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000186618 1001_ $$0P:(DE-HGF)0$$aGuenther, Gerrit$$b0$$eCorresponding Author
000186618 245__ $$aSolid state transitions of Bi$_{2}$O$_{3}$ nanoparticles
000186618 260__ $$aWarrendale, Pa.$$bMRS$$c2014
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000186618 520__ $$aThe solid-state phase transitions of bismuth(III) oxide (Bi2O3) nanoparticles were investigated by complementary methods such as differential scanning calorimetry, differential thermal analysis with combined thermogravimetry and mass spectrometry, and high-temperature x-ray diffraction as compacted nanopowder. At room temperature the particles resided in the β-phase, which is usually a metastable high-temperature phase of bulk Bi2O3. The complementary experimental methods were linked and a nanophase (tetragonal β-phase) → bulk-phase (monoclinic α-phase) transition was identified which was preceded by crystal growth and evaporation of O and C containing species. It was also shown that the atmosphere (more precisely its absolute pressure) has an influence on the transition behavior. An interpretation was proposed that successfully explains all observations from this work and from literature: A sudden destabilization takes place around 735 K due to the loss of the stabilizing, carbonized surface. This leads to the observed transformation to the bulk-phase. But if the particles are smaller than a certain, critical size in the nanorange and are not allowed to grow, they remain in the nanophase until they melt.
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000186618 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b1$$ufzj
000186618 773__ $$0PERI:(DE-600)2015297-8$$a10.1557/jmr.2014.124$$gVol. 29, no. 12, p. 1383 - 1392$$n12$$p1383 - 1392$$tJournal of materials research$$v29$$x2044-5326$$y2014
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