Microwave-Hydrothermal Synthesis of Transition Metal Tungstates with Nanosized Particles

Kisla P.F. Siqueira; Anderson Dias

doi:10.4028/www.scientific.net/SSP.194.209

Paper Titles

Mechanically Driven Dissolution of Sn in Near-Equiatomic Bcc FeCo
p.187

Development of Mechanically Alloyed and Sintered W-1 wt.% Ni Matrix Composites Reinforced with TiB₂
p.194

Superhard Composite Containing Boron Nitride and Silicon Nitride
p.199

Si Nanocrystals Deposited by HFCVD
p.204

Microwave-Hydrothermal Synthesis of Transition Metal Tungstates with Nanosized Particles
p.209

Soft Chemistry Synthesis of Complex Oxides Using Protonic Form of Titanates HLnTiO₄ (Ln=La, Nd)
p.213

Effects of La₂O₃ Addition on the Microstructure and Properties of Activated Sintered W-Ni Compacts
p.217

Crystallization and Thermal Behavior of 2MX·CuX₂·2H₂O (M⁺ = K, NH₄, Rb, Cs; X^- = Cl, Br)
p.222

Calorimetric Study of the Hydrogen Interaction with Ce₆Ni_1.67Si₃
p.226

HomeSolid State PhenomenaSolid State Phenomena Vol. 194Microwave-Hydrothermal Synthesis of Transition...

Microwave-Hydrothermal Synthesis of Transition Metal Tungstates with Nanosized Particles

Abstract:

Microwave-hydrothermal processing was employed to synthesize Mn and Co tungstates under environmentally friendly conditions. X-ray diffraction showed that crystalline, single-phase materials were produced. Incipient crystallized compounds were also obtained in some conditions, as verified by TEM. For these samples, nanostructured regions could be observed inside the amorphous matrix. Sintered solid-solutions of Mn_1-xCo_xWO₄ compounds were produced to investigate the morphological and structural changes in the resulted ceramic. Raman spectroscopy was used to obtain a reliable set of spectra containing all the Raman-active bands predicted by group-theory calculations.

You might also be interested in these eBooks

Solid Compounds of Transition Elements II

View Preview

Info:

Periodical:

Solid State Phenomena (Volume 194)

Pages:

209-212

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.194.209

Citation:

Cite this paper

Online since:

November 2012

Authors:

Kisla P.F. Siqueira, Anderson Dias

Keywords:

Crystal Structure, Microwave-Hydrothermal, Multiferroic, Raman Scattering, Tungstates

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] K.P.F. Siqueira, R.L. Moreira, M. Valadares, A. Dias, Microwave-hydrothermal preparation of alkaline-earth-metal tungstates, J. Mater. Sci. 45 (2010) 6083-6093.

DOI: 10.1007/s10853-010-4694-y

Google Scholar

[2] Y.S. Song, J.H. Chung, J.M.S. Park, Y.N. Choi, Stabilization of the elliptical spiral phase and the spin-flop transition in multiferroic Mn(1-x)Co(x)WO(4), Phys. Rev. B 79 (2009) 224415.

Google Scholar

[3] K.P.F. Siqueira, A. Dias, Incipient crystallization of transition-metal tungstates under microwaves probed by Raman scattering and transmission electron microscopy, J. Nanoparticle Res. 13 (2011) 5927-5933.

DOI: 10.1007/s11051-011-0248-8

Google Scholar

[4] B.A.H. Sanchez, T.J. Boyle, H.D. Pratt, M.A. Rodriguez, L.N. Brewer, DR. Dunphy, Morphological and phase controlled tungsten based nanoparticles: synthesis and characterization of scheelite, wolframite, and oxide nanomaterials, Chem. Mater. 20 (2008) 6643-6656.

DOI: 10.1021/cm801387z

Google Scholar

[5] T. Thongtem, A. Phuruangrat, S. Thongtem, Synthesis of CaWO4, SrWO4 and BaWO4 with nanosized particles using cyclic microwave radiation, J. Ceram. Proc. Res. 9 (2008) 258-261.

DOI: 10.1016/j.cap.2007.08.002

Google Scholar

[6] L.S. Cavalcante, J.C. Sczancoski, J.W.M. Espinosa, J.A. Varela, P.S. Pizani, E. Longo, Photoluminescent behaviour of BaWO4 powders processed in microwave-hydrothermal, J. Alloys Compd. 474 (2009) 195-200.

DOI: 10.1016/j.jallcom.2008.06.049

Google Scholar