SYNTHESIS OF REFRACTORY MIXED OXIDE WITH PEROVSKITE STRUCTURE. Bi-monthly Report No. 2 for the Period July 24, 1960 to September 24, 1960

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Experimental work on the preparation and measurement of BaThO/sub 3/ shows that the compound exists and is the most stable compound in the Ba-Th-O system. It is cubic at ordinary temperature, with the perovskite structure, and has a crystal density of 4.59 g/cc. The compound may be prepared from a coprecipitated mixture of the barium and thorium oxalates at 750 deg C, and the reaction is driven to completion below 1000 deg C in the presence of an excess of barium. BaThO/sub 3/ appears to hydrolyze readily in the presence of moisture and/or CO/sub 2/. It does not, therefore, appear ... continued below

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Pages: 11

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Harada, Y. & Bradstreet, S.W. October 31, 1961.

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Description

Experimental work on the preparation and measurement of BaThO/sub 3/ shows that the compound exists and is the most stable compound in the Ba-Th-O system. It is cubic at ordinary temperature, with the perovskite structure, and has a crystal density of 4.59 g/cc. The compound may be prepared from a coprecipitated mixture of the barium and thorium oxalates at 750 deg C, and the reaction is driven to completion below 1000 deg C in the presence of an excess of barium. BaThO/sub 3/ appears to hydrolyze readily in the presence of moisture and/or CO/sub 2/. It does not, therefore, appear to have the chemical stability required in a protective coating, and it is inadvisable to measure other coating parameters at this time. It may, however, serve as a superior thermionic emitter. (auth)

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Pages: 11

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  • Other Information: Orig. Receipt Date: 31-DEC-61

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  • Report No.: ARF-6046-2
  • Grant Number: None
  • DOI: 10.2172/4121667 | External Link
  • Office of Scientific & Technical Information Report Number: 4121667
  • Archival Resource Key: ark:/67531/metadc870976

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  • October 31, 1961

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  • Sept. 16, 2016, 12:32 a.m.

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Harada, Y. & Bradstreet, S.W. SYNTHESIS OF REFRACTORY MIXED OXIDE WITH PEROVSKITE STRUCTURE. Bi-monthly Report No. 2 for the Period July 24, 1960 to September 24, 1960, report, October 31, 1961; Country unknown/Code not available. (digital.library.unt.edu/ark:/67531/metadc870976/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.