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Enhanced magnetoelastic performance in Pr/Mn-doped Laves phase (Tb,Ho)Fe2 compounds

Wang M. K., Liu J. J., Lv X. J., Ding Q. L., Li F., Pan Z. B., Xia W. X., Du J.

Materials Science Poland

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2020

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Vol. 38, No. 4

707--714

EN

Magnetostrictive TbxHo0.8−xPr0.2Fe1.8Mn0.1 (0 ⩽ x ⩽ 0.20) alloys are prepared by arc-melting and subsequent annealing. The dopant of Pr/Mn introduced into RFe2 compounds effectively stabilizes the forming of single C15 Laves phase at ambient pressure. The easy magnetization direction (EMD) varies when Tb content increases, which is accompanied by a crystalstructural transition. EMD lies along ‹1 0 0› axis for x ⩽ 0.05, rotating to ‹1 1 1› axis for x ⩽ 0.12, with a tetragonal symmetry changing to a rhombohedral one. Magnetocrystalline-anisotropy compensation is obtained with the optimized composition of x = 0.12, shifting to the Tb-poor side in comparison to Pr/Mn-free counterpart. An enhanced effect on magnetoelastic properties is achieved in Tb0.12Ho0.68Pr0.2Fe1.8Mn0.1, which simultaneously possesses a low anisotropy and high magnetostriction performance, i.e. λs ~ 420 ppm, λ111 ~ 970 ppm, and a large low-field λa ~ 390 ppm/2 kOe, being 30 % higher than that of Pr/Mn-free compound. Combining low-cost light rare earth Pr with the lower Tb content, Tb0.12Ho0.68Pr0.2Fe1.8Mn0.1may make it promising solution in magnetostrictive applications.

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Effect of deposition temperature on structural, optical and electrical properties of copper bismuth sulphide (CuBiS2) thin films deposited by chemical bath deposition

Balasubramanian V., Kumar P. N., Sengottaiyan D.

Materials Science Poland

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2017

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Vol. 35, No. 2

329--334

EN

The effect of deposition temperature on the structural, optical and electrical properties of copper bismuth sulphide (CuBiS2) thin films deposited by chemical bath deposition onto glass substrates at different deposition temperatures (40 °C, 50 °C, 60 °C and 70 °C) for 5 hours deposition time period was investigated. The obtained films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and optical absorption spectra. All deposited films were polycrystalline and had an orthorhombic structure. Their grain size had changed with deposition temperature and their compositions were nearly stoichiometric. The optical band gap value was decreased from 2.44 eV to 2.33 eV with increasing the film thickness. Electrical parameters such as mobility and type of electrical conduction were determined from the Hall effect measurements. They showed that the obtained films have n-type conductivity and mobility values of the copper bismuth sulphide (CuBiS2) films have changed with deposition temperature.

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Thermal stability of the Cu/Ni multilayer system in X-ray diffraction and scanning microscopy examinations

Kucharska B., Kulej E., Wróbel A.

Optica Applicata

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2012

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Vol. 42, nr 4

725--736

EN

The article presents the results of research into the effect of heating on the stability of a Cu/Ni multilayer applied onto a Si(100) substrate by the magnetron sputtering method. The multilayer was heated in a furnace atmosphere in a temperature range of 40–230 °C. The X-ray structural examination by the X-ray diffraction (XRD) and the grazing X-ray incidence diffraction (GIXRD) methods and microscopic observations of the multilayer surface were carried out. Structural changes were found to occur under the influence of heating due to the mutual diffusion of Cu and Ni, resulting in a loss of the multilayer nature of the structure. Early indications of a surface discontinuity of the multilayer, as noticed in microscopic observations and then confirmed by X-ray measurements, were found at a temperature of 220 °C. At higher temperatures, intensive delamination of the multilayer from the silicon substrate followed as a result of thermal stresses caused by a large difference in the thermal expansion coefficients between the multilayer and silicon.

4

Synthesis in aqueous phase and characterization of silver nanorods and nanowires

Zhou J., Zhou G., Wang R., Lu M.

Materials Science Poland

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2009

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Vol. 27, No. 1

73--78

EN

Silver nanorods and nanowires have been synthesized via a chemical process in aqueous phase by using ascorbic acid as a reducing agent and anionic surfactant dodecyl benzene sulfonic acid sodium (SDBS) as a capping agent. The products were characterized by X-ray diffraction (XRD) techniques and transmission electron microscopy (TEM). Experimental results indicated that the concentration of ascorbic acid played a critical role in the formation of the silver nanorods and nanowires. The optical properties were investigated. The prepared nanostructures displayed a very strong absorption band at room temperature.