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  • Jez, Kinga  (6)
  • 1
    Online Resource
    Online Resource
    Preparation of Magnetic Composites Based on Bulk Amorphous Iron Alloys
    Revista de Chimie SRL ; 2019
    In:  Materiale Plastice Vol. 56, No. 4 ( 2019-12-30), p. 1008-1012
    Details
    In: Materiale Plastice, Revista de Chimie SRL, Vol. 56, No. 4 ( 2019-12-30), p. 1008-1012
    Abstract: Iron-based amorphous alloys are characterized by so-called soft magnetic properties. Unfortunately, the geometry of iron-based amorphous materials significantly limits the applicability of these materials. One way to expand the use of these materials is to make composites based on them. As part of this work, rapid-cooled alloys were produced using the injection casting method. On their basis, magnetic composites with the addition of a non-magnetic binder were produced. The results of the structure (XRD) and magnetic properties (VSM) tests of the produced materials are presented. The research results have shown that the decisive impact on the magnetic properties of composites is the fact of the separation of magnetic particles with a non-magnetic binder. In this case, the influence of exchange interactions is dominated by dipole interactions.
    Type of Medium: Online Resource
    ISSN: 0025-5289 , 2668-8220
    URL: Article
    DOI: 10.37358/MP.19.4.5299
    Language: English
    Publisher: Revista de Chimie SRL
    Publication Date: 2019
    detail.hit.zdb_id: 2487166-7
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  • 2
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    Light Transmittance by Organic Eyeglass Lenses According to their Class
    Revista de Chimie SRL ; 2018
    In:  Materiale Plastice Vol. 55, No. 3 ( 2018-9-30), p. 438-441
    Details
    In: Materiale Plastice, Revista de Chimie SRL, Vol. 55, No. 3 ( 2018-9-30), p. 438-441
    Abstract: The research concerns the transmission of electromagnetic waves with a wavelength corresponding to the visible part of the spectrum and part of the ultraviolet and infrared radiation range. Light transmittance through ocular lenses was tested using a UV-Vis spectrophotometer for the wavelength range 250-850 nm. Obtained results encourage reflection on the quality of the spectacle lenses produced. The obtained results do not confirm the assurances of producers about the increase in light transmittance in the range of wavelengths corresponding to the highest sensitivity of the human eye. In addition, lenses having UV protection coatings do not perform their function in a proper way. Eyeglass lenses of various classes were tested, equipped with various refining coatings. The effect of the number of coatings on the transmission of light through the lenses was not observed. Conducting and publishing studies such as those presented in this work may have a significant impact on the improvement of the quality of manufactured eyeglass lenses.
    Type of Medium: Online Resource
    ISSN: 0025-5289 , 2668-8220
    URL: Article
    DOI: 10.37358/MP.18.3.5046
    Language: English
    Publisher: Revista de Chimie SRL
    Publication Date: 2018
    detail.hit.zdb_id: 2487166-7
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  • 3
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    Online Resource
    Structural and Magnetic Properties of the Rapid Cooled Alloys: Fe60Co10Y5+xZr5-xB20 (Where: x = 0 or 2)
    Revista de Chimie SRL ; 2019
    In:  Revista de Chimie Vol. 70, No. 1 ( 2019-2-15), p. 224-227
    Details
    In: Revista de Chimie, Revista de Chimie SRL, Vol. 70, No. 1 ( 2019-2-15), p. 224-227
    Abstract: This article presents the results of tests on high-temperature alloys, produced on the basis of the FeCoB matrix. The nanocrystalline material was produced in a single-step process of rapid cooling of liquid alloy that was injected into a copper mould. Alloy samples were obtained in the form of 10mm x 5mm x 0.5mm tiles. Studies of the structure of the manufactured alloys were undertaken using Bruker X-ray analysis equipment (featuring a CuKa lamp). The magnetic polarization of saturation was measured, as a function of temperature, using a Faraday magnetic balance; the measurements ranged from room temperature up to 850K. Through numerical analysis of the curves, the Curie temperature of the investigated alloys was determined. Using a vibration magnetometer, static magnetic hysteresis loops were measured. The magnetization of saturation of the tested alloys was greater than 1 T, while the coercive field values were 400 and 16600 A/m. The stiffness parameter of the spin wave Dspf was determined.
    Type of Medium: Online Resource
    ISSN: 0034-7752 , 2668-8212
    URL: Article
    DOI: 10.37358/RC.19.1.6887
    Language: English
    Publisher: Revista de Chimie SRL
    Publication Date: 2019
    detail.hit.zdb_id: 2488208-2
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  • 4
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    Influence of the Process for Obtaining Massive Amorphous Materials on the Defects of the Structure in the Alloy Fe61+xCo10-xY8W1B20 , where x = 0 or 1
    Revista de Chimie SRL ; 2018
    In:  Revista de Chimie Vol. 69, No. 9 ( 2018-10-15), p. 2546-255
    Details
    In: Revista de Chimie, Revista de Chimie SRL, Vol. 69, No. 9 ( 2018-10-15), p. 2546-255
    Abstract: As part of the work, a rapid cooled alloy was produced with the chemical composition Fe61+xCo10-xY8W1B20, where: x = 0 or 1 using two methods, suction in and injecting the molten alloy into the copper mold. The material was obtained in the form of 10 mm x 5 mm x 0.5 mm plates. Studies on the structure of the obtained alloys were carried out using X-ray diffraction. Obtained X-ray diffraction images are typical for amorphous materials. Using the vibration magnetometer, static magnetic hysteresis loops and primary magnetization curves were measured. The produced samples are characterized by a saturation value above 1T and a coercive field value below 200 A/m. Based on the theory of H. Kronm�ller, numerical analysis of the curves of the original magnetization was carried out. It has been found that the process of magnetizing the produced materials has defects of the amorphous structure in the form of pseudo-location dipoles and free volumes. In addition, the spin wave stiffness parameter was determined.
    Type of Medium: Online Resource
    ISSN: 0034-7752 , 2668-8212
    URL: Article
    DOI: 10.37358/RC.18.9.6573
    Language: English
    Publisher: Revista de Chimie SRL
    Publication Date: 2018
    detail.hit.zdb_id: 2488208-2
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  • 5
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    Online Resource
    Influence of Isothermal Heating on the Curie Temperature of FeCoB Bulk Amorphous Alloy
    Revista de Chimie SRL ; 2019
    In:  Revista de Chimie Vol. 70, No. 9 ( 2019-10-15), p. 3158-3162
    Details
    In: Revista de Chimie, Revista de Chimie SRL, Vol. 70, No. 9 ( 2019-10-15), p. 3158-3162
    Abstract: The article presents the results of research on the thermal treatment of amorphous alloys. As part of the work, an alloy with a chemical composition Fe63Co8Y8W1B20 was produced by rapid cooling. The method used to aspirate the liquid alloy into the copper mold was used. The produced material was subjected to annealing at 940K for 10 minutes. The alloy, after solidification and after heat treatment, was subjected to structure testing by means of X-ray diffraction. The soaking process led to the partial crystallization of the amorphous precursor. Using the Faraday magnetic balance, curves of the magnetic saturation polarization as a function of temperature were recorded, on the basis of their analysis, the Curie temperature of the produced materials was determined. Using the vibration magnetometer, the primary curves of magnetization and static magnetic hysteresis loops were measured. The alloy after the soaking process was characterized by higher Curie temperature and magnetically hard properties. The test results confirm the possibility of modifying the magnetic properties of high-temperature alloys through a suitably designed heat treatment.
    Type of Medium: Online Resource
    ISSN: 0034-7752 , 2668-8212
    URL: Article
    DOI: 10.37358/RC.19.9.7507
    Language: English
    Publisher: Revista de Chimie SRL
    Publication Date: 2019
    detail.hit.zdb_id: 2488208-2
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  • 6
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    Online Resource
    The Influence of the Manufacturing Method on the Structure and Magnetic Properties of Rapid Cooled Iron Based Alloys
    Revista de Chimie SRL ; 2018
    In:  Revista de Chimie Vol. 69, No. 6 ( 2018-7-15), p. 1593-1597
    Details
    In: Revista de Chimie, Revista de Chimie SRL, Vol. 69, No. 6 ( 2018-7-15), p. 1593-1597
    Abstract: The studies include the production of an amorphous alloy with the chemical composition Fe62Co9Y8W1B20 by two methods: injection and suction casting while maintaining similar production parameters (such as: chamber pressure, protective gas) and comparison of their structure and magnetic properties. The alloy was examined for structure by X-ray diffraction. The magnetic properties were determined on the basis of the VSM and the Faraday magnetic balance measurements. Solid amorphous iron-based materials are characterized by good magnetic properties. The influence of the method of production on these properties turns out to be significant, especially in the case of coercive field. The obtained results lead to further research on massive iron-based amorphous materials. Future research will address the effect of changes in the chemical composition of the alloy on magnetic properties and the continuation of studies on the impact of the manufacturing method on the structure and properties of alloys. The obtained alloy is characterized by good soft magnetic properties. It is possible to use it in electronics and electrotechnics, especially in devices where easy remagnetization of the material at specific frequencies is required.
    Type of Medium: Online Resource
    ISSN: 0034-7752 , 2668-8212
    URL: Article
    DOI: 10.37358/RC.18.6.6376
    Language: English
    Publisher: Revista de Chimie SRL
    Publication Date: 2018
    detail.hit.zdb_id: 2488208-2
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