Details

Autor(en) / Beteiligte

• Chen, Hongxiang
• Yang, Dongliang
• Zhang, Qinghua
• Jin, Shifeng
• Guo, Liwei
• Deng, Jun
• Li, Xiaodong
• Chen, Xiaolong

Titel

A Series of MAX Phases with MA‐Triangular‐Prism Bilayers and Elastic Properties

Ist Teil von

• Angewandte Chemie International Edition, 2019-03, Vol.58 (14), p.4576-4580

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report a new type of MAX phase (M=transition metals, A=main group elements, and X=C/N), Nb3As2C, designated as 321 phase. It differs from all the previous Mn+1AXn phases in that it consists of an alternate stacking of one MX layer and two MA layers in its unit cell, while only one MA layer is allowed in usual MAX phases. The new 321 phase exhibits a bulk modulus of Nb3As2C up to 225(3) GPa as determined by high‐pressure synchrotron X‐ray diffraction, one of the highest values among MAX phases. Isostructural 321 phases V3As2C, Nb3P2C, and Ta3P2C are also found to exist. First‐principles calculations reveal the outstanding elastic stiffness in 321 phases. Among all 321 phases, Nb3P2C is predicted to have the highest elastic properties. These 321 phases, represented by a chemical formula Mn+1AnX, were added as new members to the MAX family and their other properties deserve future investigations. Get the MAX: A series of MAX phases (M=transition metals, A=main group elements, and X=C/N) with outstanding elastic properties, named 321 phases, is added to the family of MAX phases. 321 phases share common symmetry and constituent units with the conventional Mn+1AXn phases. 321 phases are the first series of MAX phases that can be expressed as Mn+1AnX with n>1.