@article { ISI:000227196900007,
	title = {Characterization of nanocrystalline anatase titania: an in situ HTXRD study},
	journal = {Thermochimica Acta},
	volume = {427},
	number = {1-2},
	year = {2005},
	month = {MAR},
	pages = {37-41},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Nanocrystalline titania was synthesized by the hydrolysis of titanium iso-propoxide using ultrasonication. The powder XRD patterns of the sample were recorded in static air and vacuum using a Philips X-pert Pro diffractometer equipped with a high-temperature attachment (HTK16) from room temperature (298 K) to 1173 K and were analyzed by the Rietveld refinement technique. The anatase to rutile phase transformation was observed at 1173 K for the data collected in static air. Only 3\% of anatase titania transformed to rutile when the experiments were carried out at H 73 K in vacuum. The phase transformation from anatase to rutile is accompanied by a continuous increase in the crystallite size of the anatase phase from 9 nm at room temperature to 28 nm at 873 K and then to 50 nm at 1173 K in air while the process of crystallite growth was suppressed in vacuum. A linear increase in the unit cell parameters {\textquoteleft}a{\textquoteright} and {\textquoteleft}c{\textquoteright}, and thus, an overall linear increase in the unit cell volume was observed as a function of temperature in static air as well as vacuum. The lattice and volume thermal expansion coefficients (TEC), alpha(a), alpha(c), and alpha(v) at 873 K are 8.57 x 10(-6), 8.71 x 10(-6) and 25.91 x 10(-6) K-1 in air and 18.01 x 10(-6), 14.95 x 10(-6) and 51.13 x 10(-6) K-1 in vacuum, respectively. (C) 2004 Elsevier B.V. All rights reserved.</p>},
	keywords = {Anatase, HTXRD, Rietveld refinement, rutile, thermal expansion coefficient, titania},
	issn = {0040-6031},
	doi = {10.1016/j.tca.2004.08.011},
	author = {Jagtap, Neelam and Bhagwat, Mahesh and Awati, Preeti and Ramaswamy, Veda}
}
