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Post by jfox on Dec 16, 2015 19:14:36 GMT -6
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Post by tileman2 on Dec 16, 2015 22:28:14 GMT -6
Section 1.2.1 "ionic colors". The chemistry books I have been reading describe the primary identifiers of an ionic compound as crystals. Covalent bonding can occur in certain controlled conditions: but this type of bonding is usually associated with organic compounding. The two points of interest was the use of Antimony Oxide- a metalloid in the same class as SiO2 and Boron. Rare earth oxides were also mentioned: because of how they refract the UV spectrum. Two years ago I recall reading a piece on doping: how they doped Samarium with Yttrium to produce red in TV sets.I have the glass makers/ glass blowers encyclopedia upstairs; I seem to recall a section about ruby red. 50% of our recipe is glass; might be some application there.
Tom
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Post by jfox on Dec 17, 2015 9:14:53 GMT -6
there is a lot of great stuff in there Mo Se and neodymium reds ,i have some antimony,also extensive work on striking
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Post by tileman2 on Dec 17, 2015 14:27:53 GMT -6
I am getting through the 85 pages; lots to digest. Section 2.2.1 "the role of tin' Really? After doing more reading and sorting through the chemistry books: simple premise: A covalent bond requires a shared electron valence: same definition of a molecule.Two elements bonded by sharing one orbital. An ionic bond ( chemical bond ) are two elements bonded together by electrostatic forces. There is no sharing of electron/ valences. Ionic bonds most always form crystals with repeating patterns of positive (zinc) and negative (SiO2) valences. The formula determining a true ionic bond is adding the two primary elements, less the electronegative element: result must be higher than 2.1 ZNO 1.65 plus SiO2 1.90 = 3.55 minus lithium .98 = 2.57 (making it a true ionic bond = zinc silicate. Gibbs Free Energy is also the correct application in determining thermodynamic forces. Reactants +/- = product. If the formula is positive then Gibbs applies, if 0 equallibra applies; if negative then other thermodynamic equations apply. Should have bought these books along time ago; needed something that connected the dots. Take this pop quiz- when you fill it (feel free to cheat like I did) and it will teach you the differences between bonds. search.yahoo.com/yhs/search?p=ionic+bonds+worksheet&ei=UTF-8&hspart=mozilla&hsimp=yhs-003Note: You will see a group of images when you hit the above link: count to the 11th image and click it. "Chapter 6" Ionic bonds. Tom |
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