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田端 千紘; 白崎 謙次*; 酒井 宏典; 砂賀 彩光*; Li, D.*; 小中 真理子*; 山村 朝雄*
CrystEngComm (Internet), 24(19), p.3637 - 3648, 2022/05
被引用回数:2 パーセンタイル:29.71(Chemistry, Multidisciplinary)Hydrothermal reactions of uranium(IV) nitrate solutions in the presence of aldehydes yielded microparticles of UO, at temperatures as low as 100
C. The synthesized products contained residual organic matter originating from aldehydes used as an additive, unless the synthesis temperature was 390
C. Additionally, the residual matter could be separated from the product by heat treatment at
300
C. The valence of uranium ions in the UO
products was found to be higher than that reported for UO
. Low synthesis temperatures resulted in the suppression of the magnetic moments of uranium ions and the occurrence of the spin interaction among the ions. Therefore, the oxidation number of uranium averaged over the entire product could become higher than 4+. A comparative study with ThO
suggested that the redox reaction could be closely related to the hydrothermal synthesis reaction and particle growth of UO
.
田端 千紘*; 白崎 謙次*; 砂賀 彩光*; 酒井 宏典; Li, D.*; 小中 真理子*; 山村 朝雄*
CrystEngComm (Internet), 23(48), p.8660 - 8672, 2021/12
被引用回数:7 パーセンタイル:63.20(Chemistry, Multidisciplinary)超臨界水下においてウラン酸化物UOの水熱合成について調べた。得られたUO
粒子について、その化学組成,結晶形,サイズ,均一性などを調べた結果、超臨界水熱合成法は、化学的に制御された均一なUO
を合成するのに有効である可能性がある。
松川 健*; 飯田 一樹*; 中村 充孝; 石垣 徹*
CrystEngComm (Internet), 23(12), p.2355 - 2359, 2021/03
被引用回数:4 パーセンタイル:42.70(Chemistry, Multidisciplinary)Neutron powder diffraction analysis revealed that ceria transformed into the oxyhydroxide structure by hydrogen treatment. Due to detection of the vibrational modes of both OH and CeH functional groups by inelastic neutron scattering measurements, the CeH functional group was revealed to possibly exist in ceria as an aperiodic structure.