Transportation of Na and Li in hydrothermally grown ZnO
2010 (English)In: Zinc oxide and related materials 2009, Materials Research Society, 2010, 29-34 p.Conference paper (Refereed)
Secondary ion mass spectrometry has been applied to study the transportation of Na and Li in hydrothermally grown ZnO. A dose of 10 15 cm-2 of Na+ was implanted into ZnO to act as a diffusion source. A clear trap limited diffusion is observed at temperatures above 550 °C. From these profiles, an activation energy for the transport of Na of 7 ∼1.7 eV has been extracted. The prefactor for the diffusion constant and the solid solubility of Na cannot be deduced independently from the present data but their product estimated to be ∼ 3 × 1016 cm-1 s-1. A dissociation energy of ∼2.4 eV is extracted for the trapped Na. The measured Na and Li profiles show that Li and Na compete for the same traps and interact in a way that Li is depleted from Na-rich regions. This is attributed to a lower formation energy of Na-on-zinc-site than that for Li-on-zinc-site defects and the zinc vacancy is considered as a major trap for migrating Na and Li atoms. Consequently, the diffasivity of Li is difficult to extract accurately from the present data, but in its interstitial configuration Li is indeed highly mobile having a diffasivity in excess of 10-11 cm2 s-1 at 500 °C .
Place, publisher, year, edition, pages
Materials Research Society, 2010. 29-34 p.
, Materials Research Society Symposium Proceedings, ISSN 0272-9172 ; 1201
Diffusion constant, Diffusion sources, Dissociation energies, Formation energies, Hydrothermally, Li atoms, Prefactors, Solid solubilities, Zinc vacancy, ZnO, Diffusion, Mass transportation, Secondary ion mass spectrometry, Vacancies, Zinc, Zinc oxide, Activation energy
IdentifiersURN: urn:nbn:se:kth:diva-149387ScopusID: 2-s2.0-77953980500ISBN: 978-160511174-2OAI: oai:DiVA.org:kth-149387DiVA: diva2:739662
2009 MRS Fall Meeting, 30 November 2009 through 4 December 2009, Boston, MA, United States
QC 201408212014-08-212014-08-212014-08-21Bibliographically approved