Structural investigation in the TiB{sub 2}-(Na{sub 2}O.B{sub 2}O{sub 3}.Al{sub 2}O{sub 3}) system

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.07.023· OSTI ID:21432487

Buixaderas, Elena ^[1]; Petrescu, Simona ^[2]; Osiceanu, Petre ^[3]

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1. Institute of Physics, Academy of Science of the Czech Republic, Dielectrics Department, Na Slovance 2, 18221 Prague 8 (Czech Republic)
2. Institute of Physical Chemistry 'Ilie Murgulescu'of Romanian Academy, Molten Salts Department, Spl. Independentei 202, 060021 Bucharest (Romania)
3. Institute of Physical Chemistry 'Ilie Murgulescu' of Romanian Academy, Laboratory of Catalysis and Surface Chemistry, Spl. Independentei 202, 060021 Bucharest (Romania)

Composites in the TiB{sub 2}-Na{sub 2}O.B{sub 2}O{sub 3}.Al{sub 2}O{sub 3} systems, TiB{sub 2}-MBA (MB stands for sodium metaborate and A is Al{sub 2}O{sub 3}), were prepared by self-propagating high-temperature synthesis (SHS), in simultaneous mode. Selection of these compositions was ruled by the interesting properties of both TiB{sub 2} and double borates of alkali metal and aluminum. The structure of the obtained materials was evaluated by micro-Raman spectroscopy, from room temperature up to 600 {sup o}C, and X-ray photoelectron spectroscopy (XPS). Formation of the TiB{sub 2} and TiO{sub 2-x}B{sub x} phases along with TiO{sub 2} as rutile were identified as titanium speciation in the grain phase embedded in a sodium aluminum borate matrix. Integration of the Raman spectra of the grain phases revealed a TiB{sub 2} content of 16.99% and 23.32% for the two composite investigated 2TiB{sub 2}.2MBA and 3TiB{sub 2}.5MBA. A constrained-width model for the spectral deconvolution of the high-frequency Raman band was forwarded to calculate the proportion of tetrahedral boron atoms (7.424%) in the blank borate matrix Na{sub 2}B{sub 2}O{sub 4}.Al{sub 2}O{sub 3} in solid phase. - Graphical abstract: Deconvolution of the reduced Raman spectrum of the grain phase in TiB{sub 2}-(Na{sub 2}O.B{sub 2}O{sub 3}.Al{sub 2}O{sub 3}) composite along with its Raman micrographs collected at room temperature.

• OSTI ID: 21432487
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 9; Other Information: DOI: 10.1016/j.jssc.2010.07.023; PII: S0022-4596(10)00305-1; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BORATES
BORON OXIDES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
RUTILE
SODIUM OXIDES
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TITANIUM BORIDES
TITANIUM OXIDES
X-RAY PHOTOELECTRON SPECTROSCOPY
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BORIDES
BORON COMPOUNDS
CHALCOGENIDES
ELECTRON SPECTROSCOPY
LASER SPECTROSCOPY
MATERIALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
SODIUM COMPOUNDS
SPECTRA
SPECTROSCOPY
TEMPERATURE RANGE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS