Dense Mg (x) Ni1-x O nanocubes with special grain boundaries and paracrystalline distribution of defect clusters by pulsed laser ablation

作者：Wu, Ren Hao; Lin, Shih Siang; Shen, Pouyan; Chen, Shuei Yuan^*

来源：Applied Physics A, 2015, 120(3): 1121-1132.

DOI：10.1007/s00339-015-9287-9

Pulsed laser ablation of reactively sintered MgO-NiO (9:1, 1:1, 1:9 molar ratio) disks was used to fabricate dense rocksalt-type Mg (x) Ni1-x O in the form of submicron-sized spherical particulate and nanocubes for X-ray diffraction and transmission electron microscopic characterizations. The rapidly solidified particulates and the condensed nanocubes have internal compressive stress increasing up to ca. 1 GPa with the increases in Ni content. The nanocubes were coalesced over well-developed polar surfaces, i.e., {100}, minor {110} and their vicinal surfaces with growth ledges, to form special grain boundaries, i.e., (100) 15A degrees and 45A degrees twist boundaries and [100] {001}/{011} asymmetric tilt boundaries. The Mg (x) Ni1-x O nanocubes also showed 3-D paracrystalline distribution of defect clusters with 2 nm and 1.5-2 nm interspacing for M1N9 and M1N1 compositions, respectively, but G.P. zone-like features for M9N1 composition. The Mg (x) Ni1-x O particulates and nanocondensates have UV-visible absorption edge in the range 4.0-3.3 eV, decreasing with increasing Ni content for potential engineering applications.

• 出版日期2015-9
• 单位中山大学