Correlation between electron state density change and the electrical resistivity and magnetic permeability changes in the nanostructured powder of the NiMo alloy

Ribić-Zelenović, Lenka; Rafailović, Lidija D.; Spasojević, M.; Maricic, A.

doi:10.1016/j.physb.2007.11.024

Cited by 21 publications

(34 citation statements)

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“…Structural changes affect mechanical, electrical, and magnetic 2 Journal of Nanomaterials properties, catalytic activity, thermal stability, and corrosion resistance [8-15, 28, 30]. Structural changes in nanostructured alloys also lead to changes in the value of the thermoelectromotive force of the nanostructured alloy-crystal alloy (metal) thermocouple [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…This substantial change indicates that 6 Journal of Nanomaterials intense structural relaxation takes place in the alloy during annealing at 360 ∘ C. The intense structural relaxation and the increase in electron numbers in the conduction zone in the temperature range of 150 ∘ C to 360 ∘ C cause a decrease in the coefficient of electrical resistivity. It is likely that the dipole moment ⃗ becomes more uniformly oriented for certain nanoparticles in certain electronic states [34,[36][37][38].…”

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confidence: 99%

“…where → el is the dipole moment's electronic part, which is less dependent on temperature, and → ph is the phonon part, which is more sensitive to temperature as bosons are sensitive to anharmonic electron-phonon and electronmagnon interactions [34,[36][37][38].…”

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confidence: 99%

“…Crystallization and crystal grain growth cause an increase in the mean free path of electrons in the conduction band and an increase in the electron density of states at the Fermi level, resulting in increased electrical conductivity of the alloy [17,19,20,34,36].…”

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confidence: 99%

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Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni_85.8Fe_10.6W_1.4Cu_2.2 Alloy

Spasojević¹,

Maricic²,

Vuković³

et al. 2017

Journal of Nanomaterials

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Cu 2.2 alloy powder containing nanocrystals of an FCC-structured solid solution of iron, tungsten, and copper in nickel embedded in an amorphous matrix was electrodeposited from an ammonia citrate solution. The alloy exhibits thermal stability in the temperature range between 25 ∘ C and 150 ∘ C. Over the range 150−360 ∘ C, the alloy undergoes intense structural relaxation which considerably increases the electron density of states and, hence, its electrical conductivity. Less intense structural relaxation takes place at temperatures between 360 ∘ C and 420 ∘ C. In the temperature range of 420 ∘ C to 460 ∘ C, relatively more intense changes in the electron density of states at the Fermi level occur, as induced by the structural relaxation resulting from the stabilization of larger less mobile tungsten atoms and copper atoms. The large decrease in electrical resistivity and the high increase in the electron density of states at the Fermi level in the temperature range 460−520 ∘ C are due to amorphous matrix crystallization and FCC-phase crystal grain growth.

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Section: Introductionmentioning

confidence: 99%

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Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni_85.8Fe_10.6W_1.4Cu_2.2 Alloy

Spasojević¹,

Maricic²,

Vuković³

et al. 2017

Journal of Nanomaterials

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“…Seebeck-ovog koeficijenta α. Uz pretpostavku da se gustina stanja elektrona u bakru ne menja tokom zagrevanja, očigledno je da je promena α uzrokovana samo promenom gustine stanja elektrona u amorfnom delu termopara [66,67].…”

Section: Merenje Magnetne Susceptibilnosti Po Modifikovanoj Faraday-eunclassified

The structural relaxation effect on functional properties of Fe - based amorphous alloys

Kalezić-Glišović¹

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REZIMEIspitivan je uticaj strukturnih promena izazvanih primenom spoljašnjih parametara (toplotno dejstvo, magnetno dejstvo, mehaničko naprezanje) u toku procesa strukturne relaksacije i kristalizacije na funkcionalna svojstva tri legure na bazi gvožđa, različitog hemijskog sastava: Strukturna stabilnost i strukturne transformacije legura ispitane su primenom difrakcije Xzraka. Pokazana je egzotermna termička stabilnost ispitivanih legura u temperaturskom intervalu od 20 0 C -700 0 C, primenom diferencijalne skanirajuće kalorimetrije (DSC). Ovaj temperaturski interval obuhvata relaksaciju deformisane strukture, gubitak feromagnetičnosti i konačno kristalizaciju, rekristalizaciju i rast kristala formiranih faza. Proces kristalizacije obuhvata formiranje različitih stabilnih i nestabilnih faza u zavisnosti od hemijskog sastava ispitivanih legura.Ispitana je kinetika procesa strukturne relaksacije ovih legura, pri različitim naprezanjima i temperaturama odgrevanja. Zatim je ispitan uticaj strukturne relaksacije na promenu gustine stanja elektrona na Fermi-evom nivou. Pokazano je da strukturne promene imaju velikog uticaja na električna i magnetna svojstva ovih legura. Utvrđeno je da relaksirana amorfna struktura legure poseduje znatno bolja električna i magnetna svojstva kako u odnosu na polaznu leguru, tako i u odnosu na iskristalisalu leguru sa stanovišta mogućnosti praktične primene. Takođe je ispitana i mogućnost primene ovih legura kao senzora sile.Uspostavljena je jasna korelacija strukturne promene -funkcionalna svojstva i dato fundamentalno tumačenje međuzavisnosti strukturna relaksacija -promena gustine stanja elektrona na Fermi-evom nivou -električna svojstva -magnetna svojstva, što je i cilj ove disertacije.Ključne reči: amorfne metalne legure, melt-spinning, DSC, difrakcija X-zračenja, strukturna relaksacija, toplotno dejstvo, mehaničko naprezanje, električna svojstva, gustina stanja elektrona na Fermi-evom nivou, magnetna svojstva. were obtained by rapidly quenching of the melt on a rotating disk (melt-spinning technique). The samples were ribbon-shaped, 20 cm long, 2 mm wide and 3 μm thick.The structural stability and structural transformations of the alloys were investigated by Xray diffraction. Exothermal stability of the investigated alloys in the temperature range from 20 0 C to 700 0 C was determined, by the differential scanning calorimetry method (DSC). This temperature range presumes relaxation of deformed structure, the loss of ferromagnetic properties and finally crystallization, recrystallization and growth of the crystallites of formed phases. The crystallization process includes the formation of various stable and unstable phases depending on the chemical content of the investigated alloys. The kinetics of the structural relaxation process of these alloys

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Influence of indium and selenium co-doping on structural and thermoelectric properties of Bi2Te3 alloys

Hegde

Prabhu

Chattopadhyay

2023

J Mater Sci: Mater Electron

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The melt-grown, indium and selenium co-doped Bi2Te3 single-crystal system is studied with a purpose to improve and analyze the thermoelectric performance in the low and near room-temperature range (10–400 K). The influence of co-dopants on the crystalline perfection, symmetry, dislocation, and single-crystal quality is investigated using high-resolution X-ray diffraction. The surface morphological features show the existence of small-angle grain boundaries, white patches, and tilt boundaries. Degenerate type of semiconducting behavior is seen in all the samples over the entire temperature range. The existence of small polarons is experimentally inferred from temperature-dependent electrical resistivity. Measurement of Seebeck coefficient confirms p- to n-type transition in the crystals doped with indium and selenium. The total thermal conductivity at 11 K was decreased by 3.4 times in (Bi0.98In0.02)2Te2.7Se0.3 as compared to pristine sample. Therefore, this novel co-doped indium and selenium Bi2Te3 single-crystal combination is viable to use as a competitor for low and near-room-temperature thermoelectric applications.

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Correlation between electron state density change and the electrical resistivity and magnetic permeability changes in the nanostructured powder of the NiMo alloy

Cited by 21 publications

References 20 publications

Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni_85.8Fe_10.6W_1.4Cu_2.2 Alloy

Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni_85.8Fe_10.6W_1.4Cu_2.2 Alloy

The structural relaxation effect on functional properties of Fe - based amorphous alloys

Influence of indium and selenium co-doping on structural and thermoelectric properties of Bi2Te3 alloys

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Correlation between electron state density change and the electrical resistivity and magnetic permeability changes in the nanostructured powder of the NiMo alloy

Cited by 21 publications

References 20 publications

Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni85.8Fe10.6W1.4Cu2.2 Alloy

Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni85.8Fe10.6W1.4Cu2.2 Alloy

The structural relaxation effect on functional properties of Fe - based amorphous alloys

Influence of indium and selenium co-doping on structural and thermoelectric properties of Bi2Te3 alloys

Contact Info

Product

Resources

About

Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni_85.8Fe_10.6W_1.4Cu_2.2 Alloy

Effect of Microstructural Changes during Annealing on Thermoelectromotive Force and Resistivity of Electrodeposited Ni_85.8Fe_10.6W_1.4Cu_2.2 Alloy