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Local structure analysis of ZrN, and Dy$$_{0.5}$$Zy$$_{0.5}$$N surrogate materials for fast reactor nitride fuel

窒化物模擬燃料物質ZrN, Dy$$_{0.5}$$Zy$$_{0.5}$$Nの局所構造解析

米田 安宏; 辻 卓也; 松村 大樹; 岡本 芳浩; 高木 聖也; 高野 公秀 

Yoneda, Yasuhiro; Tsuji, Takuya; Matsumura, Daiju; Okamoto, Yoshihiro; Takaki, Seiya; Takano, Masahide

窒化物模擬燃料物質のDyNとZrNの結晶構造解析を行った。DyNとZrNの格子ミスマッチは7%近くありながら、Dy$$_{1-x}$$Zr$$_x$$Nは単相の試料が得られ、平均構造の格子定数はVegard則に従う。局所構造解析は放射光X線を利用したXAFSとPDF解析を併用して行ったところ、Zr-Nの原子間距離が平均構造の格子定数のより大きなDy$$_{0.5}$$Zr$$_{0.5}$$NにおいてZrNよりも縮んでいることがわかった。このような局所的なモジュレーションが熱伝導率などの物性に与える影響を検討した。

ZnN is a possible candidate for the diluent material for nitride fuels containing transuranium elements. Pellets of inert matrix material ZrN, and surrogate nitride fuel material Dy$$_{0.5}$$Zr$$_{0.5}$$N, are fabricated for the purpose of investigating the crystal structure. Lattice parameters of Dy$$_{1-x}$$Zr$$_x$$N followed the Vegard's low, in spite of the large lattice mismatch ($$sim$$ 7%) between DyN and ZrN. Local structure analysis was performed by X-ray absorption fine structure (XAFS) and atomic pair-distribution function (PDF) methods. The Zr-N nearest neighbor bond distance changed as changing the Dy composition. The complex local structure of DyN and ZrN is related to the preferable effects of ZrN.

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