A-15型超導(dǎo)體臨界溫度的新經(jīng)驗公式
A NEW EMPIRICAL FORMULA FOR CALCULATING THE TRANSITION TEMPERATURES OF A-15 SUPERCONDUCTORS
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摘要: 正 (一)引言 超導(dǎo)現(xiàn)象早在1911年就發(fā)現(xiàn)了,但作為一門新技術(shù)應(yīng)用于不同領(lǐng)域,還只是本世紀60年代以后的事情。但是超導(dǎo)技術(shù)在最近十幾年內(nèi)的發(fā)展是迅速的。超導(dǎo)體在許多科學(xué)領(lǐng)域,特別是在托克馬克聚變動力堆和超導(dǎo)輸電等電工、電子技術(shù)方面已經(jīng)或?qū)⒌玫綉?yīng)用。因此,超導(dǎo)技術(shù)近年來得到各國科學(xué)工作者的廣泛重視。 臨界溫度是超導(dǎo)體重要性能之一。關(guān)于高溫超導(dǎo)體的臨界溫度的變化規(guī)律,已有不
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Abstract: A new empirical formula for calculating the Tc, of A-15 supereonductors is presented and it reads: Tc=N TA/M1/2(rA/rB) (e/a), where Nnumber of atoms,N = 4 for A3B compounds; TA the superconductive transition temperature of the A element; Mthe. average atomic weight of the compounds; (rA/rB) theatomic radius ratio of elements A and B; (e/a) the eleetron concentration (electrens/atoms). Using the new empirical formula, the supereonductive transition temperatures of A-15 compounds have been calculated, and the results are shown in table 1. As shown in the table the calculated results are much closer to the experimental results than those obtained by other empirical formulas. The highest Tc value of A-15 structural materials may be not higher than 25K. -
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