Poster DOI: 10.1002/zaac.200870035 Characterization of nano-nickel and iron borides with EXAFS and ICP-OES Barbara Albert a *, Steffi Rades a,b , Christine Kapfenberger a , Denis Fofanov b , Enno Klüver a , J.A. Broekaert b a Eduard-Zintl-Institut für Anorganische und Physikalische Chemie der TU Darmstadt, Petersenstr. 18, 64287 Darmstadt; b Institut für Anorganische und Angewandte Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg E-mail: [email protected] Keywords: Boride; low-temperature synthesis; EXAFS; ICP-OES Borides both bulk and nano materials often exhibit fascina- ting electronic, magnetic and chemical properties. Many metal borides ofknown and unknown composition can be obtained by high temperature synthesis. New methods of preparation at low temperatures open the way to nano precipitates that contain transition metals and boron. We obtained nano nickel [1-3] and iron borides [4,5] by wet- chemical precipitation methods at low temperatures. Characteriza- tion included qualitative analysis, determination of particle size and distribution, quantitative analysis, and analysis of the crystallinity of the samples (XRD, SEM, TEM, EDX, ICP-OES). We also probed for the coordination environment of the boron atoms (EELS) and for the different states of oxidation and coordination environments of the transition metal ions (XAS). In addition, crystalline and macroscale borides [6] and borates [7] were synthesized in high temperature reactions. They were used as reference materials and for calibration purposes. [1] C. Kapfenberger, K. Hofmann, B. Albert, Solid State Sciences 2003, 5, 925. [2] C. Kapfenberger, PhD thesis, University of Hamburg 2005. [3] S. Rades, diploma thesis, University of Hamburg 2005. [4] D. Fovanov, PhD thesis, University of Hamburg 2006. [5] S. Rades, PhD thesis in preparation. [6] C. Kapfenberger, B. Albert, R. Pöttgen, H. Huppertz, Z. Kristallogr. 2006, 221, 477. [7] E. Klüver, B. Albert, publication in preparation. www.zaac.wiley-vch.de © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Z. Anorg. Allg. Chem. 2008, 2026 2026

Characterization of nano-nickel and iron borides with EXAFS and ICP-OES

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Page 1: Characterization of nano-nickel and iron borides with EXAFS and ICP-OES

Poster

DOI: 10.1002/zaac.200870035

Characterization of nano-nickeland iron borides with EXAFS andICP-OES

Barbara Alberta*, Steffi Radesa,b,Christine Kapfenbergera, Denis Fofanovb,Enno Klüvera, J.A. Broekaertb

a Eduard-Zintl-Institut für Anorganische und PhysikalischeChemie der TU Darmstadt, Petersenstr. 18, 64287 Darmstadt;b Institut für Anorganische und Angewandte Chemie, UniversitätHamburg, Martin-Luther-King-Platz 6, 20146 HamburgE-mail: [email protected]

Keywords: Boride; low-temperature synthesis; EXAFS; ICP-OES

Borides � both bulk and nano materials � often exhibit fascina-ting electronic, magnetic and chemical properties. Many metalborides ofknown and unknown composition can be obtained byhigh temperature synthesis. New methods of preparation at lowtemperatures open the way to nano precipitates that contain transi-tion metals and boron.We obtained nano nickel [1-3] and iron borides [4,5] by wet-chemical precipitation methods at low temperatures. Characteriza-tion included qualitative analysis, determination of particle size anddistribution, quantitative analysis, and analysis of the crystallinityof the samples (XRD, SEM, TEM, EDX, ICP-OES). We alsoprobed for the coordination environment of the boron atoms(EELS) and for the different states of oxidation and coordinationenvironments of the transition metal ions (XAS).In addition, crystalline and macroscale borides [6] and borates [7]were synthesized in high temperature reactions. They were used asreference materials and for calibration purposes.

[1] C. Kapfenberger, K. Hofmann, B. Albert, Solid State Sciences

2003, 5, 925.[2] C. Kapfenberger, PhD thesis, University of Hamburg 2005.[3] S. Rades, diploma thesis, University of Hamburg 2005.[4] D. Fovanov, PhD thesis, University of Hamburg 2006.[5] S. Rades, PhD thesis in preparation.[6] C. Kapfenberger, B. Albert, R. Pöttgen, H. Huppertz, Z.

Kristallogr. 2006, 221, 477.[7] E. Klüver, B. Albert, publication in preparation.