PHASE TRANSITION IN LAYERED PEROVSKITE LIKE MANGANATE Ca3Mn2O7 UNDER HIGH PRESSURE

• 作者: C.Q.JIN F.Y.LI J.L.ZHU J.LIU L.C.CHEN R.C.YU
• 来源期刊: 北京同步辐射装置：英文版
• 学科: 物理学
• 关键词: 高压 X射线衍射 Ca3Mn2O7 钙钛矿结构 锰酸盐晶体 相变 晶体结构
• 年，卷（期）: bjtbfszzywb,（2）
• 页码范围: 180-186
• 页数: 0页
• 分类号: O521

摘要

In situ high pressure energy dispersive X-ray diffraction measurements on layered perovskite-like manganate Ca3Mn2O7 under pressures up to 35 GPa have been Performed by using diamond anvil cell with synchrotron radiation.The results show that the structure of layered perovskite-like manganate Ca3Mn2O7 is unstable under pressure due to the easy compression of NaCl-type blocks.The structure of Ca3Mn2O7 underwent two phase transitions under pressures in the range of 0-35GPa.One was at about 1.3GPa with the crystal structure changing from tetragonalt go orthorhombic.The other was at about 9.5GPa with the crystal structure changing form orthorhombic back to another tetragonal.