Abstract: The multicomponent oxide glass has a composition including: 45-53 mol % SiO2; 22-30 mol % B2O3; 5-9 mol % Al2O3; 0.02-0.10 mol % Sb2O3; 0-18 mol % Li2O; 0-18 mol % Na2O; 0-18 mol % K2O; 0-13 mol % MgO; 0-13 mol % CaO; 0-13 mol % BaO; and 0-13 mol % ZnO. When the total content of Li2O, Na2O, and K2O is X mol % and the total content of MgO, CaO, BaO, and ZnO is Y mol %, 11?X?18 and 14?X+Y?24 hold, and the value of ?OH calculated from ?OH=?/t, where ? represents a height of an absorption peak due to OH groups, observed in a range of 3400 cm?1 to 3800 cm?1 of an infrared absorption spectrum in no unit and t represents a thickness of the glass in cm, is 4 cm?1 or more.

Abstract: The present disclosure is to provide a method of producing a LTP or LATP crystal particle that has reduced impurity contamination, high crystallinity, and excellent dispersibility. The method of producing a LTP or LATP crystal particle according to the present disclosure includes: preparing glass containing, in molar ratio, 1+x of Li2O, where 0?x?1, x of Al2O3, 4?2x of TiO2, 3+y of P2O5, where 1?y?4, and from more than y to less than 3y of ZnO; subjecting, after the preparation of glass, the glass to thermal treatment for crystallization; and selectively eluting a substance other than a LTP or LATP crystal through acid treatment.

Abstract: The present disclosure is to provide a method of producing a LTP or LATP crystal particle that has reduced impurity contamination, high crystallinity, and excellent dispersibility. The method of producing a LTP or LATP crystal particle according to the present disclosure includes: preparing glass containing, in molar ratio, 1+x of Li2O, where 0?x?1, x of Al2O3, 4?2x of TiO2, 3+y of P2O5, where 1?y?4, and from more than y to less than 3y of ZnO; subjecting, after the preparation of glass, the glass to thermal treatment for crystallization; and selectively eluting a substance other than a LTP or LATP crystal through acid treatment.