NDLI: High-purity silicon isotopes $^{28}$Si, $^{29}$Si, and $^{30}$Si

Content Provider	Springer Nature Link
Author	Gusev, A. V. Bulav, A. D.
Copyright Year	2008
Abstract	The current status of the problem of obtaining high-purity silicon isotopes $^{28}$Si, $^{29}$Si, and $^{30}$Si is analyzed. The scheme of obtaining monoisotopic silicon includes the stages of isotope separation in the form SiF$_{4}$, synthesis and deep purification of isotopically enriched silane, obtaining polycrystalline silicon-28,-29, and-30, and growing monocrystals. The basic problems and methods of their solution in the synthesis and deep purification of silane and obtaining poly-and monocrystals of isotopically enriched silicon are discussed. Data characterizing the achieved level of chemical and isotopic purity of high-purity monocrystals of silicon-28 with a main isotope content of more than 99.99% and silicon-29 and silicon-30 with isotopic purity higher than 99% are presented. In monocrystalline $^{28}$Si, the boron content was 4.5 × 10$^{13}$, the phosphorus content was 5 × 10$^{11}$, the carbon and oxygen contents were <1 × 10$^{16}$ at/cm$^{3}$, and the specific resistance was 800 Ω cm.The results of investigation of heat capacity, heat conduction, photoluminescence, and electron paramagnetic resonance spectra for monoisotopic silicon-28 are presented. The heat conduction of monoisotopic silicon is increased considerably owing to the reduced photon scattering on isotopic inhomogeneities. In the region of 20–30 K, the heat conduction of silicon-28 with an isotopic purity of 99.98% is higher by a factor of 8 than the heat conduction of natural silicon.Investigations of photoluminescence spectra in the magnetic field in the low-temperature region demonstrated the capability of optical detection of nuclear spin states of a phosphorus admixture in high-purity silicon-28. p ]Topical questions for further investigations and possible fields of practical application of high-purity isotopically enriched silicon are discussed.
Starting Page	1395
Ending Page	1408
Page Count	14
File Format	PDF
ISSN	00201685
Journal	Inorganic Materials
Volume Number	44
Issue Number	13
e-ISSN	16083172
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-11-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Industrial Chemistry/Chemical Engineering Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Chemical Engineering Inorganic Chemistry

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