Influence of crystallite size reduction on the magnetic and magnetocaloric properties of La0.6Sr0.35Ca0.05CoO3 nanoparticles

Polyhedron ◽  
2017 ◽  
Vol 121 ◽  
pp. 19-24 ◽  
Author(s):  
R. Tlili ◽  
M. Bejar ◽  
E. Dhahri ◽  
A. Zaoui ◽  
E.K. Hlil ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Size Reduction ◽  
Magnetocaloric Properties

Effects of size reduction on the magnetic and magnetocaloric properties of NdMn2Ge2nanoparticles prepared by high-energy ball milling

2014 ◽  
Vol 252 (1) ◽  
pp. 192-197 ◽  
Author(s):  
Melike Kaya ◽  
Majid Rezaeivala ◽  
Ercüment Yüzüak ◽  
Selcuk Akturk ◽  
Ilker Dincer ◽  
...  
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Size Reduction ◽  
Magnetocaloric Properties ◽  
Energy Ball

Ferroelectric phase coexistence by crystallite size reduction inBiFeO3−PbTiO3

2014 ◽  
Vol 90 (15) ◽  
Author(s):  
V. Kothai ◽  
Bastola Narayan ◽  
Kumar Brajesh ◽  
S. D. Kaushik ◽  
V. Siruguri ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Ferroelectric Phase ◽  
Phase Coexistence ◽  
Size Reduction

scholarly journals Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

2021 ◽  
Vol 127 (9) ◽  
Author(s):  
Anita D. Souza ◽  
Megha Vagadia ◽  
Mamatha D. Daivajna
Keyword(s):  
Particle Size ◽  
Finite Size ◽  
Entropy Change ◽  
Bulk Sample ◽  
Size Reduction ◽  
Magnetic Interactions ◽  
Ferromagnetic Transition ◽  
Particle Size Reduction ◽  
Magnetic Correlations ◽  
Magnetocaloric Properties

AbstractThe effect of particle size reduction on the magnetic correlations of Pr0.4Bi0.2Sr0.4MnO3 nanoparticles prepared by top-down approach has been studied in detail. It was observed that as the milling time increases from 0 to 240 min, particle size decreases from 160 to 12 nm. Correspondingly it was observed that the ferromagnetic transition temperature (TC) drops (264 to 213 K) and saturation magnetization (MS) decreases (2.12–0.41 $${\upmu }_{\mathrm{B}}/\mathrm{f}.\mathrm{u}.$$ μ B / f . u . ) while coercivity (HC) shows a monotonous increase (0.18–1.5 kOe) as the particle size decreases due to increase in milling. The magnetic entropy change (ΔS) also decreases (2.41–0.24 J/kg-K) as particle size decreases indicating a strong correlation between magnetism and particle size. The metamagnetic M–H response of the bulk sample, which signifies the magnetic phase coexistence, is suppressed, and the nature of magnetic interactions demonstrates a transition from long range to short range. The observed characteristics emphasizes that with particle size reduction there is an increase in the surface disorder which can be explained by considering the core–shell model for the nanoparticles. Graphic abstract

Direct Observation of Crystalline Ordering In Naturally Graphitized Carbon Produced by Low Grade Metamorphism

1977 ◽  
Vol 35 ◽  
pp. 162-163
Author(s):  
Thomas R. McKee ◽  
Peter R. Buseck
Keyword(s):  
Crystallite Size ◽  
Sedimentary Rocks ◽  
Carbonaceous Material ◽  
Low Grade ◽  
X Ray ◽  
Graphitized Carbon ◽  
Transmission Electron ◽  
Heat Treated ◽  
Commercial Carbon ◽  
Metamorphic Zone

Sediments commonly contain organic material which appears as refractory carbonaceous material in metamorphosed sedimentary rocks. Grew and others have shown that relative carbon content, crystallite size, X-ray crystallinity and development of well-ordered graphite crystal structure of the carbonaceous material increases with increasing metamorphic grade. The graphitization process is irreversible and appears to be continous from the amorphous to the completely graphitized stage. The most dramatic chemical and crystallographic changes take place within the chlorite metamorphic zone.The detailed X-ray investigation of crystallite size and crystalline ordering is complex and can best be investigated by other means such as high resolution transmission electron microscopy (HRTEM). The natural graphitization series is similar to that for heat-treated commercial carbon blacks, which have been successfully studied by HRTEM (Ban and others).

Effect of the structural changes on the mechanical properties of the sintered films

2016 ◽  
Vol 12 (1) ◽  
pp. 4141-4144
Author(s):  
Garima Jain
Keyword(s):  
Crystallite Size ◽  
Lattice Constant ◽  
Structural Changes ◽  
Structural Investigation ◽  
Energy Gap ◽  
Lattice Parameter ◽  
Metal Chalcogenides ◽  
Optical Energy Gap ◽  
Tin Telluride ◽  
Physical Quantities

Polycrystalline films of tin telluride were prepared by sintering technique. The structural investigation of the films with different thicknesses enables to determine lattice parameter, crystallite size and strain existing in the films. The XRD traces showed that strain was tensile in nature. The crystallite size increases with thickness while strain decreases. Higher the value of tensile strain, larger is the lattice constant. The optical energy gap shows a descending nature with increasing strain and so with the lattice constant. Such an attempt made to delve into interdependence of basic physical quantities helps to explore the properties of SnTe and utilize it as an alternative to heavy metal chalcogenides in various technological applications.  

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