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HR-TEM micrograph of nanoscale titanium dioxide samples of different structure: amorphous (a, b), brookite (c, d), anatase (e, f), and rutile (g, h). Arrows indicate planes of the aggregate formed by spliced particles. The needle crystals consist of coherently spliced crystallites having the size of 5-6 nm along plane (100) and 4-5 nm along plane (110).
