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SEM images of cross-sections parallel and perpendicular to the freezing direction for sintered constructs (1 h at 700 °C) prepared by freezing on a constant-temperature substrate (3 °C) (a, c), or at a constant rate of 7 °C /min (b, d, e). Sections parallel to the freezing direction (a, b) and perpendicular to the freezing direction (c, d, e) are shown.
