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huanhuan00金虫 (小有名气)
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[求助]
1molNaCl中有多少个NaCl的单胞 已有1人参与
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| 1molNaCl中有多少个NaCl的单胞,如何求得的? |
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xhtangxh
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huanhuan00: 金币+5 2013-12-22 14:08:55
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huanhuan00: 金币+5 2013-12-22 14:08:55
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这个要看你指定的单胞是哪一种晶相的啦。NaCl可以查到有两种晶相: 1. Card Information Names: Sodium Chloride Halite, syn Formula: Na Cl PDF Number: 5-628 Quality: star Subfiles: inorganic mineral CP EDU FOR NBS PHR Cell and Symmetry Information System: cubic Space Group: Fm-3m (no. 225) a: 5.6402 Density (Dm): 2.168 Density (Dx): 2.164 Z: 4 Instrument Information Radiation: CuKa1 Wavelength: 1.5405 Filter: Ni Instrument(d): unknown Instrument(I): diffractometer I type: unknown I/Icor: 4.40 Comments and Additional Information General: An ACS reagent grade sample recrystallized twice from hydrochloric acid. Temperature: Pattern taken at 26 C. Optical: B=1.542 Colour: Colorless Melting Point: 804 degrees Pattern: See ICSD 18189 (PDF 01-072-1668). Literature References General: Swanson, Fuyat. Natl. Bur. Stand. (U.S.), Circ. 539 II 41 (1953) Optical: Dana's System of Mineralogy, 7th Ed. II 4 ( ) 2. Card Information Names: Sodium Chloride Sodium chloride - HP Formula: Na Cl PDF Number: 89-2780 Quality: calculated Subfiles: inorganic FIZ PHR Cell and Symmetry Information System: cubic Space Group: Pm-3m (no. 221) a: 3.36000 Density (Dx): 2.558 Z: 1 Instrument Information Radiation: CuKa1 Wavelength: 1.54060 Instrument(d): calculated Cut Off: 17.7 Instrument(I): calculated I type: peak heights I/Icor: 6.38 Comments and Additional Information ICSD Number: 043434 RM REM PRE 17.6 kbar. RM REM M After 20 h 8% was transformed from Fm3-m. TT No R value given. TT At least one TF missing. TI Polymorphic transitions in Na Cl WY b a (PM3-M) AF AX Literature References General: Calculated from ICSD using POWD-12++ ( ) Structure: Evdokimova, V.V., Verashchagin, L.F. Fiz. Tverd. Tela (Leningrad) 4 1965 (1962) 正常情况下NaCl是以第1种晶相存在的,每个单胞含4个NaCl,1mol NaCl理论上含6.022e+23个NaCl,有多少个单胞就不用我算了吧。如果是以第2种晶相(高压相)存在,每个单胞则只含1个NaCl. 最近还发现氯化钠在高压冲击条件下可形成Na3Cl和NaCl3: http://www.sciencemag.org/content/342/6165/1459.full http://www.sciencemag.org/content/342/6165/1502.full |
2楼2013-12-22 11:32:02
huanhuan00
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3楼2013-12-22 14:08:32













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