Determination of percentage of crystal dissolved through calculation of volume change from observed area change for analysed 4.0 mol% 2-doped 1 crystals.

Sample	Obs. area (μm2)	Calc. volume eq. sphere (μm3)	% dissolved
Initial	1 833 294	1867 291 503
PD1	1 650 782	1595 505 713	14.56
PD2	1 559 270	1464 690 868	7.01
PD3	1 413 132	1263 682 314	10.77
PD4	1 269 519	1076 025 008	10.05
PD5	1 126 801	899 776 935	9.44
PD6	828 151.4	566 928 692	17.83