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Normalized unit cell volumes V of the M (blue) and R (red) phases for different holding times t at 900 °C for Ni35-Al01. The mean volume (black) is calculated using a constant value of 76 mol% M derived from NPD data [2]. The dashed lines correspond to the unit cell parameters found previously for Ni35-Al01 for a calcination time of 6 h [2]. The unit cell volume for the pyrolyzed starting material is shown by the filled green circle.
