Silver borate glasses

Recently, Silver and Bray (52) were able to differentiate and to estimate the relative proportions of three- and four-coordinated borons in binary borate glasses. This technique was thus adopted by the present author in order to ascertain the presence or absence of four-coordinated boron in liquid B203 (35). Glassy samples were quenched in liquid mercury from temperatures up to 1400°C but no four-coordinated boron was detected. (The lower limit of detectability was estimated to be about 2%.) Experiments were also carried out on liquid B203 up to 500°C but again no four-coordinated boron was found. It thus appeared that at least up to 500 or 600°C, the structural variation of liquid B203 with temperature is not primarily the result of a boron coordination change of from three to four. 

Typical fillers carbon black, calcium carbonate, dolomite, clays, calcinated clays, talc, soapstone, zinc oxide, filmed silica, borates, iron oxide, zinc oxide, magnesium carbonate, pulverized polyurethane foam, barium and strontium ferrites, magnesium aluminum silicate, nylon fibers, quartz in EMI shielding field silver plated aluminum, silver plated nickel, silver coated glass spheres, silver plated copper, silver, nickel and carbon black... 

Banhatti RD, Laughman D, Badr L, Funke K (2011) Nearly constant loss effect in sodium borate and silver meta-borate glasses new insights. Solid State Ion 192 70... 

Section with glass knives or diamond knife and ultramicrotome. Note Usually thick sections (1 pm) are cut, affixed to glass microscope slides, and stained 5-15 min at 40-50°C with toluidine blue solution (1 g toluidine blue and 1 g of sodium borate in 100 mL H20), The block is then refaced so that the trapezoid encompasses the desired tissue. Thin sections of gray, silver, or gold interference colors are cut. 

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