal to silane (SiH{sub 4}) followed by various annealing treatments. The deposition of Si via the decomposition of silane at room temperature preferentially forms clusters at step edges that avoid the centers of Pt terraces. The sizes and coverages of the clusters increases with silane exposure. The clusters are of intermetallic character (composed of bothmore » Si and Pt) and coarsen to give cluster heights much larger than a Pt(111) step height. These observations implicitly establish that Si interdiffusion in the near-surface region is weakly activated. Studies performed as a function of the silane exposure and annealing temperature reveal a complicated phase behavior that incorporates seven separate atomically ordered phases in addition to large-scale surface features such as three-dimensional islands. Growth and degradation mechanisms have been constructed, and the phenomena observed are contrasted with standard kinetic models based on sequential phase growth.« less
  • Whole head fractionated doses of 200 R and 150 R were initiated postnatally in five experimental age groups (birth, 1-week, 2-week, 3-week and 4-week) and continued over a period of 14 or 20 days to prevent reconstitution of the external granular layer. Animals irradiated at birth displayed minor deficits in behavior, which included ataxia, tremor, hypertonus and dysmetria, while animals irradiated at 1-week showed only mild symptoms of hypermetria. All other animals displayed no motor deficits. Animals irradiated at birth had smaller eyes and ears, a reduction in the size of the entire head and were susceptible to seizures. Allmore » animals were sacrified at 70 days of age. The cerebellum was found to be reduced in size and weight, the greatest deficit being seen in animals x-irradiated at the very early ages. Newborn condition animals were found to have large compliments of interneurons in the molecular layer, an established internal granular layer, and Purkinje cells were found to have a normal orientation, position, and to be unreduced in number or size. This experiment confirmed that the critical period in the development at which damage would result in behavioral abnormalities was from birth to five days, while for neuroanatomical abnormalities, this critical period was from birth to 18 days.« less
  • An ultrasonic sol/gel technique has been used to process aluminoborosilicate glass and its composite with carbon fiber reinforcement. In this new technique, ultrasonic energy is used in place of alcohol solvent. Gel time is easily controlled by varying the amount of ultrasonic energy and the resulting gel also exhibits less shrinkage during the densification process. The sonogel-based composite has lower flexural strengths than the alcogel and has close values between the measured moduli, while still retaining the same fracture toughness. Micromechanical analysis produces higher values; however, it is suspected that the in situ modulus of matrix is lower than themore » value used in the analysis.« less
  • A method of surface decoration has been proposed to broaden the assortment of heat-proof glass containers and improve the operating characteristics. The studies were conducted on samples of a heat-proof aluminoborosilicate container from the Merefyansk Glass Works having the following composition (concentration by weight, %): 59.6 {+-} 1.0 SiO{sub 2}, 2 {+-} 0.3 B{sub 2}O{sub 3}, 17 {+-} 0.7 Al{sub 2}O{sub 3} + Fe{sub 2}O{sub 3}, 1 {+-} 0.3 ZrO{sub 2}, 3 {+-} 0.3 ZnO, 4 {+-} 0.3 BaO, 7.1 {+-} 0.4 CaO, 4 {+-} 0.3 MgO, 2.3 {+-} 0.3 As{sub 2}O{sub 3}. The density of the glass was 2.61more » g/cm{sup 3}, and the TCLE was 4.2{center_dot}10{sup {minus}7}{degrees}C{sup {minus}1}. Iron oxides were selected as the coating material. Effects on microhardness, corrosion resistance and acid resistance were determined.« less