caa a22 4500 388022582 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199805 xx s 000 0 eng 10.1557/JMR.1998.0175 doi S0884291400044113 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0175 Influence of atmosphere on crystallization of zirconia from a zirconium alkoxide [Elektronische Daten] Dibutoxybis (acetylacetonato) zirconium, a difunctional zirconium alkoxide, was polymerized at 130 °C for 5 h in vacuo to produce oligomers that could be pyrolyzed to form a tetragonal zirconia (t-ZrO2), metastable at room temperature. This metastable phase was retained considerably below the equilibrium transformation temperature (∼1200 °C) without the use of dopants. Comparative pyrolysis of the oligomers between 600 and 900 °C in either flowing O2 or N2 for processing times under 12 h indicated t-ZrO2 nucleated first. Pyrolysis in oxygen facilitated transformation to the monoclinic symmetry, whereas pyrolysis in nitrogen demonstrated retention of the tetragonal phase. The formation of oxygen vacancies during pyrolysis, their role in stabilizing the metastable tetragonal phase, and contributions of O2 and crystallite size in the polymorphic transformation are discussed. Copyright © Materials Research Society 1998 Collins David E. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 Bowman Keith J. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 Journal of Materials Research Cambridge University Press 13/5(1998-05), 1230-1237 0884-2914 13:5<1230 1998 13 JMR https://doi.org/10.1557/JMR.1998.0175 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0175 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Collins David E. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 NATIONALLICENCE 700 1- Bowman Keith J. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/5(1998-05), 1230-1237 0884-2914 13:5<1230 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge