Sesion 3 Estructuras_Cristalinas

May 11, 2019 | Author: Esteban Sanchez | Category: Crystal Structure, Crystal, Crystalline Solids, Crystallography, Condensed Matter Physics
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Semana 03 Estructuras cristalinas Estructura cristalina de los sólidos. Posiciones, direcciones direcciones y planos reticulares. 

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ESTRUCTURA CRISTALINA

Material en  estado liquido

Colada en molde

Solidificación -  Metales

Material sólido

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Estructuras Cristalinas Los modelos de estructuras cristalinas a partir de unidades esf!ricas ya habían sido propuestas antes del siglo XVII . Kepler, Hooke y Huygens  fueron algunos de los científicos que sugirieron que los cristales estarían compuestos de en unidades idénticas empaquetadas arreglos tridimensionales.  A partir de estas ideas, Haüy , en el   siglo XVIII , obtuo e!presiones matem"ticas para los "ngulos entre las caras de un cristal, compuesto de un empaquetamiento regular de unidades. Estos "ngulos tuieron gran aplicación en la clasificación de los minerales. #in embargo, las medidas precisas de los parámetros de red  sólo pudieron ser determinadas en el siglo XX   con el adenimiento de ese fant"stico instrumento basado en la difracción de los  rayos X 

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REDES ESPACIALES ESPACIALES Y CELDA UNIDAD #eg'n la distribución espacial de los "tomos, mol(culas o iones, los materiales sólidos pueden ser clasificados en:   Cristalinos% compuestos por "tomos, mol(culas o iones organi&ados de una forma periódica en tres dimensiones. Las posiciones ocupadas siguen una ordenación que se repite para grandes distancias atómicas )de largo alcance*.    Amorfos%  compuestos por "tomos, mol(culas o iones que no presentan una ordenación de largo alcance. +ueden presentar ordenación de corto alcance. Los gases y líquidos, no presentan una cristalinidad o periodicidad en su estructura. Los sólidos, tanto los metales, cer"micos o polímeros pueden o no e!hibirla. E&em'lo% un metal, que normalmente es cristalino, cuando es enfriado de modo e!tremadamente r"pido desde el estado líquido es amorfo )idrio met"lico  es mas duro que el acero y puede doblarse sin romperse - //*. //*. La sílice )#i0 * puede e!istir como idrio amorfo )sílica fundida* o como cristal )cristobalita o tridimita*. 1na característica esencial de un cristal, es la distribución de sus "tomos en forma periódica en las tres dimensiones del

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Estructura cristalina Es el con%unto de puntos regularmente distribuidos de manera tal que cada una de ellas tiene un id(ntico entorno de ecinos. La red de puntos constituye el esqueleto sobre el cual se constituyen las estructuras cristalinas que presentan los sólidos cristalinos. +uede haber un "tomo, ión o mol(cula en cada punto de la red, pero no es imprescindible. +or e%emplo, cada punto de la red puede estar en el centro de un grupo de 2 unidades )"tomos, iones o mol(culas*.

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Estructura cristalina #i definimos la base como un "tomo o con%unto de "tomos, la estructura cristalina queda definida como: "#$ !"IS%&LI& !"IS%&LI& ' B&S# ( #S%")!%)"& !"IS%& !"IS%&LI& LI&

1na base de "tomos est" unida o ligada a todo punto de la red, siendo todas las bases id(nticas en composición, distribución y orientación. La figura muestra cómo se forma una estructura cristalina mediante la adición de una base a todos los puntos de la red:

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Puntos reticulares de una red cristalina en dos dimensiones

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ESTRUCTURA CRISTALINA Es una forma solida, en la que los constituyentes: "tomos, iones o mol(culas3 est"n dispuestos de forma ordenada, con patrón

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Celda unitaria + celda 'rimiti*a 1na cel*a uni+aria, es aquella que llenar" todo el espacio mediante adecuadas repeticiones de operaciones de traslación . Es decir la cel*a uni+aria, es la menor subdiisión de una red geom(trica de puntos que tiene características generales de toda la retícula. La geometría de una cel*a uni+aria puede ser descrita por tres ectores a) 0) y c, llamados ectores base de la red, y por los "ngulos entre ellos 6, 7 y γ . 1n no*o cualquiera )u, , 8*

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SISTEMAS CRISTA CRISTALIN2S LIN2S 3 RE4ES RE4 ES 4E 5RA 5RAAIS AIS 1na red geom(trica de puntos puede ser descrita por la repetición de una celda unitaria conenientemente elegida. El nmero *e cel*as *i-eren+es   con las que puede describir una red tridimensional de puntos es limitado. Los cristalógrafos han demostrado que hay sólo ./ -ormas posi0les *e cel*as  que por sucesias traslaciones pueden generar una red. Estas ./ re*es geom1+ricas  pueden sime+r2as 3 sis+emas re+iculares. =ada celda de estos > sistemas se

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Clasi!caci"n de ret#culos espaciales de en sistemas cristalinos Sistemas cristalinos

Lon1itudes a6iales + án1ulos intera6iales

Bravais

Retículos es'aciales

C/0ico

8 e&es i1uales) en án1ulos rectosa 9 0 9 c) 9  9  9 #:;

C/0ico sim'le o 'rimiti*a C/0ico centrado en el cuer'o C/0ico centrado en las caras

Tetra1onal

8 e&es en án1ulos rectos) dos de ellos i1uales-

Tetra1onal Tetra1onal sim'le o 'rimiti*a

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ES$RUC$URA DE L%S &E$ALES Los metales en 'eneral se cristali(an en las estructuras CC) *CC +

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