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Journal articles on the topic 'Mossbauer spectroscopy'

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Published: 4 June 2021

Last updated: 28 July 2024

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1

Kamzin A. S., Obaidat I. M., Semenov V. G., Narayanaswamy V., Al-Omari I. A., Issa B., and Buryanenko I. V. "Structure and properties of Co-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Fe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticles depending on the amount of Co ions (0≤ x≤ 1.0)." Physics of the Solid State 64, no. 6 (2022): 714. http://dx.doi.org/10.21883/pss.2022.06.53838.298.

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The properties of magnetic nanoparticles (MNPs) of spinel ferrites CoxMn1-xFe2O4 (at x=0.0; 0.2; 0.3; 0.4; 0.5; 0.6; 0.8; 1.0) synthesized by chemical co-precipitation method have been studied. The studies of the synthesized CoxMn1-xFe2O4 MNPs were carried out using X-ray diffraction (XRD), Raman scattering and Mossbauer spectroscopy. The results of XRD, Raman and Mossbaur studies indicate that the obtained CoxMn1-xFe2O4 MNPs are single-phase. It was established from XRD measurements that the average size of CoxMn1-xFe2O4 crystallites is 34.86 nm for MnFe2O4 (x=0) and decreases to 14.99 nm for CoFe2O4 (x=1.0) with increasing Co ions concentration. An analysis of the Mossbaur spectra showed that the average crystallite size varies from 25 nm for MnFe2O4 (x=0) to 12 nm for CoFe2O4 (x=1.0). On the Raman spectra of CoxMn1-xFe2O4 MNPs, in the region of ~620 cm-1, splitting of the A1g line is observed, which means that the studied MNPs have a reverse spinel structure. The intensity ratio of the A1g (1) and A1g (2) peaks indicates a significant redistribution of the Co2+ and Fe3+ cations between tetra- and octahedralpositions in MNPs of the CoxMn1-xFe2O4 ferrite, which is confirmed by Mossbauer data. Mossbaur spectroscopy data indicate that the synthesized CoxMn1-xFe2O4 MNPs consist of large particles with magnetic ordering and small particles in the paramagnetic phase. With an increase in the concentration of Mn ions, the proportion of fine particles increases, which leads to a decrease in the magnetic blocking temperature. The saturation magnetization of MNPs at x=0.2 (Co0.2Mn0.8Fe2O4) is 57.41 emu/g and this sample, as was found in [V. Narayanaswamy, I.A. Al-Omari, A.S. Kamzin, B. Issa, H.O. Tekin, H. Khourshid, H. Kumar, A. Mallya, S. Sambasivam, I.M. Obaidat. Nanomaterials 11, 1231 (2021)] has the highest specific absorption rate. As shown by Mossbauer studies, this is due to the fact that these particles are in a superparamagnetic state and the magnetic blocking temperature of these MNPs is in the region of ~315 K, which is most suitable for the treatment of malignant tumors by magnetic hyperthermia. Thus, the synthesized CoxMn1-xFe2O4 MNPs are promising for biomedical applications. Keywords: spinel ferrites CoxMn1-xFe2O4, magnetic structure, superparamagnetism, Mossbauer spectroscopy, materials for biomedicine.

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2

Fruchart, R., P. L'Heritier, P. Dalmas de Reotier, D. Fruchart, P. Wolfers, J. M. D. Coey, L. P. Ferreira, R. Guillen, P. Vulliet, and A. Yaouanc. "Mossbauer spectroscopy of R2Fe14B." Journal of Physics F: Metal Physics 17, no. 2 (February 1987): 483–501. http://dx.doi.org/10.1088/0305-4608/17/2/017.

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3

Adar, F., B. Lenain, D. C. Cook, and S. J. Oh. "Corrosion Product Identification by Micro-Raman and Mossbauer Spectroscopy." Microscopy and Microanalysis 4, S2 (July 1998): 506–7. http://dx.doi.org/10.1017/s1431927600022650.

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Micro-Raman spectrometry and Mossbauer spectroscopy have been used to identify the corrosion products on a steel coupon exposed in an industrial environment for 16 years. The Raman analysis was performed on a polished metallographic cross-section in order to map the oxides across the thickness of the coating. The spectra were recorded using a LabRam Micro-Raman spectrograph incorporating a 17 mW HeNe laser (attenuated to 1 mW to prevent oxide transformation), focused to 1 μm spot size, and 1800 g/mm grating. The confocal line-scan imaging enabled 100 spectra to be recorded in one scan at 0.5 um intervals across the thickness of the coating. The Mossbauer analysis was performed using in-situ scattering Mossbauer spectroscopy on the attached corrosion coating and transmission Mossbauer spectroscopy at 300K and 77K on the removed coating, to measure the fraction of each oxide present. Micro-Raman spectrometry showed that the corrosion products had formed in distinct layers as shown in Figure 1.

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4

Tulebayeva, Dinara, Assel Yermekova, Artem Kozlovskiy, and Maxim Zdorovets. "Investigation of phase transformations of iron nanoparticles during thermal annealing." EPJ Web of Conferences 201 (2019): 02003. http://dx.doi.org/10.1051/epjconf/201920102003.

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Structural properties and phase composition of nanoparticles based on iron oxide were studied. Mossbauer spectroscopy, X-ray diffraction, and scanning electron microscopy were used for the analysis of phase transformations. According to XRD and Mossbauer spectroscopy data, an increase in the annealing temperature, as well as the subsequent phase transformations of magnetite into maghemite and then to hematite, indicate an improvement in the structure and a decrease in microdistortions in the lattice as a result of annealing defects and vacancies. According to Mossbauer spectroscopy data at temperatures above 400°C, the lines of characteristic FeO, which are characteristic for disordered iron oxide, are observed, which also confirms the improvement of the crystal structure of nanoparticles.

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5

Pulido, E., I. Navarro, and A. Hernando. "Mossbauer spectroscopy in nanocrystalline materials." IEEE Transactions on Magnetics 28, no. 5 (September 1992): 2424–26. http://dx.doi.org/10.1109/20.179513.

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6

Fujita, F. E. "Recent developments in Mossbauer spectroscopy." Contemporary Physics 40, no. 5 (September 1999): 323–37. http://dx.doi.org/10.1080/001075199181396.

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7

Sheen, N. I., and V. H. McCann. "Mossbauer spectroscopy of NH4Co0.994Fe0.006Cl3and CsCo0.99Fe0.01Cl3." Journal of Physics: Condensed Matter 7, no. 9 (February 27, 1995): 1933–47. http://dx.doi.org/10.1088/0953-8984/7/9/017.

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8

Kimball, Clyde W. "Mossbauer spectroscopy and its applications." Journal of Nuclear Materials 144, no. 1-2 (January 1987): 207. http://dx.doi.org/10.1016/0022-3115(87)90299-6.

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9

Kamzin A.S., Caliskan G., Dogan N., ab1353@gmail.com, Semenov V. G, and Buryanenko I. V. "Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0 ≤ x≤ 1.0) magnetic nanoparticles functionalized with polyacrylic acid (PAA)." Technical Physics 67, no. 12 (2022): 1640. http://dx.doi.org/10.21883/tp.2022.12.55201.152-22.

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Studies of the properties of ZnxFe3-xO4 (x=0, 0.25, 0.5, 0.75, 1.0) magnetic nanoparticles synthesized by a modified hydrothermal method are presented in comparison with the properties of the same nanoparticles stabilized with polyacrylic acid ZnxFe3-xO4@PAA. The structure, size, morphology, and magnetic properties of the samples were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT IR), physical properties measurements (PPMS), and Mossbauer spectroscopy. The synthesized nanoparticles are single-phase, without additional impurities, have a narrow size distribution and are in the superparamagnetic phase. From the (XRD) measurements, it was found that with an increase in the Zn content from x=0 to x=1.0, the sizes of the nanoparticles were increasing from 17 to 33 nm. Analysis of the Mossbauer spectroscopy data showed that when doped with Zn ions from x=0 to x=1.0, the sizes of the nanoparticles were decreasing from 15 nm to 5 nm. The results of the Mossbauer studies showed that both ZnxFe3-xO4 and ZnxFe3-xO4@PAA has a core/shell type structure in which the core is magnetically ordered, whereas the shell does not have magnetic ordering. Mossbauer studies indicate that the coating of citric acid particles leads to their isolation from each other (i. e., a decrease in the thickness of the paramagnetic shell, and due to this to increasing in the diameter of the core). This (the last sentense) sentense is too long. It could be mode two or three sentences for better clarification. Keywords: ferrite-spinel nanoparticles, hydrothermal synthesis, polyacrylic acid functionalization, Mossbauer spectroscopy, properties, crystal and magnetic structure.

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10

Rodmacq, B., A. K. Bhatnagar, and A. Chamberod. "Mossbauer spectroscopy of hydrogenated Fe73Ti27amorphous alloys." Journal of Physics F: Metal Physics 16, no. 11 (November 1986): L259—L263. http://dx.doi.org/10.1088/0305-4608/16/11/001.

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11

Herber, Rolfe. "Mossbauer Spectroscopy Applied to Inorganic Chemistry." Organometallics 4, no. 6 (June 1985): 1148. http://dx.doi.org/10.1021/om00125a900.

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12

Alp, E. E., W. Sturhahn, and T. Toellner. "Synchrotron Mossbauer spectroscopy of powder samples." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 97, no. 1-4 (May 1995): 526–29. http://dx.doi.org/10.1016/0168-583x(94)00743-8.

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13

Govaert, A., C. Dauwe, P. Plinke, J. De Sitter, E. De Grave, and G. Robbrecht. "Analysing iron ores with Mossbauer spectroscopy." Bulletin des Sociétés Chimiques Belges 85, no. 5 (September 1, 2010): 251–59. http://dx.doi.org/10.1002/bscb.19760850501.

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14

Sedykh V. D., Rusakov V. S., and Gubaidulina T. V. "Low-temperature Mossbauer studies of substituted La-=SUB=-0.67-=/SUB=-Sr-=SUB=-0.33-=/SUB=-FeO-=SUB=-3-γ-=/SUB=- lanthanum ferrite." Physics of the Solid State 65, no. 4 (2023): 613. http://dx.doi.org/10.21883/pss.2023.04.56003.18.

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The valence states of Fe atoms and the formation of oxygen vacancies in substituted La0.67Sr0.33FeO3-γ orthoferrite have been studied in detail by low-temperature Mossbauer spectroscopy under oxygen removal. It has been shown that the averaged valence state of Fe atoms is not revealed with a decreasing measurement temperature. This makes it possible to reveal Fe4+ ions. The Analysis of the obtained data allows us to conclude that the presence of several Zeeman sextets associated with Fe3+ ions is related to the appearance of oxygen vacancies and Fe4+ ions in the nearest ionic surrounding of Fe ions. Using the Mossbauer data, the number of oxygen vacancies and oxygen ions has been determined for all the studied samples depending on the vacuum annealing temperature. Keywords: perovskites, substituted lanthanum ferrites, X-ray diffraction analysis, Mossbauer spectroscopy, Fe valence states, oxygen vacancies.

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15

Samide, Adriana, Ion Bibicu, Mircea Preda, Olimpia Rusu, and Paul Chirita. "INVESTIGATION OF CARBON STEEL CORROSION IN DILUTED AMMONIACAL MEDIA." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 15, no. 15 (December 20, 2007): 59–69. http://dx.doi.org/10.48141/sbjchem.v15.n15.2007.62_revistadec2007partial.pdf.

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Electrochemical measurements (steady-state current-voltage curves) were coupled with Mossbauer spectroscopy techniques to investigate the corrosion of carbon steel in diluted ammoniacal media. The corrosion current for carbon steel in diluted ammoniacal media was determined from galvanostatic measurements, through extrapolation of the Tafel segments at the corrosion potential. Mossbauer measurements were performed at room temperature in the transmission (TMS) and conversion electron spectroscopy (CEMS) using a conventional constant-accelerating spectrometer with a 57Co-Rh source. The result of the corrosion is the layer appearance (nonstoichiometric iron oxide) on the sample surface.

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16

Chakrabarti, Mahuya, S. Chattopadhyay, D. Sanyal, A. Sarkar, and D. Jana. "Probing Materials by Positron Annihilation Technique and Mossbauer Spectroscopy - Review." Materials Science Forum 699 (September 2011): 1–37. http://dx.doi.org/10.4028/www.scientific.net/msf.699.1.

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Positron annihilation technique is a well known technique to characterize the defects in a material. These defects can be identified by positron annihilation lifetime and coincidence Doppler broadening of positron annihilation radiation measurement. In this chapter we report the room temperature positron annihilation lifetime for single crystalline ZnO. From our study it is confirmed that the present crystal contains VZn–hydrogen complexes with low open volumes. Another important nuclear solid technique is the Mossbauer Spectroscopic technique which has been used to probe the local magnetic properties of a solid. Here we have summarized Mossbauer spectroscopic studies on ferrites.

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17

SHOKANOV, A. K., A. A. KYRYKBAYEVA, and B. T. SULEIMENOV. "MOSSBAUER AND X-RAY FLUORESCENCE STUDIES OF FLY ASH BASED PROPPANTS." Neft i Gaz 132, no. 6 (December 30, 2022): 74–83. http://dx.doi.org/10.37878/2708-0080/2022-6.06.

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This article discusses the results of the study of proppants obtained from domestic raw materials - bauxite, kaolin and white clay, sand, as well as fly ash by nuclear gamma resonance spectroscopy (the Mossbauer effect) and X-ray fluorescence analysis. The hyperfine structure, electronic states and elemental composition of proppants are given. The results of the study of volatile ash obtained during pulverized coal burning of Ekibastuz, Shubarkul, Karazhyralinsky deposits at thermal power plants are analyzed. According to the results of the studies, various combinations of complex phases and the elemental composition of proppants were determined using Mossbauer spectroscopy and X-ray fluorescence analysis. The Mossbauer measurements were carried out on the MS1104Em spectrometer in the constant acceleration mode with a 57Co source in a chromium matrix at room temperature. The elemental composition of samples of proppants based on fly ash was determined using an energy dispersive X-ray fluorescence spectrometer (RFS) at the EDX-7000 installation of SHIMADZU.

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18

McCammon, C. A. "Insights into Phase Transformations from Mossbauer Spectroscopy." Reviews in Mineralogy and Geochemistry 39, no. 1 (January 1, 2000): 241–64. http://dx.doi.org/10.2138/rmg.2000.39.09.

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19

Laban, J. A., and V. H. McCann. "Mossbauer spectroscopy of CsCoCl3doped with57Fe and Mg." Journal of Physics: Condensed Matter 7, no. 36 (September 4, 1995): 7283–92. http://dx.doi.org/10.1088/0953-8984/7/36/017.

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20

Barandiarán, J. M., M. L. Fdez-Gubieda, F. Plazaola, and O. V. Nielsen. "MOSSBAUER SPECTROSCOPY IN Fe RICH AMORPHOUS ALLOYS." Le Journal de Physique Colloques 49, no. C8 (December 1988): C8–1367—C8–1368. http://dx.doi.org/10.1051/jphyscol:19888626.

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21

Aksenova, N. P., and M. A. Chuev. "Mossbauer-Spectroscopy Characterization of Nanostructured Magnetic Materials." Russian Microelectronics 34, no. 5 (September 2005): 279–94. http://dx.doi.org/10.1007/s11180-005-0039-y.

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22

Kanzaki, Tadao, Kenzo Kitayama, and Kazuo Shimokoshi. "Mossbauer Spectroscopy Studies on Zn-Bearing Ferrite." Journal of the American Ceramic Society 76, no. 6 (June 1993): 1491–94. http://dx.doi.org/10.1111/j.1151-2916.1993.tb03930.x.

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23

Field, LD, TW Hambley, PA Humphrey, CM Lindall, GJ Gainsford, AF Masters, TG Stpierre, and J. Webb. "Decaphenylferrocene." Australian Journal of Chemistry 48, no. 4 (1995): 851. http://dx.doi.org/10.1071/ch9950851.

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Decaphenylferrocene was obtained as an extremely insoluble, maroon microcrystalline solid by heating [(η5-C5Ph5)((η6-C6H5)C5Ph4)Fe], and was characterized by 57Fe Mossbauer spectroscopy, X-ray photoelectron spectroscopy, mass, electronic and vibrational spectroscopy, solid-state 13C n.m.r. spectroscopy and high-resolution X-ray powder diffraction, which showed it to be isostructural with decaphenylnickelocene.

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24

Pietrusiewicz, Pawel, Marcin Nabialek, and Bartlomiej Jez. "Structural and Magnetic Relaxation of Fe61Co10Y8Mo1B20 Bulk Amorphous Alloy Obtained Using Two Methods." Revista de Chimie 69, no. 8 (September 15, 2018): 2097–101. http://dx.doi.org/10.37358/rc.18.8.6481.

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Bulk amorphous Fe61Co10Y8Mo1B20 alloys in the form of plates have been prepared using two methods: suction casting and injection casting. The structure of the as cast samples have been studied using Mossbauer spectroscopy. The obtained Mossbauer spectra are typical for materials of amorphous structure. In the hyperfine field distributions obtained from the Mossbauer spectra analysis, there are variations between the probability of occurrence of magnetic atoms around central atom. Then, magnetic susceptibility disaccommodation has been measured for the tested samples. These measurements indicate that the structural relaxation in the studied samples occur at the elementary level. Injection casting method for the tested alloy determines, in the material volume, the formation of more point relaxators in the form of free volume.

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25

Al-Alawi, Z., A. M. Gismelseed, A. A. Yousif, M. A. Worthing, H. H. Sutherland, A. M. Rais, M. E. El-Zain, and A. D. Al-Rawas. "Cation Distribution in Natural Chromites from Oman." Sultan Qaboos University Journal for Science [SQUJS] 1, no. 1 (January 1, 1996): 55. http://dx.doi.org/10.24200/squjs.vol1iss1pp55-61.

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Two specimens or natural chromite from the Oman ophiolite were studied using Mossbauer Spectroscopy (MS), X-ray Diffraction (XRD). and Scanning Electron Microscopy (SEM). The diffraction patterns obtained at room temperature showed that the two specimens have a face-centered cubic spinal structure. Their Mossbauer spectra at 295 K. 160 K and 78 K have been fitted to three doublets. assigned to two Fe 2+ at the tetrahedral (A1+,A2) sites and one Fe1+ at the octahedral (B) site. The ferrous-ferric ratio obtained from the Mossbauer analysis together with the atomic concentration derived from the microprobe data are used to derive the chemical formulae for the two specimens. The data also supports also supports a model of ordered caution distribution in the specimens examined.

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26

Shimokoshi, K., T. Kanzaki, and R. Norman Jones. "Deconvolution of Mossbauer Spectra by the Finite Impulse Response Operator (FIRO) Method." Applied Spectroscopy 39, no. 6 (November 1985): 1014–17. http://dx.doi.org/10.1366/0003702854249736.

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The finite impulse response operator (FIRO) method, developed recently by Jones and Shimokoshi [Applied Spectroscopy 37, 59 (1983)] has been applied to the deconvolution of Mossbauer spectra. The overlapped bands of the Mossbauer spectra of iron oxides, formed in the air oxidation of an aqueous suspension of Fe(OH)2, have been deconvolved by the FIRO method in order that the correct positions and intensities of the lines might be defined. The peak positions so determined can be used with good reliability as initial estimates for the customary method of profile determination by a least-squares fitting routine.

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27

Pavlenko A.V., Stryukov D. V., and Kubrin S.P. "The phase composition and structure of the BiFeO-=SUB=-3-=/SUB=- film grown on MgO(001) substrate by high frequency cathode deposition in oxygen atmosphere." Physics of the Solid State 64, no. 2 (2022): 206. http://dx.doi.org/10.21883/pss.2022.02.52969.215.

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The crystal structure and Mossbauer spectroscopy studies results for BiFeO3 film growth on the MgO(001) single crystal substrate are present in the paper. It been shown that film have high crystal perfection and low defectiveness which results in appearing of narrow lines during the theta-2theta and φ scanning and the small (lower than 0.7o) disorientation of film and substrate crystal axes. It is been revealed that unit cell of BiFeO3/MgO(001) heterostructure possess monoclinic symmetry and deformation of unit cell is negligible. The Mossbauer study shows that magnetic subsystem of film has spatial spin-modulated structure with zero value of anharmonicity parameter (m). This indicate that at room temperature the magnetic anisotropy changes from the "easy axis" type to "easy plane" type. Keywords: thin films, bismuth ferrite, Mossbauer effect.

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28

Zagorskiy D. L., Doludenko I. M., Frolov K. V., Perunov I. V., Chuev M. A., Chumakov N. K., Kalachikova I. V., Artemov V. V., Tziganova T. V., and Kruglikov S. S. "Features of obtaining by the method of matrix synthesis, structure and magnetic properties of iron nanowires." Physics of the Solid State 65, no. 6 (2023): 932. http://dx.doi.org/10.21883/pss.2023.06.56104.11h.

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Nanowires from iron were investigated. Samples in the form of arrays of parallel threads (wires) were obtained by matrix synthesis using track membranes. Matrices with parallel pores of 100 nm were used, and the growth voltage was varied --- 0.8 V, 1 V and 1.2 V. Electron microscopic studies of the growth matrix and samples were carried out. The obtained data of Mossbauer spectroscopy and magnetometry correlate well. Thus, a comparison of the results obtained by these methods showed that with an increase in the deposition potential during the synthesis of nanowires, the misorientation angle of the magnetic moments of domains increases. It is also shown that as the deposition potential increases, the coercive force decreases. Keywords: magnetic nanowires, matrix synthesis, structure, Mossbauer spectroscopy, magnetic properties.

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29

Dyar, M. D. "Optical and Mossbauer Spectroscopy of Iron in Micas." Reviews in Mineralogy and Geochemistry 46, no. 1 (January 1, 2002): 313–49. http://dx.doi.org/10.2138/rmg.2002.46.06.

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30

Nasu,, Saburo. "Mossbauer Spectroscopy and its Application to Materials Research." High Temperature Materials and Processes 17, no. 1-2 (January 1998): 45–56. http://dx.doi.org/10.1515/htmp.1998.17.1-2.45.

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31

Lataifeh, Mahdi S., and Abed-Fatah D. Lehlooh. "Mossbauer spectroscopy study of substituted yttrium iron garnets." Solid State Communications 97, no. 9 (March 1996): 805–7. http://dx.doi.org/10.1016/0038-1098(95)00645-1.

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32

Dewberry, R. A., T. B. Brown, and S. R. Salaymeh. "Holdup measurements on an SRNL Mossbauer spectroscopy instrument." Journal of Radioanalytical and Nuclear Chemistry 287, no. 1 (September 9, 2010): 299–309. http://dx.doi.org/10.1007/s10967-010-0743-x.

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33

Cardile, CM, and DG Lewis. "Mossbauer spectroscopic evidence of a IVFe3+ intermediate in the oxidation of Fe(Oh)2 to α-FeOOH." Soil Research 29, no. 3 (1991): 399. http://dx.doi.org/10.1071/sr9910399.

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Mossbauer spectroscopy was used to study the oxidation of Fe(OH)2 under high pH conditions with the aim of detecting the formation of Fe(OH)3. The Mossbauer spectral parameters indicated that a small IVFe3+ component was initially present in the Fe(OH)2. The Mossbauer spectra were recorded at 77 K, thus any Fe species in solution would also be observed in the frozen state. The small IVFe3+ component increased progressively with the oxidation of the Fe(OH)2, maximizing with the onset of �-FeOOH formation. As �-FeOOH formation increased, the IVFe3+ component decreased, with �-FeOOH being the final sole phase. It is suggested that the Mossbauer spectral parameters indicate that a component such as Fe(OH)2 may form at high pH values as used in this study. Furthermore, any Fe3+ produced by the initial oxidation of Fe(OH)2 is exsolved from the solid and at the high pH of the surrounding liquid produces Fe(OH)-4 until the formation of the more stable �-FeOOH begins. This suggests Fe(OH)2 could be the building blocks for �-FeOOH in alkaline solution. No apparent Fe(OH)3 phase was observed as anticipated.

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34

Камзин, А. С., G. Caliskan, N. Dogan, A. Bingolbali, В. Г. Семенов, and И. В. Бурьяненко. "Магнитные наночастицы Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0 ≤ x≤ 1.0), функционализированные полиакриловой кислотой (Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=-@ПАК)." Журнал технической физики 92, no. 12 (2022): 1884. http://dx.doi.org/10.21883/jtf.2022.12.53756.152-22.

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Studies of the properties of ZnxFe3-xO4 (x=0, 0,25, 0,5, 0,75, 1) magnetic nanoparticles synthesized by a modified hydrothermal method are presented in comparison with the properties of the same nanoparticles stabilized with polyacrylic acid ZnxFe3-xO4@PAA. The structure, size, morphology, and magnetic properties of the samples were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT IR), physical properties measurements (PPMS), and Mossbauer spectroscopy. The synthesized nanoparticles are single-phase, without additional impurities, have a narrow size distribution and are in the superparamagnetic phase. From the RD measurements, it was found that with an increase in the Zn content from x = 0 to x= 1.0, the sizes of nanoparticles increasing from 17 to 33 nm. Analysis of the Mössbauer spectroscopy data showed that when doped with Zn ions from x=0 to x=1.0, the sizes of nanoparticles decreasing from 15 nm to 5 nm. The results of the Mossbauer studies showed that both ZnxFe3-xO4 and ZnxFe3-xO4@PAC has a core/shell type structure in which the core is magnetically ordered, whereas the shell does not have magnetic ordering. Mossbauer studies indicate that the coating of citric acid particles leads to their isolation from each other, a decrease or elimination of interactions between particles, a decrease in the thickness of the paramagnetic shell, and, due to this, an increase in the diameter of the core.

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35

Седых, В. Д., О. Г. Рыбченко, А. Н. Некрасов, И. Е. Конева, and В. И. Кулаков. "Влияние содержания кислорода на локальное окружение атомов Fe в анион-дефицитном SrFeO-=SUB=-3-delta-=/SUB=-." Физика твердого тела 61, no. 6 (2019): 1162. http://dx.doi.org/10.21883/ftt.2019.06.47694.372.

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The structure features of polycrystalline anion-deficient ferrite strontium SrFeO3-δ have been investigated for different oxygen content by Mossbauer spectroscopy, X-ray diffraction analysis and scanning electron microscopy. Three structures with a different composition have been prepared depending on heat treatment conditions. Several non-equivalent Fe positions exist within each structure that correspond to different local oxygen environments the relation and distortion degree of which change depending on oxygen quantity. Based on the Mossbauer data obtained an oxygen content has been estimated for each structure. One more the model intermediate composition Sr16Fe16O45 of the SrFeO3-δ compound is proposed.

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36

Kamzin A. S., Obaidat I. M., Semenov V. G., Narayanaswamy V., Al-Omari I. A., Issa B., and Buryanenko I. V. "Development and characterization of magnetic nanoparticles Co-=SUB=-1-x-=/SUB=-Zn-=SUB=-x-=/SUB=-Fe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- (0≤ x≤0.6) for biomedical applications." Physics of the Solid State 65, no. 3 (2023): 470. http://dx.doi.org/10.21883/pss.2023.03.55591.544.

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The results of studies of the properties of co-deposition of magnetic nanoparticles (MNPs) of Co1-xZnxFe2O4 spinel ferrites synthesized (at x=0.0; 0.1; 0.2; 0.4; 0.6) in order to synthesize magnetic particles for biomedical applications. X-ray diffraction (XRD), raman spectra, magnetic measurements and Mossbauer spectroscopy (MS) were used to study the Co1-xZnxFe2O4 MNPs. It was found that the synthesized MNPs CoxZn1-xFe2O4 are single-phase. According to the results of XRD measurements, it was found that the average sizes of crystallites are 13 nm for CoFe2O4 (x=0) and, with an increase in the Zn concentration, they decrease to 7 nm for Co1-xZnxFe2O4 (x=0.6), which is consistent with the Mossbauer data, which showed that the sizes of crystallites vary from 14 to 8 nm. In the raman spectra of the Co1-xZnxFe2O4 MNPs in the region of ~620 cm-1, splitting of the A1g, line is observed, indicating that the studied particles have an inverse spinel structure. The change in the ratio between intensities of A1g (1) and A1g (2) peaks is indicative of a significant redistribution of Co2+ and Fe3+ cations between tetrahedral andoctahedral positions in Co1-xZnxFe2O4 MNPs as the quantity of Zn increases, which is confirmed by the Mossbauer data. It is found that small sizes of MNPs result in a strengthening of the effects of size and an effect of surface on the magnetic structure of the surface layer. The MS analysis has shown that there is a layer on the MNP surface, the magnetic structure of which is different from from the structure of the crystallite volume. With increase in the quantity of Zn ions thickness of this layer increases and at x=0.6 the particle becomes completely paramagnetic. Mossbauer studies have shown that Co0.8Zn0.2Fe2O4 (x=0.2) particles are inthe superparamagnetic state and theirmagnetic blocking temperature is ~315 K, which is the most acceptable for the treatment of cancer by the magnetic hyperthermia method. Keywords: CoxMn1-xFe2O4, spinel ferrites, magnetic structure, superparamagnetism, Mossbauer spectroscopy, materials for biomedicine.

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37

Guseynov, Magomed, Sergey Taskaev, and Ibragimkhan Kamilov. "Mossbauer Investigation of the Chelyabinsk Meteorite Fragment." Materials Science Forum 845 (March 2016): 269–72. http://dx.doi.org/10.4028/www.scientific.net/msf.845.269.

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The article devoted to study of the fragments of Chelyabinsk meteorite with the help of Mossbauer spectroscopy. It is shown that the iron in various fragments of the meteorite exist in different crystallographic, physical and chemical conditions. A new phenomenon of sharp increasing effective magnetic field in the region of the iron nuclei in the temperature range of 553-573 К and jumps of the main parameters of Mossbauer spectra at other temperatures are observed. According to the data of the isomer shifts and quadruple splitting of the individual spectra, iron ions have a valence of Fe2+ − 3d6, Fe3+ − 3d5, Fe4+ − 3d4, Fe6+ − 3d2 and also intermediate between them. A qualitative explanation of the experimental data is proposed.

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38

Korovushkin, V. V., A. V. Smagina, and G. S. Podgorodetskii. "Assessing the reduction of iron ore by Mossbauer spectroscopy." Steel in Translation 42, no. 1 (January 2012): 1–3. http://dx.doi.org/10.3103/s096709121201010x.

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39

Griffen, D. T., and W. R. Nelson. "Mossbauer spectroscopy of Zn-poor and Zn-rich rhodonite." American Mineralogist 92, no. 8-9 (August 1, 2007): 1486–91. http://dx.doi.org/10.2138/am.2007.2385.

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Tsankov, L. T. "A method for studying dynamical effects in Mossbauer spectroscopy." Journal of Physics D: Applied Physics 18, no. 8 (August 14, 1985): 1645–53. http://dx.doi.org/10.1088/0022-3727/18/8/027.

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41

Tomala, K., J. P. Sanchez, and R. Kmiec. "Magnetism and crystal-field properties of DyRu2Si2from161Dy Mossbauer spectroscopy." Journal of Physics: Condensed Matter 1, no. 27 (July 10, 1989): 4415–23. http://dx.doi.org/10.1088/0953-8984/1/27/014.

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42

Zhang, G. L., and L. Niesen. "Solid Kr bubbles in aluminium observed by83Kr Mossbauer spectroscopy." Journal of Physics: Condensed Matter 1, no. 6 (February 13, 1989): 1145–51. http://dx.doi.org/10.1088/0953-8984/1/6/013.

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43

Engelmann, H., N. Kramer, Hsia Yuanfu, Liu Rongchuan, and U. Gonser. "Investigation of anomalous transitions in LiNbO3 by Mossbauer spectroscopy." Ferroelectrics 69, no. 1 (July 1986): 217–22. http://dx.doi.org/10.1080/00150198608008194.

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44

Heng, Lai, and Huang Zhigao. "Spin-wave excitation and Mossbauer spectroscopy of amorphous alloys." Intermetallics 8, no. 5-6 (May 2000): 655–57. http://dx.doi.org/10.1016/s0966-9795(99)00136-3.

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45

Hendriksen, P. V., S. Morup, and S. Linderoth. "Brownian oscillations in colloidal systems studied by Mossbauer spectroscopy." Journal of Physics: Condensed Matter 4, no. 12 (March 23, 1992): 3109–24. http://dx.doi.org/10.1088/0953-8984/4/12/009.

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46

Yi-long, Chen, Lu Ning, Peng Li-li, and Zhao Lei. "An exact expression for fractional absorption in Mossbauer spectroscopy." Wuhan University Journal of Natural Sciences 6, no. 4 (December 2001): 784–86. http://dx.doi.org/10.1007/bf02850899.

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47

Charati, Faramarz Rostami, Gholamreza Rahmani, Roya Bahadori, and Farah Sadat Madani. "A Spectroscopic and Nondestructive Analysis Methods for Investigation of Inorganic Pigments in A Cultural Heritage in North of Iran." Wood Research Journal 12, no. 1 (2021): 1–9. http://dx.doi.org/10.51850/wrj.2021.12.1.1-9.

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Many of the historical objects that form our cultural heritage are made of wood. Wooden artefacts, wood painted panels and historic furniture represent a significant part of our cultural heritage. Their preservation over time is a challenging task, and insect infestation still represents a primary cause of loss of cultural heritage artifacts. For this reason in this research, wood pigments that are important in the conservation of historical wooden objects are described. The characterization of very stable pigments from a cultural heritage building named by SAGHATALAR which is located in Mazandaran province, a suburb around of Fridonkenar city in the north of Iran near Caspian Sea (Cochakbishehmahaleh village) was investigated. The result were showed no organic materials was find in the four colors (Blue, Red, Yellow and Green) as samples of this building were detected and taken samples from them for characterization and analysis. The spectroscopic techniques that have been used are Fourier transform infrared spectroscopy (FT-IR), X‐ray fluorescence spectroscopy (XRF), X‐ray emission spectroscopy (XRD), Uv-vis spectroscopy, fluorescence spectroscopy, Raman spectroscopy and Mossbauer spectroscopy.

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48

Rojas Ayala, Chachi, V. A. Peña Rodríguez, and M. Delgado A. "CARACTERIZACION DE OBSIDIANAS ARQUEOLÓGICAS PERUANAS: REDES DE INTERCAMBIO." Revista de Investigación de Física 7, no. 01-02 (December 31, 2004): 51–58. http://dx.doi.org/10.15381/rif.v7i01-02.8827.

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Este trabajo presenta los resultados de los análisis realizados en muestras de obsidíanas provenientes de tres colecciones arqueológicas proporcionadas por el Museo de Arqueología y Antropología de la Universidad Nacional Mayor de San Marcos (Colección MacNeish, fechados a una edad 8000 3500 a.C.), y por el Museo Regional I.N.C. - ICA (Colecciones Maymi y Casa Vieja, correspondientes al período Horizonte Medio 800 d.C.) Asimismo, con la idea de un trabajo futuro para establecer rutas de intercambio y estudio de procedencias en agrupamientos humanos sentados en la Cordillera de los Andes, se estudian algunas muestras de obsidianas de fuentes volc;ánicas próximas a los puntos de recolección. Para el análisis se usaron las técnicas de Espectroscopia Mossbauer (MS) del 57Fe principalmente, Fluorescencia de Rayos X, PIXE (Proton Induced X Ray Emission Spectroscopy), ICP-AES (lnductively Coupled Plasma-Atomic Emission Spectroscopy) e ICP MS (Inductively Coupled Plasma-Mass Spectroscopy). Los estudios Mossbaucr muestran una relación para la proporción Fe2+/Fe3 basados en la información proveniente del entorno local de átomos de Fe dentro de la estructura vidriosa de la obsidiana, así como los parámetros hiperfinos para cada una de las muestras analizadas para análisis en comparación. A partir de los análisis químico multielemental de las técnicas ICP, PIXE y fluorescencia de Rayos X, se propone diferencias composicionales entre las muestras estudiadas.

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Павленко, А. В., Д. В. Стрюков, and С. П. Кубрин. "Фазовый состав и структура пленки BiFeO-=SUB=-3-=/SUB=-, выращенной на подложке MgO(001) методом ВЧ-катодного распыления в атмосфере O-=SUB=-2-=/SUB=-." Физика твердого тела 64, no. 2 (2022): 218. http://dx.doi.org/10.21883/ftt.2022.02.51932.215.

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The crystal structure and Mossbauer spectroscopy studies results for BiFeO3 film growth on the MgO(001) single crystal substrate are present in the paper. It been shown that film have high crystal perfection and low defectiveness which results in appearing of narrow lines during the θ-2θ and φ scanning and the small (lower than 0.7°) disorientation of film and substrate crystal axes. It is been revealed that unit cell of BiFeO3/MgO(001) heterostructure possess monoclinic symmetry and deformation of unit cell is negligible. The Mossbauer study shows that magnetic subsystem of film has spatial spin-modulated structure with zero value of anharmonicity parameter (m). This indicate that at room temperature the magnetic anisotropy changes from the "easy axis" type to "easy plane" type.

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Shopska, Maya, Zara Cherkezova-Zheleva, Daniela Paneva, Mihail Iliev, Georgi Kadinov, Ivan Mitov, and Veneta Groudeva. "Biogenic iron compounds: XRD, Mossbauer and FTIR study." Open Chemistry 11, no. 2 (February 1, 2013): 215–27. http://dx.doi.org/10.2478/s11532-012-0148-5.

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AbstractMaterials based on biogenic iron oxides, which are a product of the metabolic activities of the neutrophilic iron-oxidizing bacteria (NIOB) from Sphaerotilus-Leptothrix group, were investigated. Natural microbial probes were collected from freshwater flow from Vitosha Mountain (Bulgaria) and cultivated under laboratory conditions in respect to select suitable cultures and conditions (nutrition media) for biomaterial accumulation of biogenic oxides. Samples were studied by physicochemical methods: X-ray diffraction, Mossbauer spectroscopy and IR spectroscopy. Their phase composition and physicochemical properties were obtained. Presence of both amorphous and crystal phase (ultra- and highly dispersed particles) was proved. Iron-containing compound in the natural biomass consists of α-FeOOH. The cultivated materials have more complex composition with iron-containing ingredients as α-FeOOH, Γ-FeOOH, Γ-Fe2O3 and Fe3O4. The sample of natural biomass was tested in reaction of CO oxidation and it showed potential to be used as catalyst support.

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