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X‐ray powder diffraction (XRD) diffractogram of the Cu10Zr7 sample before and after heating up to 1373 K. The Secondary Electrons (SE) mode enabled us to observe how the surface of each single grain was attacked by oxygen, forming an almost 10 μm‐thick layer of oxide (estimated from lateral view
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A new copper–zirconium oxide was synthesized at ambient pressure in air during a thermal treatment. Its crystal structure was analyzed using X-ray Powder Diffraction, and the atomic ratio between copper and zirconium was found performing a Rietveld analysis. An accurate analysis, also comparing this new compound with others present in the literatur...
Citations
... ZrO2 has been investigated for various chemical applications such as physical, optical, and mechanical properties, including high melting point, high resistivity, excellent chemical stability, low electrical conductivity, and biocompatibility, which can be used as a catalyst by doping with other elements. Scientists have often investigated the effect of secondary metal oxides added to ZrO2, such as Tb, Au, Al, Ti, Ag, Cu, etc. [12]- [16]. ...
CuO/ZrO2 composite systems were synthesized in two different ways and comprehensively characterized with X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), transmission electron microscopy(TEM), and energy dispersive X-ray spectroscopy(EDX). These metal oxide samples were prepared by hydrothermal synthesis and electrospinning process. In these methods, the same metal salts were used as precursors. Separately produced ZrO2 nanoparticles(NPs) and CuO particles have spherical and cube-like shapes, and both morphologies have monoclinic structures. However, ZrO2 and CuO particles do not have uniform diameters, and the average size of these particles ranges between 6–17 and 215–847 nm, respectively. Moreover, CuO/ZrO2 nanocomposite particles(NCPs) were synthesized using a facile and one-pot hydrothermal technique. They have uniform, spherical, and monoclinic structures with a 15nm average diameter. Furthermore, ZrO2 fibers were produced with the electrospinning process as highly crystalline structures after annealing, with a 230 nm average fiber diameter. In addition, ZrO2 fibers were doped with hydrothermally synthesized CuO particles with a drop-casting method for the first time. This study clearly shows that particle-fiber structure allows the development of the efficiency of p-type counterparts by using only 0.5-1.5wt.% n-type. With these results, two methods can be used to produce heterostructure CuO/ZrO2 composite particles/fibers and as potential for photocatalytic degradation.
... strong diffraction peak obtained at 2 θ = 39.25 • was ascribed to the Ti 2 Cu phase since it contained the highest titanium amount compared to other phases. All the reflections exhibited in an X-ray diffractogram were indexed in accordance with the earlier studies reported [27][28][29][30][31][32][33]. Therefore, the formed phases in Ti 50 Cu 30 Zr 15 B 5 alloy were orthorhombic Cu 10 Zr 7 , hexagonal TiB, and tetragonal Ti 2 Cu, respectively. ...
The significance of radiation shielding is on the rise due to the expanding areas exposed to radiation emissions. Consequently, there is a critical need to develop metal alloys and composites that exhibit excellent capabilities in absorbing neutron and gamma rays for effective radiation shielding. Low-density Ti-based alloys with controlled structural properties can be used for radiation protection purposes. The present research investigates boron-doped Ti-based alloy, Ti50Cu30Zr15B5, which is synthesized by arc melting technique, and its structural, mechanical properties, neutron, and gamma-ray transmission rate were investigated. Monte Carlo N-Particle simulation (MCNP6.2) code is used for calculating the Thermal (2.53 × 10⁻⁸ MeV) and fast (2 MeV) neutron transmission ratio (I/I0) dependent on the sample thickness. The Phy-x program is employed for calculating the gamma-ray LAC, MAC, HVL, TVL, and MFP values. The calculated neutron shielding performance parameters of Ti50Cu30Zr15B5 alloy were compared with materials in the literature. It was found that Ti50Cu30Zr15B5 alloy demonstrated impressive physical characteristics, suggesting that it can serve as a promising alloy for neutron and gamma-ray shielding applications.
... Copper and its alloys are widely used in automobile, electronic, and electric power industries due to their high strength, high thermal and electrical conductivity, and good ductility, as well as because they can be easily shaped [1][2][3][4][5][6]. To satisfy applications in the frame materials in large-scale integrity circuits, besides the requirement of high strength and high electrical conductivity, excellent recrystallization resistance is also needed. ...
... Cu-Cr-Zr might be able to satisfy these requirements. Extensive literature is available on the microstructures, physical properties, and mechanical properties of Cu-Cr-Zr alloys [6][7][8][9][10][11][12][13]. From the literature, cold working and aging treatment are considered to be the two most important materials-processing techniques for Cu-Cr-Zr alloys. ...
In this paper, the precipitation, recrystallization, and evolution of twins in Cu-Cr-Zr alloy strips were investigated. Tensile specimens were aged at three different temperatures for various times so as to bring the strips into every possible aging condition. The results show that the appropriate aging parameter for the 70% reduced cold-rolled alloy strips is 723 K for 240 min, with a tensile strength of 536 MPa and an electrical conductivity of 85.3% International Annealed Copper Standards (IACS) at the peak aged condition. The formation of fcc (face-centered cubic) ordered Cr-rich precipitates (β′) is an important factor influencing the significant improvement of properties near the peak aged condition. In terms of crystallographic orientation relationships, there are basically two types of β′ precipitates in the alloy. Beyond the Cr-rich precipitates (β′(I)) formed during the early aging stages, which mimic a cube-on-cube orientation relationship (OR) with the matrix, another Cr-rich precipitate (β′(II)) is observed in the peak aged condition. β′(II) is coherent with the matrix, with the following ORs: [111]β′(II)//[100]Cu, {02-2}β′(II)//{02-2}Cu and [011]β′(II)//[211]Cu, {200}β′(II)//{-111}Cu. These precipitates have a strong dislocation and grain boundary pinning effect, which hinder the dislocation movement and crystal boundary migration, and eventually delay recrystallization and enhance the recrystallization resistance of the peak aged strips. During the subsequent annealing process, the transition phase β′ gradually loses the coherence mismatch and grows into a larger equilibrium phase of chromium with a bcc (body-centered cubic) structure (β), resulting in the reduction of the pinning effect to dislocations and sub-grains, so that recrystallization occurs. Annealing twins are formed during the recrystallization process to release the deformation energy and to reduce the drive force for interface migration, eventually hindering grain growth.
Copper matrix composites (CMC) with reinforcement of Graphite (Gr) and Nano Zirconium Oxide (ZrO2) is found more prominent composite material for various application such as automotive, aerospace, marine industry due to its elemental mechanical properties. In this paper, the mechanical properties of 90% Cu-10% Sn alloy were compared with different composition of nano ZrO2 and Graphite particulates. The mechanical properties like hardness, tensile and microstructural analysis was carried with SEM and EDS to observe homogeneous distribution of reinforcement particles in the matrix composites. After test, it was found that, Cu-Sn alloy with Gr and ZrO2 composite mixture of ultimate tensile strength and yield strength was higher and hardness of the copper alloy matrix can be improved by addition of nano ZrO2 particulates.
In the present work, undoped and Cu-doped ZrO2 nanoparticles with a different weight percentage of copper (0 to 0.05 wt%) are synthesized by sol–gel technique. From XRD analysis, the observed peaks corresponding to the plane match well with the JCPDS data of tetragonal ZrO2. Microstructural analysis shows that the average crystallite size decreases from 6.96 to 5.73 nm when the Cu content increases from 0 to 0.05 wt%. From FTIR analysis the peaks observed at 489 and 429 cm−1 confirm the tetragonal Zirconia. From the morphology, the shape of the synthesized nanoparticles is observed to be spherical and the average particle size (using ImageJ) is found to vary from 30 to 7.18 nm when the dopant concentration increases from 0 to 0.05 wt%. The presence of Zr, Cu, and O in the prepared samples are confirmed by EDS analysis. The optical analysis shows that the optical absorption is blue-shifted when Cu content increases from 0 to 0.05 wt% and it is attributed to the confinement of charge carriers. Bandgap (Eg) analysis shows the transitions are direct allowed and the Eg value increases from 3. 27 to 3. 35 eV when Cu content increases from 0 to 0.05 wt%. From PL analysis, the peak at 389 nm is attributed to the ionized oxygen vacancies (F and F centers) from CB. From the photocatalytic analysis, undoped and Cu-doped ZrO2 used as the catalyst for the degradation of Alizarin Yellow is found to be faster for 0.05 wt% of Cu-doped ZrO2 (S3) than undoped (S1) and 0.03 wt% of Cu-ZrO2 (S2) which is attributed to the crystallite size of the 0.05 wt% of Cu-doped ZrO2 nanoparticles.
