2014年9月1日 · The PXRD studies confirm the formation of U 3 O 8 as end product during the decomposition of ammonium diuranate. From our studies, it is suggested that ammonium diuranate decomposes to tri uranium octaoxide (U 3 O 8) through evolution of nitrogen, hydrogen and oxygen, and not through ammonia evolution in the literature.

2018年9月1日 · Crystallographic changes to UO 2 and α-U 3 O 8 were quantified using powder X-ray diffractometry (p-XRD). In total, 108 samples were analyzed to build the DOE model on aging between 2 and 48 h, temperatures from 100 °C to 400 °C, and partial pressures of O2 from ∼0.0 kPa to 21.3 kPa.

2005年1月27日 · Calcination of such systems to 1073 K results in extensive extrusion of the supported uranium phase from mesoporous supports, resulting in the formation of very large orthorhombic U 3 O 8 domains. PXRD, however, shows that on amorphous SiO 2 and γ-Al 2 O 3 similar treatment results in the formation of a hexagonal phase of U 3 O 8.

Download scientific diagram | p-XRD spectra comparison of α-U 3 O 8 from the UO 4 synthetic route. The spectrum representative of the unaged control is shown at the top of the graph, followed...

Five separate calcination temperatures were used to synthesize α-U3O8 and each sample was characterized using powder X-ray diffraction (p-XRD) and Scanning Electron Microscopy (SEM).

2022年2月22日 · Triuranium octoxide (U 3 O 8) is one of the main compounds in the nuclear fuel cycle. As such, identifying its processing parameters that control the oxygen isotopic composition could be developed as a new signature for nuclear forensic investigation.

Download scientific diagram | PXRD data obtained from UAlBO-1 after heating to high temperatures (peaks of U3O8 are marked by *) from publication: Synthesis of Uranium Materials under Extreme...

使用粉末 X 射线衍射 (p-XRD) 验证每个样品的纯度，并收集扫描电子显微镜 (SEM) 图像以识别独特的形态特征。 发现来自 ADU 和 UO4 的 U3O8 是独一无二的。 定性地说，这两种颗粒具有相似的特征，主要是圆形。 使用材料形态分析 (MAMA) 软件，对颗粒形状和尺寸进行量化。 发现 UO4 产生的 U3O8 颗粒是 ADU 产生的颗粒面积的三倍。 随着起始形态的量化，来自 ADU 和 UO4 的 U3O8 样品以已知数量物理混合。 收集混合样品的 SEM 图像，并使用 MAMA 软件量化颗粒属 …

This study focuses on the isotope signature change resulting from the manufacturing processes of U3O8 under di fferent temperatures, calcination times, cooling rates, and initial solutions. We synthesized U3O8 originating from various UNH and UO3, via several processes commonly used in the uranium nuclear fuel cycle.

Carbon content has been determined quantitatively using TG and FTIR techniques and the results are in good agreement. Ammonium nitrate was found as impurity in ammonium diuranate matrix. The PXRD studies confirm the formation of U3O8 as end product during the decomposition of ammonium diuranate.