J. Mater. Sci. Technol. ›› 2020, Vol. 40: 31-38.DOI: 10.1016/j.jmst.2019.08.039
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Kun Liua, Ruyi Zhanga, Lu Lua, Shaobo Mia*(), Ming Liua, Hong Wangab, Shengqiang Wua, Chunlin Jiaac
Received:
2019-07-01
Revised:
2019-08-22
Accepted:
2019-08-28
Published:
2020-03-01
Online:
2020-04-01
Contact:
Mi Shaobo
Kun Liu, Ruyi Zhang, Lu Lu, Shaobo Mi, Ming Liu, Hong Wang, Shengqiang Wu, Chunlin Jia. Atomic-scale investigation of spinel LiFe5O8 thin films on SrTiO3 (001) substrates[J]. J. Mater. Sci. Technol., 2020, 40: 31-38.
Fig. 1. (a) Low-magnification BF-TEM image of a LFO film on STO (001) substrate. The film-substrate interface is indicated by a horizontal white arrow. The oblique fringe lines are denoted by red arrows. (b) Typical SAED pattern of the LFO/STO (001) system, recorded along the [1 $\bar{1}$ 0] STO zone axis. The splitting of the reflection spots is indicated by the horizontal and the vertical arrows. (c) High-resolution HAADF image of the heterostructure showing the existence of two types of OR between the film and the substrate, viewed along the [1 $\bar{1}$ 0] STO zone axis. The TB is indicated by an oblique red arrow. The film-substrate interface is indicated by a horizontal white arrow.
Fig. 2. High-resolution HAADF image of the film-substrate interface, viewed along the [1 $\bar{1}$ 0] STO zone axis, showing the formation of misfit dislocations and an APB at the interface. The APB is indicated by a vertical white arrow. The film-substrate interface is denoted by a horizontal white arrow.
Fig. 3. (a, b) Atomic-resolution HAADF image of the LFO film containing TB-I and TB-II, respectively, recorded along the [1 $\bar{1}$ 0] LFO zone axis. The TB-I is indicated by an oblique green, and the TB-II by an oblique white arrow. The red dashed lines denote the Fe[Li0.5Fe1.5]O2 atomic plane. (c, d) Atomic-resolution HAADF and ABF image of TB-III, recorded simultaneously along the [1 $\bar{1}$ 0] LFO zone axis. The cation-deficient plane is marked by oblique red arrows. The atomic column with cation-deficiency is indicated by orange arrows. The red dashed lines denote the Fe[Li0.5Fe1.5]O2 atomic plane.
Fig. 4. (a-c) The structure model of TB-I, TB-II and TB-III, respectively, viewed along the [1 $\bar{1}$ 0] LFO zone axis. The twin plane is marked by a black dashed line. In (c), the atomic plane with cation-deficiency is indicated by a horizontal red arrow. Cation-deficient sites are marked by black dashed circles.
Fig. 5. Atomic-resolution HAADF image showing the complex interaction between TBs and APBs, recorded along the [1 $\bar{1}$ 0] LFO zone axis. (a) Interaction of APBs with TB-I and TB-III. (b) Interaction of APBs with TB-II and TB-III. (c) Interaction of APBs with TB-I and TB-II. In (a-c), APBs are indicated by a yellow arrow and the triple junctions are marked by ellipses. TB-I, TB-II and TB-III are indicated by a green, a white and a red arrow, respectively.
Fig. 6. Atomic-resolution HAADF image showing the interaction of a thin twin lamella with APBs, recorded along the [1 $\bar{1}$ 0] LFO zone axis. TBs and APBs are indicated by oblique red and vertical yellow arrows, respectively. A boundary within the thin twin lamella resulting from the shear displacement is marked by a white dashed line, which connects with the APBs, as marked by yellow dashed lines.
Fig. 7. (a) Atomic-resolution HAADF image of the LFO film showing that the interactions of coherent TBs produce incoherent TB. The triple junction is marked by an ellipse. The red dashed lines denote the Fe[Li0.5Fe1.5]O2 atomic plane. (b) A schematic model of the interaction between two TBs-III. The incoherent TB is marked in blue. In (a) and (b), the coherent TBs are indicated by red arrows, and the incoherent TB is indicated by a yellow arrow.
Fig. 8. Structure model of the relationship among TB-I, TB-II and TB-III. The twin plane of oxygen sublattice is indicated by a horizontal black dashed-line. The atomic plane with cation-deficiency in the TB-III is marked by a horizontal red arrow.
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