A long-period superlattice phase in Mg₉₇Zn₁Yb₂ alloys synthesized under high-pressure

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• 作者：Masafumi Matsushita^a ; ^{matsushita.masafumi.me@ehime-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Ryota Inugai^a ; Michiaki Yamasaki^b ; ^c ; Toru Shinmei^d ; Yoshihito Kawamura^c ; Tetsuo Irifune^d ; ^e ; Naoya Fujita^f ; Eiji Abe^f ; ^{abe@material.t.u-tokyo.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Magnesium alloys ; Long-period structure ; High-pressure synthesis ; Valence fluctuations ; Scanning transmission electron microscopy
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：121
• 期：Complete
• 页码：45-49
• 全文大小：930 K

文摘

A novel long-period superlattice Mg₇₇Zn₉Yb₁₄ phase, whose dimensions are described as √ 3 × √ 3 × 3 with respect to the original hexagonal close-packed Mg lattice, has been found in Mg₉₇Zn₁Yb₂ alloys synthesized under high pressure (5 GPa) and at high temperature (723 K). A preliminary model structure is constructed based on atomic-resolution electron microscopy and first-principles calculations, providing local configurations around Yb atoms whose sizes appear to be smaller than those of a divalent Yb. This may be reasonably attributed to an applied high-pressure effect.