['A', 'complete', 'characterisation', 'of', 'the', 'oxide', 'particles', ',', 'including', 'crystal', 'structure', 'and', 'composition', ',', 'is', 'needed', 'as', 'different', 'phases', 'and', 'chemical', 'variants', 'of', 'a', 'single', 'structure', 'have', 'been', 'shown', 'to', 'respond', 'differently', 'to', 'high', 'temperatures', 'and', 'irradiation', '.']