Effect of complexing agents on the powder characteristics and sinterability of neodymium doped yttria nanoparticles

Autor:	Rekha Mann, Neelam Malhan, Kiranmala Laishram
Rok vydání:	2012
Předmět:	Materials science General Chemical Engineering Oxide Sintering Nanoparticle Mineralogy chemistry.chemical_element Neodymium law.invention chemistry.chemical_compound chemistry law Calcination Fourier transform infrared spectroscopy Citric acid Yttria-stabilized zirconia Nuclear chemistry
Zdroj:	Powder Technology. 229:148-151
ISSN:	0032-5910
DOI:	10.1016/j.powtec.2012.06.021
Popis:	We report the synthesis of neodymium doped cubic yttria (Nd:Y 2 O 3 ) nanopowders by microwave assisted combustion method using citric acid, urea and l -alanine as complexing agents as well as fuels. FTIR and XRD of powders calcined at 1000 °C for 3 h in oxygen atmosphere demonstrated formation and phase purity of Nd:Y 2 O 3 respectively. Varied morphologies of as prepared precursor and calcined oxide (from polyhedral to spheroidal) due to different complexing agents were observed by SEM and TEM. Sintering of these nanopowders with different morphologies after compaction by cold isostatic press at 400 MPa at 1700 °C for 10 h under 10 − 5 mbar vacuum gave maximum densification with 32.5% transmission by using l -alanine compared to 20% and 8% transmission obtained for urea and citric acid respectively. Thus l -alanine gave highly sinterable nanopowders with narrow size range of 25–40 nm with close to spherical morphology.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7967222f89b6371162110a5b30679b85 https://doi.org/10.1016/j.powtec.2012.06.021 Zobrazit plný text záznamu Full Text from ScienceDirect