Behavior of Yb³⁺ and Er³⁺ during Heat Treatment in Oxyfluoride Glass Ceramics

Table 1

Composition (mol%), fluorine content (Wt%), and characteristic temperatures (𝑇_𝑔, 𝑇_𝑚, and crystallization temperatures of CaF₂ and Ca₂Al₃O₆F in °C) of the precursor glass samples.

Sample code	SiO2	Al2O3	CaF2	ErF3	YbF3	Fluorine content	𝑇𝑔/𝑇𝑚	CaF2	Ca2Al3O6F
SA1.8	45	25	35	—	—	11.5±0.01	583/969	720	867
SA2.18	48	22	35	—	—	11.00±0.01	570/984	705	861
SA1.8EY	45	25	35	0.5	2	12.4±0.01	500, 605/1009	675	871
SA2.18EY	48	22	35	0.5	2	12.2±0.01	461/1018	660	865