TGA. TG measurements were performed on a Netzsch instrument, TG 209 F3 Tarsus. 1-2 mg of the sample was placed in a TGA pan (Al2O3, 6.8 mm and 85 microliters, 1700 0 C), and mass loss was observed by heating from 30 0 C to 400 0 C under a constant flow of nitrogen.