António Pereira Gonçalves

Dr. António Pereira Gonçalves

C2TN, Department of Nuclear Sciences and Engineering (DECN), Instituto Superior Técnico (IST), Universidade de Lisboa, Portugal
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Research Focus & Metrics

Academic Career Length

39Years (1988-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 May 1988 in Physical Review B
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Journal Article
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António Pereira GonçalvesAntónio Pereira Gonçalves
António Pereira Gonçalves
ISIsabel Cordeiro Santos
Isabel Cordeiro Santos
ELElsa B Lopes
Elsa B Lopes
RHR. T. Henriques
R. T. Henriques
MAManuel Almeida
Manuel Almeida
MFMaria-Ondina Figueiredo
Maria-Ondina Figueiredo
The oxides with composition Y1−x Prx Ba2(Cu3 O7−δ)(0≤x≤1) 7-δ (0≤x≤1) are characterized by x-ray diffraction, resistivity (ρ) and thermoelectric power (S) measurements. X-ray diffraction shows an orthorhombically distorted perovskite structure for all compositions, the pseudotetragonality increasing with x. The substitution of the tetravalent Pr for the trivalent Y atom increases the band filling in these materials. As a consequence, the superconducting transition temperature is progressively decreased with increasing x, and S significantly increases. Thermopower and resistivity measurements indicate that these oxides have relatively narrow bands and that the electronic correlations dominate their properties.

19 February 2014 in The European Physical Journal B
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António Pereira GonçalvesAntónio Pereira Gonçalves
António Pereira Gonçalves
CGClaude Godart
Claude Godart

1 January 1990 in Hydrometallurgy
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Journal Article
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ISIsabel Cordeiro Santos
Isabel Cordeiro Santos
António Pereira GonçalvesAntónio Pereira Gonçalves
António Pereira Gonçalves
CSC.SIlva Santos
C.SIlva Santos
MAManuel Almeida
Manuel Almeida
MAM.H Afonso
M.H Afonso
MCM.JOaquina Cruz
M.JOaquina Cruz

23 December 2009 in Journal of Materials Chemistry
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António Pereira GonçalvesAntónio Pereira Gonçalves
António Pereira Gonçalves
ELElsa B Lopes
Elsa B Lopes
OROlivier Rouleau
Olivier Rouleau
CGClaude Godart
Claude Godart
Recent approaches to improve performance of bulk thermoelectric (TE) materials show that they should have complex structures, include inclusions and impurities, possess mass fluctuations, disorder and be based on heavy elements. Glasses can possess these properties. In order to identify glasses with interesting TE potential, attention should be focused on small gap semiconducting or semimetallic glasses. Chalcogenide glasses with Cux+yGe20−xTe80−y (0 ≤ x ≤ 20; 0 ≤ y ≤ 10) compositions were prepared by melt spinning. Their powder X-ray diffraction analyses point to a short-range order analogous to Ge20Te80 , with Cu atoms most likely replacing Ge atoms in the GeTe4 structural unit. It also indicates, together with the differential scanning calorimetry results, a reduction in the glass stability with the increase in Cu concentration. The enhancement of Cu content dramatically reduces (five orders of magnitude) the electrical resistivity, while keeping the Seebeck coefficients at large values (∼400 μV K−1 ). As a consequence, a huge increase in the power factor is observed, up to a maximum value of 60 μW K−2 m−1 for the Cu27.5Ge2.5Te70 glass at T = 300 K. Ge20Te80 has extremely low lattice thermal conductivity values (∼0.1 W K−1 m−1 at 300 K), which points to relatively high values for the figure of merit ZT for this family of glasses, and indicates Cux+yGe20−xTe80−y based glasses as good candidates for obtaining high performance thermoelectric materials.

12 June 2009 in Journal of Raman Spectroscopy
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CMCatarina Miguel
Catarina Miguel
ACAna Claro
Ana Claro
António Pereira GonçalvesAntónio Pereira Gonçalves
António Pereira Gonçalves
VMVânia S. F. Muralha
Vânia S. F. Muralha
MMMaria J. Melo
Maria J. Melo

26 May 2010 in Journal of the American Chemical Society
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Journal Article
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XWXuefeng Wang
Xuefeng Wang
LALester Andrews
Lester Andrews
PMPer-Åke Malmqvist
Per-Åke Malmqvist
BRBjörn O. Roos
Björn O. Roos
António Pereira GonçalvesAntónio Pereira Gonçalves
António Pereira Gonçalves
BVBenjamin Villeroy
Benjamin Villeroy