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Related Experiment Video

Updated: Jun 19, 2026

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

U₂O₅ Film Preparation via UO₂Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

Cs(2)K(UO)(2)Si(4)O(12): a mixed-valence uranium(IV,V) silicate.

Cheng-Shiuan Lee¹, Sue-Lein Wang, Kwang-Hwa Lii

¹Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC.

Journal of the American Chemical Society

|October 8, 2009

Summary

Scientists synthesized the first mixed-valence uranium silicate using high-temperature, high-pressure hydrothermal methods. This novel material features a unique 3-D framework of uranium and silicon-oxygen polyhedra.

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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

U₂O₅ Film Preparation via UO₂Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Area of Science:

Materials Science
Inorganic Chemistry
Geochemistry

Background:

Mixed-valence compounds offer unique electronic and magnetic properties.
Uranium silicates are relevant in nuclear waste management and geochemistry.
Previous synthesis of mixed-valence uranium silicates under hydrothermal conditions was limited.

Purpose of the Study:

To synthesize and characterize the first mixed-valence uranium(IV,V) silicate.
To elucidate the crystal structure and bonding of this novel compound.
To confirm the uranium valence states within the synthesized material.

Main Methods:

High-temperature, high-pressure hydrothermal synthesis.
Single-crystal X-ray diffraction for structural determination.
X-ray Photoelectron Spectroscopy (XPS) and X-ray Absorption Near Edge Structure (XANES) for valence state analysis.

Main Results:

Successful synthesis of a novel mixed-valence uranium(IV,V) silicate.
Determination of a 3-D framework structure composed of corner-sharing U(IV,V)O(6) octahedra interconnected by Si(4)O(12) rings.
XPS and XANES spectra confirmed the co-existence of uranium(IV) and uranium(V) oxidation states.

Conclusions:

The study reports the first synthesis of a mixed-valence uranium silicate.
The unique 3-D framework structure provides insights into uranium coordination chemistry.
This material could have implications for understanding uranium behavior in geological environments and nuclear materials.