Particles having rutile crystal structure, production method therefor, and production method for particle dispersion liquid, coating liquid, and substrate with film

Particles having a rutile-type crystal structure, comprising:

• a core including tin and titanium;
• and
• a shell including titanium,
• wherein a crystallite diameter of the particles is 7 nm or more,
• the particles contain 90% by weight or more titanium oxide in terms of TiO2,
• the particles contain 0.2 to 10% by weight tin oxide in terms of SnO2,
• a proportion of tin in the core is 0.1-6.5 at %;
• and
• a proportion of tin in the shell is less than 0.1 at %.