W appropriate coordination numbers lecture 12 7

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Unformatted text preview: m rcation/ranion ratio 0.155 國立成功大學地球科學系 礦物學(一) 江威德 國立成功大學地球科學系 礦物學(一) 江威德 礦物學(一)_江威德_Lecture 12 4 國立成功大學地球科學系 2009/11/24 Pauling’s Rules Ideal Ideal ranges of radius ratio for common coordinations. 國立成功大學地球科學系 礦物學(一) 江威德 Could have a radius ratio greater than the value for a specific coordination but that does not fulfill the principle to reach a maximum coordination state. 國立成功大學地球科學系 礦物學(一) 江威德 礦物學(一)_江威德_Lecture 12 5 國立成功大學地球科學系 2009/11/24 Pauling’s Rules 國立成功大學地球科學系 礦物學(一) 江威德 Cuprite Cu+2O 赤銅礦;Carbonate [CO3]2-;Nitrate [NO3]-; Silicate [SiO4]4-;Cooperite (Pt,Pd,Ni)S 硫鉑礦; Millerite NiS 針硫鎳礦;Halite NaCl 岩鹽;Molybdenite MoS2 輝鉬礦; 國立成功大學地球科學系 Scheelite CaWO4白鎢石;Fluorite CaF2 螢石 礦物學(一) 江威德 礦物學(一)_江威德_Lecture 12 6 國立成功大學地球科學系 2009/11/24 Pauling’s Rules Radius ratios of oxides as examples for Pauling’s 1st rule 國立成功大學地球科學系 礦物學(一) 江威德 More examples…. w/ appropriate coordination numbers 國立成功大學地球科學系 礦物學(一) 江威德 礦物學(一)_江威德_Lecture 12 7 2009/11/24 Pauling’s Rules 國立成功大學地球科學系 NaCl structure CN = 6 CN = 6 0.74/1.81 = 0.41 1.02/1.81 = 0.56 CN = 6 1.38/1.81 = 0.76 CN = 6 1.52/1.81 = 0.84 NaCl 1.61/1.81 = 0.89 1.74/1.81 = 0.96 CN = 8 CN = 8 CsCl strutcure CsCl 國立成功大學地球科學系 礦物學(一) 威德 NaCl Halite 岩鹽 rNa (CN = 6)/rCl (CN = 6) = 1.02Å /1.81Å = 0.56 CaF2 Fluorite 螢石 rCa (CN = 8)/rF (CN = 4) = 1.12Å /1.31Å = 0.85 ZnS Sphalerite 閃鋅礦 rZn (CN = 4)/rS (CN = 4) = 0.60Å /1.84Å = 0.33 國立成功大學地球科學系 礦物學(一) 江威德 礦物學(一)_江威德_Lecture 12 8 2009/11/24 Pauling’s Rules 國立成功大學地球科學系 Rule 2: The electro...
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