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boletin1 - F sica del Estado Slido o Relacin de problemas o...

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ısica del Estado S´olido Relaci´on de problemas Problemas de F´ ısica del Estado S´olido. Bolet´ ın N o 1 1. El Cs posee una estructura c´ubica centrada en el interior con base monoat´omica. Si se sustituyen los ´ atomos de Cs situados en el centro de los cubos por ´ atomos de Tl se obtiene una aleaci´on de Cs y Tl. Determine su composici´on, red cristalina y coordenadas de la base. 2. Compruebe que los ´unicos ejes de simetr´ ıa de rotaci´on compatibles con la simetr´ ıa de traslaci´on son de orden 1 , 2 , 3 , 4 y 6 . 3. Demuestre que en un cristal c´ubico la fila reticular [ hkl ] es perpendicular a la familia de planos paralelos de ´ ındices de Miller ( hkl ) . 4. Si los vectores a j ( j = 1 , 2 , 3 , ) definen la celda primitiva de una cierta red, determine la condici´on que deben satisfacer los vectores a i = S ij a j ( i = 1 , 2 , 3 , ) para que tambi´ en sean vectores primitivos de la misma red. 5. Determ´ ınese la red rec´ ıproca de un cristal cuya red directa es c´ubica centrada en las caras de par´ ametro a . 6. Calc´ulese la m´ axima fracci´on del volumen total de un cristal que pueden ocupar los ´ atomos, considerados como esferas dura, en las tres redes c´ubicas. 7. El C cristaliza en dos formas alotr´opicas diferentes: diamante y grafito. El diamante cristaliza en un sistema c´ubico de par´ ametro a = 3 , 57 ˚ A y el grafito en el hexagonal con par´ ametros a = 2 , 46
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  • Spring '08
  • WORMER
  • Sistema Internacional de Unidades, Sistema de coordenadas, Gases nobles, Fuerzas de Van der Waals, Cristalografía de rayos X

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