Nanotwin hardening in a cubic chromium oxide thin film
Nanotwin hardening in a cubic chromium oxide thin film
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DOI：
10.1063/1.4931749
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发表时间：
2015-09
期刊：
影响因子：
6.1
通讯作者：
Kazuma Suzuki;Tsuneo Suzuki;Y. Nakajima;Y. Matsui;H. Suematsu;T. Nakayama;K. Niihara
中科院分区：
文献类型：
--
作者：
Kazuma Suzuki;Tsuneo Suzuki;Y. Nakajima;Y. Matsui;H. Suematsu;T. Nakayama;K. Niihara
NaCl型（B1）氧化铬（CrO）被认为具有高硬度值，不作为平衡相存在。我们报告了一种基于B1的Cr0.67O薄膜的厚度为144 nm的脉冲激光沉积作为外延薄膜上的MgO单晶。薄膜中含有大量的层错，并具有由B1和无序空位组成的纳米孪晶结构。Cr0.67O薄膜具有44 GPa的高压痕硬度值，使其成为迄今为止报道的最硬的氧化物薄膜。
NaCl-type (B1) chromium oxide (CrO) has been expected to have a high hardness value and does not exist as an equilibrium phase. We report a B1-based Cr0.67O thin film with a thickness of 144 nm prepared by pulsed laser deposition as an epitaxial thin film on a MgO single crystal. The thin film contained a number of stacking faults and had a nanotwinned structure composed of B1 with disordered vacancies and corundum structures. The Cr0.67O thin film had a high indentation hardness value of 44 GPa, making it the hardest oxide thin film reported to date.