fig5
![Cryogenic atom probe tomography and its applications: a review](https://image.oaes.cc/5ca7242f-4578-410a-9002-1be3b02ceea2/microstructures3038.fig.5.jpg)
Figure 5. APT specimen preparation from a bulk nanoporous gold (NPG) with frozen heavy water (D2O ice) in a plasma FIB. (A) NPG and D2O ice before annular milling with the 200- and 75-μm milling patterns. (B) D2O ice/NPG pillar during ion milling. (C) Ice/NPG tip after milling. (D) High-resolution view of the final APT tip. Reproduced with the permission of Ref.[32] Copyright 2023, Science Advances.