Manuel Valente

Prof. Manuel Valente

I3N, Department of Physics, University of Aveiro, Santiago Campus, 3810-193 Aveiro, Portugal
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Research Focus & Metrics

Academic Career Length

36Years (1991-Present)

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

Representative Publications

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16 February 2016 in Materials Research
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Journal Article
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STShweta Thakur
Shweta Thakur
RRRadheshyam Rai
Radheshyam Rai
Igor BdikinIgor Bdikin
Igor Bdikin
Manuel ValenteManuel Valente
Manuel Valente
In this paper we present the impedance spectroscopy of ternary solid solutions of BiFeO3, TbFeO3 and PbTiO3, prepared by solid-state reaction method. The preliminary structural studies were carried out by x-ray diffraction technique, showing the formation of polycrystalline sample with ABO3 type of perovskite structure with hexagonal symmetry for Bi0.8Tb0.1Pb0.1Fe0.9Ti0.1O3system at room temperature. Dielectric and impedance study of this ceramic has been characterized in the temperature range 175 - 325 0C and frequency range 100 Hz - 1 MHz. The maximum ferroelectric transition temperature (Tc) of this system was in the range 210 - 225 0C with the dielectric constant having maximum value ~2480 at 1 kHz. The complex impedance graph exhibited one impedance semicircle arc at all reported temperatures, which indicates that the impedance response is a Cole-Cole type relaxation. Single semicircle indicate that the grain effect of the bulk in ceramic. The bulk resistance of the material decreases with increasing temperature showing negative temperature showing a typical semiconducting property, i.e. negative temperature coefficient of resistance (NTCR) behavior.

1 November 2011 in Applied Thermal Engineering
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Journal Article
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TST. Santos
T. Santos
Manuel ValenteManuel Valente
Manuel Valente
JMJ. Monteiro
J. Monteiro
JSJ. Sousa
J. Sousa
Luis CostaLuis Costa
Luis Costa

1 March 2013 in Journal of Alloys and Compounds
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Journal Article
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Manuel Pedro Fernandes GraçaManuel Pedro Fernandes Graça
Manuel Pedro Fernandes Graça
AMA. Meireles
A. Meireles
CNC. Nico
C. Nico
Manuel ValenteManuel Valente
Manuel Valente

1 January 2017 in Separation and Purification Technology
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Journal Article
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SGSourav Gautam
Sourav Gautam
PSPooja Shandilya
Pooja Shandilya
BPBhanu Priya
Bhanu Priya
VSVirender Pratap Singh
Virender Pratap Singh
PRPankaj Raizada
Pankaj Raizada
PSPardeep Singh
Pardeep Singh

1 September 2012 in Journal of Alloys and Compounds
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Journal Article
Closed access
AOA. Omri
A. Omri
MBM. Bejar
M. Bejar
SDSebti Dhahri
Sebti Dhahri
MEM. Es-Souni
M. Es-Souni
Manuel ValenteManuel Valente
Manuel Valente
Luis CostaLuis Costa
Luis Costa

1 July 2015 in Journal of Alloys and Compounds
Verified
Journal Article
Closed access
ADAh. Dhahri
Ah. Dhahri
MJM. Jemmali
M. Jemmali
SDSebti Dhahri
Sebti Dhahri
Manuel ValenteManuel Valente
Manuel Valente