Patent ID: 7842370

Claim:
A cordierite ceramic comprising at least zirconium oxide or hafnium oxide, and also including titanium oxide, wherein a molar ratio of zirconium (Zr), hafnium (Hf) and titanium (Ti) in terms of moles in the form of dioxides, respectively, which is given by the formula [(ZrO 2 +HfO 2 )/TiO 2 ], is in a range of 0.1 to 5; wherein a total content of the zirconium oxide and the hafnium oxide is 0.01 to 10% by mass when zirconium and hafnium are expressed as zirconium dioxide (ZrO 2 ) and hafnium dioxide (HfO 2 ), respectively; and wherein the zirconium oxide and the titanium oxide are contained as zirconium titanate, or the hafnium oxide and the titanium oxide are contained as hafnium titanate.