Effects of temperature and microstructure on the elastic properties of selected Eu$sub 2$O$sub 3$-HfO$sub 2$ compositions

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Europium oxide is presently being tested for use as the control material in future nuclear power reactors. Elastic properties of europia and selected europia-rich compositions of the europia-hafnia system were investigated. The sonic technique was employed to measure elastic moduli from room temperature to 1500$sup 0$C. Sintered monoclinic europia specimens were found to have uncommonly low room temperature moduli values and to exhibit hysteresis between heating and cooling curves because of the presence of microcracks caused by thermal expansion anisotropy. Fine grained hot pressed europia as well as sintered specimens that contained at least 6 mole percent hafnia did not ... continued below

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Pages: 101

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Suchomel, R.R. October 1, 1975.

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  • Ames Laboratory
    Publisher Info: Ames Lab., Iowa (USA)
    Place of Publication: [Ames,] Iowa

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Europium oxide is presently being tested for use as the control material in future nuclear power reactors. Elastic properties of europia and selected europia-rich compositions of the europia-hafnia system were investigated. The sonic technique was employed to measure elastic moduli from room temperature to 1500$sup 0$C. Sintered monoclinic europia specimens were found to have uncommonly low room temperature moduli values and to exhibit hysteresis between heating and cooling curves because of the presence of microcracks caused by thermal expansion anisotropy. Fine grained hot pressed europia as well as sintered specimens that contained at least 6 mole percent hafnia did not exhibit these characteristics. Photomicrographs revealed that grain growth suppression was produced by and related to the amount of hafnia introduced. Hysteresis loops in the moduli versus temperature measurements were exhibited only by those specimens for which the average grain size was in excess of a critical value of 8 $mu$m. Dilatometer measurements indicated that thermal expansion was relatively constant over the compositional range of interest. (auth)

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Pages: 101

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Dep. NTIS

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  • Other Information: Thesis. Orig. Receipt Date: 30-JUN-76

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  • Report No.: IS-T--678
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/4190874 | External Link
  • Office of Scientific & Technical Information Report Number: 4190874
  • Archival Resource Key: ark:/67531/metadc879932

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  • October 1, 1975

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  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 26, 2017, 7:13 p.m.

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Suchomel, R.R. Effects of temperature and microstructure on the elastic properties of selected Eu$sub 2$O$sub 3$-HfO$sub 2$ compositions, thesis or dissertation, October 1, 1975; [Ames,] Iowa. (digital.library.unt.edu/ark:/67531/metadc879932/: accessed August 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.