High-Pressure Phase Transition to the Gd2S3 Structure in Sc2O3: A New Trend in Dense Structures in Sesquioxides

详细信息    查看全文

• 作者：Hitoshi Yusa ; Taku Tsuchiya ; Nagayoshi Sata ; Yasuo Ohishi
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：August 17, 2009
• 年：2009
• 卷：48
• 期：16
• 页码：7537-7543
• 全文大小：904K
• 年卷期：v.48,no.16(August 17, 2009)
• ISSN：1520-510X

文摘

In situ X-ray diffraction experiments using a laser-heated diamond anvil cell revealed a novel dense phase with the Gd₂S₃ structure stabilizing in Sc₂O₃ at pressures over 19 GPa. Although no phase transformation was induced during room-temperature compression up to 31 GPa, the C rare earth sesquioxide structure transformed into the B rare earth sesquioxide structure at 10 GPa after laser annealing and subsequently into the Gd₂S₃ structure at 19 GPa. Neither the A rare earth sesquioxide structure nor the U₂S₃ structure was found in Sc₂O₃. Static density functional lattice energy calculations demonstrated that the C structure prefers Gd₂S₃ over U₂S₃ as the post phase. Sc₂O₃ is the second sesquioxide, after In₂O₃, to crystallize into a Gd₂S₃ structure at high pressures and high temperatures.