検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Dry synthesis of brannerite (UTi$$_{2}$$O$$_{6}$$) by mechanochemical treatment

メカノケミカル処理によるブラネライト(UTi$$_{2}$$O$$_{6}$$)の乾式合成

秋山 大輔*; 三島 大輝*; 岡本 芳浩  ; 桐島 陽*

Akiyama, Daisuke*; Mishima, Tomoki*; Okamoto, Yoshihiro; Kirishima, Akira*

UO$$_{2}$$とTiO$$_{2}$$の混合粉末を、タングステンカーバイドバイアルとボールを粉砕媒体として、Ar雰囲気下、遊星ボールミルで1時間メカノケミカル処理した。このようなメカノケミカル(MC)処理により、UO$$_{2}$$とTiO$$_{2}$$の結晶性が低下した。メカノケミカル処理した混合粉末をAr雰囲気下、973-1573Kで6時間加熱し、X線回折分析、走査型電子顕微鏡-エネルギー分散型X線分光分析、X線吸収微細構造分析を行った。1373K以下ではMC処理なしではUTi$$_{2}$$O$$_{6}$$は生成せず、出発物質のみが観測された。1473Kと1573Kでは、それぞれ少量のUTi$$_{2}$$O$$_{6}$$と同量のUTi$$_{2}$$O$$_{6}$$とUO$$_{2}$$が生成した。メカノケミカル処理した試料は、1173K以上で6時間加熱すると、少量のUO$$_{2}$$不純物を含むほぼ純粋なUTi$$_{2}$$O$$_{6}$$が生成した。

A powder mixture of UO$$_{2}$$ and TiO$$_{2}$$ was mechanochemically treated in a planetary ball mill under Ar atmosphere for 1 h using a tungsten carbide vial and balls as the milling medium. Such mechanochemical (MC) treatment reduced the crystallinity of UO$$_{2}$$ and TiO$$_{2}$$. The mechanochemically treated powder mixture was heated at 973-1573K for 6 h under Ar atmosphere and analyzed by X-ray diffraction analysis, scanning electron microscopy-energy-dispersive X-ray spectroscopy, and X-ray absorption fine structure analysis. UTi$$_{2}$$O$$_{6}$$ did not form below 1373K without MC treatment and only the starting materials were observed. At 1473 and 1573K, a small amount of UTi$$_{2}$$O$$_{6}$$ and equal amounts of UTi$$_{2}$$O$$_{6}$$ and UO$$_{2}$$ were formed, respectively. The mechanochemically treated sample produced nearly pure UTi$$_{2}$$O$$_{6}$$ containing small amounts of UO$$_{2}$$ impurities when heated above 1173K for 6 h. UTi$$_{2}$$O$$_{6}$$ was highly crystalline and uniform regardless of the synthesis temperature.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.