The magnetic properties of polycrystalline samples of isotopically enriched iron with the content of isotope 56 Fe 99.945±0.002 at. % were investigated. The samples of monoisotopic iron were preliminarily melted in the environment of argon and annealed in hydrogen. For the sake of comparison the same measurements were carried out on the samples of iron with natural isotopic composition. The quantity and composition of impurities in the samples of natural and monoisotopic iron were equal. The measurements were conducted by the method of vibration magnetometry with the use of the method of automatic vibro-magnetometer VSM-250 (China) using IDAW-2000D VSM test software as well as by induction-pulse method with the use of automated measuring set МK-3E (the Russia) with automatic processing of the obtained data according to GOST 8.377-80 and GOST 12119.1-98. It was found that the value of saturation intensity Js in 56 Fe is by 4.6% higher than in nat Fe. There is actually no difference in saturation intensity Bs of monoisotopic 56 Fe and natural iron within the error in limits of detection of analysis. The difference in the values of coercitive force Нс, residual magnetic induction Br and maximum magnetic permittivity µmax in natural iron and 56 Fe can be explained by the difference in structure and content of impurities in the studied samples.
It is reported on production of germanium stable isotopes 72 Ge, 73 Ge, 74 Ge, 76 Ge single crystals with high isotopic and chemical purity by hydride method. Separation of isotopes was carried out by centrifugal method using monogermane as the initial volatile substance. Samples of monoisotopic monogermanes 72 GeH 4 , 73 GeH 4 , 74 GeH 4 , 76 GeH 4 were purified by the method of low-temperature rectification. Elementary polycrystalline germanium was extracted by pyrolysis from respective monogermane and purified from impurities by the method of zone melting. Single crystals of germanium isotopes were grown by Czochralski method. The content of the main isotope in the produced single crystals 72 Ge, 73 Ge, 74 Ge, 76 Ge was 99.98; 99.90; 99.93 and 87.5 at. %, respectively, and the content of the impurities of stable elements was less than 10 −5 -10 −6 mass %.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.