Intense blue and green photoluminescence emissions at room temperature in barium zirconate powders
Creators
- 1. Departamento de Quimica e Fisica, UFSCar, P.O. Box 676, 13565-905, Sao Carlos, SP (Brazil)
- 2. Instituto de Quimica, UNESP, P.O. Box 355, 14801-907, SP, Araraquara, SP (Brazil)
- 3. Instituto de Fisica de Sao Carlos, USP, P.O. Box 369, 13560-970, Sao Carlos, SP (Brazil)
- 4. Universite Paris XII, Faculte des Sciences et Technologie Batiment Marie Curie (P2)-345b, 94010 (France)
Description
Intense blue and green photoluminescence (PL) emissions were observed at room temperature in barium zirconate (BaZrO3) powders prepared by chemical method. The powders were analyzed by X-ray diffraction (XRD), X-ray absorption near edge spectroscopy (XANES), extended X-ray absorption spectroscopy (EXAFS) and ultraviolet-visible (UV-vis) absorption spectroscopy. The XRD patterns indicated the presence of a secondary phase of BaCO3 in BaZrO3 powders heat treated at 773 K. K-edge XANES data revealed that Zr atoms presents in at least two Zr environments. EXAFS investigations showed strong bond length dispersion in the first coordination shell around Zr atoms. EXAFS analysis indicated that Zr atoms are coordinated by 6 oxygen in BaZrO3 powders heat treated at 973 K. UV-vis measurements suggested the presence of intermediary energy levels into the band gap of BaZrO3 powders heat treated at 773 K. The intense PL emission in BaZrO3 powders can be attributed to the two Zr environments or ZrO5-ZrO6 clusters
Availability note (English)
Available from http://dx.doi.org/10.1016/j.jallcom.2008.03.080Additional details
Identifiers
- DOI
- 10.1016/j.jallcom.2008.03.080;
- PII
- S0925-8388(08)00499-4;
Publishing Information
- Journal Title
- Journal of Alloys and Compounds
- Journal Volume
- 471
- Journal Issue
- 1-2
- Journal Page Range
- p. 253-258
- ISSN
- 0925-8388
- CODEN
- JALCEU
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40052894
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ABSORPTION; ABSORPTION SPECTROSCOPY; BARIUM CARBONATES; BARIUM COMPOUNDS; BOND LENGTHS; ENERGY LEVELS; FINE STRUCTURE; HEAT TREATMENTS; PHOTOLUMINESCENCE; POWDERS; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 1000-4000 K; ULTRAVIOLET RADIATION; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY; ZIRCONATES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATES; COHERENT SCATTERING; DIFFRACTION; DIMENSIONS; ELECTROMAGNETIC RADIATION; EMISSION; LENGTH; LUMINESCENCE; OXYGEN COMPOUNDS; PHOTON EMISSION; RADIATIONS; SCATTERING; SORPTION; SPECTROSCOPY; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS
Optional Information
- Copyright
- Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.