PROBLEM TO BE SOLVED: To provide a glass ceramic composition and glass ceramic sintered body each of which has a low thermal expansion coefficient upon transformation and has a small variation of thermal expansion coefficient upon a plurality of times of firing .SOLUTION: The glass ceramic composition includes a glass phase containing cristobalite crystal. The glass phase contains SiO2 component of 75 mol% to 83 mol%, Al2O3 component of 3 mol% to 5 mol%, B2O3 component of 2 mol% to 10 mol%, Li2O component of 2 mol% to 3 mol%, Na2O component of 3 mol% to 5 mol%, K2O component of 2 mol% to 4 mol%, CaO component of 0.01 mol% to 1 mol%, and ZnO component of 0.01 mol% to 2 mol%.COPYRIGHT: (C)2016,JPO&INPIT【課題】変態時における熱膨張係数が低いと共に、複数回焼成における熱膨張係数の変動が小さいガラスセラミック組成物及びガラスセラミック焼結体を提供すること。【解決手段】ガラスセラミック組成物は、クリストバライト結晶を含有するガラス相を含む。ガラス相が、75mol%~83mol%のSiO2成分、3mol%~5mol%のAl2O3成分、2mol%~10mol%のB2O3成分、2mol%~3mol%のLi2O成分、3mol%~5mol%のNa2O成分、2mol%~4mol%のK2O成分、0.01mol%~1mol%のCaO成分、及び0.01mol%~2mol%のZnO成分、を含有する。【選択図】図1
