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[en] A comprehensive analysis of the available papers dealing with the experimental studies of isotopic exchange impact on the critical temperature in high-temperature superconductors is presented. The analysis includes methods of the isotope-enriched samples preparation, isotopic enrichment measuring and the critical temperature shift due to the isotopic effect. Data on this temperature shift value are presented and interpreted for (La,Me)2CuO4, LnBa2Cu3O(7-x), Bi-Sr-Ca-Cu-O, Ba(Pb,Bi)O3 and (Ba,K)BiO3. Some experiments are proposed that could provide explanations for the origin of the critical temperature isotopical shift in high-temperature superconductors. 65 refs.; 3 figs
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International Centre for Scientific and Technical Information (ICSTI), Moscow (USSR); OBZORY po vysokotemperaturnoj sverkhprovodimosti; (no.1); 156 p; 1990; p. 39-80; ICSTI; Moscow (USSR); ISSN 0868-6335; 