Variació de les propietats dels materials amb la temperatura (1)
1) Superconductivitat
Una mica de teoria (Què és un superconductor?)
Tenim una peça d’un material ceràmic que anomenem YBCO (de composició YBa2Cu3O7) que presenta propietats metàl·liques a temperatura ambient però per sota de l’anomenada temperatura crítica (Tc) de 80 K (-196 ºC) en aquest cas, presenta superconductivitat.
Els superconductors presenten dues característiques notables:
1. Per sota de la temperatura crítica (Tc) a la que es forma l’estat superconductor, la seva resistència elèctrica és nul·la.
2. També per sota de la Tc presenta l’efecte Meissner o d’exclusió d’un camp magnètic. De manera que al col·locar un imant sobre el material superconductor podem observar que el primer levita i gira lliurement, sobre la peça ceràmica, sense cap més resistència que la de l’aire.
Una mica més de teoria (N2 líquid, molt fred)
L’aire que respirem està format bàsicament per 2 gasos, en una proporció aproximada de 78/21. El 21 % de l’aire és O2, mol·lècula indispensable per a la nostra vida i la gran part de l’aire que respirem (un 78 %) és N2. L’1 % restant està format per altres compostos (alguns dels quals val més no recordar que els respirem).
Ara ja sabem que a temperatura ambient el N2 és gasós, però què passa concretament a -196 ºC? A aquesta temperatura el N2 es troba en estat líquid. El N2 líquid el conservem en un calorímetre, un recipient les parets del qual redueixen molt l’intercanvi de calor entre l’exterior i l’interior d’ell mateix, impedint així que el N2 líquid s’evapori massa ràpidament (hem de tenir en compte que el calorímetre, ple de N2 líquid a -196 ºC, es troba submergit en l’aire que considerant que està a la temperatura ambient de 20º C, tenim un gradient tèrmic de quasi 220º C!).
Com a curiositat cal dir que a l’obrir el calorímetre podem observar una boira que sembla sortir del recipient ple de N2. No és més que H2O líquida (finíssimes gotetes, tal com la boira que es forma els matins d’hivern per condensació del vapor d’H2O atmosfèric per les baixes temperatures nocturnes) provinent de la condensació del vapor d’H2O que es troba a l’aire (només condensa el vapor d’H2O més proper al N2 líquid.)
Mireu el nostre vídeo de generació de boira
Experiment
- Omplim una càpsula de petri amb N2 líquid.
- Introduïm la peça ceràmica (YBCO) a la càpsula de petri, submergint-la així en el N2 i, per tant, refredant-la per sota de la seva temperatura crítica.
- Finalment dipositem l’imant sobre el superconductor ceràmic observant que l’imant no toca la superfície del superconductor, sinó que levita per sobre d’ell i s’hi manté, per l’efecte (comentat a la teoria) Meissner.
- En la càpsula de petri el N2 líquid no està ben aïllat tèrmicament, de manera que es va evaporant. Això provoca que el material ceràmic vagi pujant de temperatura fins que supera la seva temperatuta crítica, es perden les propietats de superconductor i l’imant deixa de levitar, caient per efecte de la gravetat sobre la peça ceràmica.
Mireu el nostre vídeo de la levitació d’un imant sobre un superconductor
Comments
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