Measurement of the heat of α → β transformation of plutonium under pulsed volumetric heating of samples in Yaguar pulsed nuclear reactor.
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| Title: | Measurement of the heat of α → β transformation of plutonium under pulsed volumetric heating of samples in Yaguar pulsed nuclear reactor. |
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| Authors: | Kordyukov, V.1 btk@five.ch70.chel.su, Lyasota, A.1 |
| Source: | High Temperature. Apr2009, Vol. 47 Issue 2, p206-210. 5p. 1 Diagram, 1 Chart, 2 Graphs. |
| Subjects: | Plutonium, Transuranium elements, Irradiation, Electric resistance, Electric impedance, Neutrons |
| Abstract: | The paper describes the procedure and results of measurement of one of the basic properties of unalloyed plutonium, namely, the heat of α → β transformation. The measurements are performed under conditions of unsteady-state volumetric heating of plutonium in the process of neutron irradiation of samples in a pulsed nuclear reactor (PNR). The experiments are aimed at determining the preassigned degree of phase transformation (PT) of plutonium by the variation of electric resistance of sample measured at one and the same temperature of ∼100 °C in the state of α phase prior to neutron irradiation and in the state of metastable β phase after neutron irradiation, completion of α → β transformation, and cooling down to this temperature of measurement. The desired degree of PT is attained in the process of pulsed volumetric heating of plutonium under neutron irradiation of sample in the channel of the core of Yaguar PNR. The value of fission energy of plutonium nuclei released in the sample is determined by measuring the absolute heating of the working medium of the monitor-detector made of plutonium dioxide and the relative activity of indicators made of uranium-235 oxide and located on the working sample and on the monitor-detector. The results of measurement of energy input and of respective variation of electric resistance due to heating and to partial or complete α → β transformation of plutonium in a sequence of experiments with neutron irradiation of sample in the PNR are used for constructing the dependence of variation of electric resistance of sample on energy input. This dependence is linear in the range of values of measured parameters corresponding to α → β transformation of plutonium. The slope of straight line reflects the ratio of variation of electric resistance in the case of phase transformation to the heat of α → β transformation. It follows from the experimentally measured slope and value of variation of electric resistance in the case of complete phase transformation that the heat of α → β transformation is Δ Hαβ = 3.35 ± 0.1 kJ/mol, which agrees well with the adopted reference value of Δ Htr = 3.45 ± 0.08 kJ/mol. [ABSTRACT FROM AUTHOR] |
| Copyright of High Temperature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Measurement of the heat of α → β transformation of plutonium under pulsed volumetric heating of samples in Yaguar pulsed nuclear reactor. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kordyukov%2C+V%2E%22">Kordyukov, V.</searchLink><relatesTo>1</relatesTo><i> btk@five.ch70.chel.su</i><br /><searchLink fieldCode="AR" term="%22Lyasota%2C+A%2E%22">Lyasota, A.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22High+Temperature%22">High Temperature</searchLink>. Apr2009, Vol. 47 Issue 2, p206-210. 5p. 1 Diagram, 1 Chart, 2 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Plutonium%22">Plutonium</searchLink><br /><searchLink fieldCode="DE" term="%22Transuranium+elements%22">Transuranium elements</searchLink><br /><searchLink fieldCode="DE" term="%22Irradiation%22">Irradiation</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+resistance%22">Electric resistance</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+impedance%22">Electric impedance</searchLink><br /><searchLink fieldCode="DE" term="%22Neutrons%22">Neutrons</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The paper describes the procedure and results of measurement of one of the basic properties of unalloyed plutonium, namely, the heat of α → β transformation. The measurements are performed under conditions of unsteady-state volumetric heating of plutonium in the process of neutron irradiation of samples in a pulsed nuclear reactor (PNR). The experiments are aimed at determining the preassigned degree of phase transformation (PT) of plutonium by the variation of electric resistance of sample measured at one and the same temperature of ∼100 °C in the state of α phase prior to neutron irradiation and in the state of metastable β phase after neutron irradiation, completion of α → β transformation, and cooling down to this temperature of measurement. The desired degree of PT is attained in the process of pulsed volumetric heating of plutonium under neutron irradiation of sample in the channel of the core of Yaguar PNR. The value of fission energy of plutonium nuclei released in the sample is determined by measuring the absolute heating of the working medium of the monitor-detector made of plutonium dioxide and the relative activity of indicators made of uranium-235 oxide and located on the working sample and on the monitor-detector. The results of measurement of energy input and of respective variation of electric resistance due to heating and to partial or complete α → β transformation of plutonium in a sequence of experiments with neutron irradiation of sample in the PNR are used for constructing the dependence of variation of electric resistance of sample on energy input. This dependence is linear in the range of values of measured parameters corresponding to α → β transformation of plutonium. The slope of straight line reflects the ratio of variation of electric resistance in the case of phase transformation to the heat of α → β transformation. It follows from the experimentally measured slope and value of variation of electric resistance in the case of complete phase transformation that the heat of α → β transformation is Δ Hαβ = 3.35 ± 0.1 kJ/mol, which agrees well with the adopted reference value of Δ Htr = 3.45 ± 0.08 kJ/mol. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of High Temperature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1134/S0018151X09020096 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 5 StartPage: 206 Subjects: – SubjectFull: Plutonium Type: general – SubjectFull: Transuranium elements Type: general – SubjectFull: Irradiation Type: general – SubjectFull: Electric resistance Type: general – SubjectFull: Electric impedance Type: general – SubjectFull: Neutrons Type: general Titles: – TitleFull: Measurement of the heat of α → β transformation of plutonium under pulsed volumetric heating of samples in Yaguar pulsed nuclear reactor. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kordyukov, V. – PersonEntity: Name: NameFull: Lyasota, A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 0018151X Numbering: – Type: volume Value: 47 – Type: issue Value: 2 Titles: – TitleFull: High Temperature Type: main |
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