U-Pt-Sm-Ba-O chemical pinning centers in Ag-doped Sm123 textured in reduced oxygen

Ravi Persad Sawh, Roy Weinstein, Drew Parks, Noriko Chikumoto, Masato Murakami

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

In the U/n process enriched uranium is admixed to HTS powders, textured and then irradiated with thermal neutrons. Neutrons must penetrate several centimeters for such processing to be successful in textured materials. Bulk Sm123 cannot be U/n processed because thermal neutrons penetrate <1 mm. However, textured Sm123 can still benefit from chemical pinning centers that are formed during U/n processing. Thin or thick films of Sm123 can still be successfully U/n processed. In the present work, powders containing Ag2O + 20 mol% Sm211 + Sm123 + Pt are doped with depleted U, and textured in a 1% oxygen atmosphere. Microstructure studies indicate the presence of small deposits of (U0.5Pt0.5)SmBa2O6, which are double perovskites. Important characteristics of the U-Pt-Sm-Ba-O particles are: (a) average size is 500 nm, (b) distribution is fairly uniform within the Sm123, (c) the number of deposits is proportional to the mass of admixed U (i.e., size is constant for increasing doping levels) (d) U does not substitute into the background Sm123, (e) Ag does not interact with either U or Pt, and (f) there is less coarsening of the U-rich particles when the dwell time of the maximum temperature in the temperature versus time profile is <2 hours. The U-Pt-Sm-Ba-O deposits are strikingly similar to the U-Pt-Y-Ba-O deposits found earlier in U-doped Y123. Tungsten or molybdenum can be used as nonradioactive substitutes for uranium to produce similar double perovskites deposits.

本文言語English
ページ(範囲)3151-3154
ページ数4
ジャーナルIEEE Transactions on Applied Superconductivity
13
2 III
DOI
出版ステータスPublished - 2003 6
外部発表はい
イベント2002 Applied Superconductivity Conference - Houston, TX, United States
継続期間: 2002 8 42002 8 9

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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