The flow rate of purge gas (pure N2, 99.99%) was kept at 200 mL min1. The sample was heated from the ambient temperature up to 900 C with a heating rate of 10 C min1
The flow rate of purgegas (pure N2, 99.99%) was kept at 200 mL min1. The sample washeated from the ambient temperature up to 900 C with a heatingrate of 10 C min1