Crystal structure of HgGa₂Se₄ under compression

详细信息    查看全文

• 作者：Oscar Gomis^a ; ^{osgohi@fis.upv.es} ; Rosario Vilaplana^a ; Francisco Javier Manjó ; n^b ; David Santamarí ; a-Pé ; rez^c ; ^d ; Daniel Errandonea^d ; Eduardo Pé ; rez-Gonzá ; lez^e ; Javier Ló ; pez-Solano^e ; Plá ; cida Rodrí ; guez-Herná ; ndez^e ; Alfonso Muñ ; oz^e ; Ion Mihail Tiginyanu^f ; Veaceslav Vladimir Ursaki^f
• 关键词：61.05.cp ; 61.50.Ks ; 62.50.&minus ; p ; 64.70.kg
• 刊名：Materials Research Bulletin
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：48
• 期：6
• 页码：2128-2133
• 全文大小：493 K

文摘

We report on high-pressure x-ray diffraction measurements up to 17.2 GPa in mercury digallium selenide (HgGa₂Se₄). The equation of state and the axial compressibilities for the low-pressure tetragonal phase have been determined and compared to related compounds. HgGa₂Se₄ exhibits a phase transition on upstroke toward a disordered rock-salt structure beyond 17 GPa, while on downstroke it undergoes a phase transition below 2.1 GPa to a phase that could be assigned to a metastable zinc-blende structure with a total cation-vacancy disorder. Thermal annealing at low- and high-pressure shows that kinetics plays an important role on pressure-driven transitions.