| abstract |
Provided are: a porous plate-shaped filler capable of being used as a material for a heat-insulating film having excellent heat insulating properties; and the heat-insulating film. The porous plate-shaped filler (1) is a single-phase ZrO 2 -based porous plate-shaped filler (1), having an aspect ratio of at least 3, having a minimum length of 0.1-50 µm, having a porosity of 20%-90%, having some Zr replaced by tetravalent atoms, and having a O and Zr molar ratio in the range of 2 < O / Zr < 2.4. As a result of some of the Zr in the ZrO 2 particles constituting the porous plate-shaped filler being replaced by other atoms (Ti, Si, Ce, Hf), the crystal structure becomes complex and phonons are more easily dispersed. |