Samarkand International Symposium on Magnetism
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SISM-2023 - Book of Abstracts 1
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Samarkand State University named after Sharof Rashidov Samarkand International Symposium on Magnetism 2 – 6 July, 2023 BOOK OF ABSTRACTS of Samarkand International Symposium on Magnetism SISM-2023 Samarkand, Uzbekistan 2023 2 Samarkand State University named after Sharof Rashidov Samarkand International Symposium on Magnetism 2 – 6 July, 2023 Book of Abstracts Main Topics Spintronics, Magnonics, Magnetotransport Magnetophotonics (linear and nonlinear magnetooptics, magnetophotonic crystals) High Frequency Properties and Metamaterials Diluted Magnetic Semiconductors and Oxides Magnetic Nanostructures and Low Dimensional Magnetism Magnetic Soft Matter (magnetic polymers, complex magnetic fluids and suspensions) Soft and Hard Magnetic Materials Magnetic Shape-Memory Alloys and Magnetocaloric Effect Multiferroics Topological Insulators Magnetism and Superconductivity Theory Magnetism in Biology and Medicine Miscellaneous Samarkand 2023 SISM - 2023 178 3PO-L6-4 THERMAL PROPERTIES OF AMORPHOUS FeNiSiC ALLOYS Kuvandikov O.K., Subkhankulov I., Khamraev N.S., Razhabov R.M., Imamnazarov D.Kh., Khomitov Sh.A. Samarkand State University named after Sharof Rashidov, Samarkand, Uzbekistan sherxomitov@gmail.com Amorphous alloys based on transition metals with additions of metalloids belong to the class of promising objects of modern materials science. This is due to the presence of unique properties in these alloys. In this regard, the study of the thermophysical properties of FeNiSiC amorphous alloys at high temperatures makes it possible to build a complete picture of the formation of a nanocrystalline state and reveal the features of the relationship between the crystalline and amorphous states. To interpret the experimental results, the free volume model [1] was used, within which the concentration dependence of the specific heat capacity would be numerically calculated for these samples, for which the measured specific heat capacity does not change significantly in the temperature range from room temperature to 500°C. At temperatures above 500°C, the specific heat capacity decreases, and its lower value reaches its minimum value at a temperature of 520°C, i.e. the specific heat capacity decreases to a value of the order of 18÷20 J/g•K. Then the curve returns to the original value of the specific heat. After that, starting from a temperature of 655°C, a second decrease in the curve is observed and a decrease in the heat capacity to a temperature of 835°C, and starting from this temperature, it sharply decreases and Cp increases with increasing temperature. According to the results of calorimetry, the thermal effects occurring in the sample during heating are considered, the desired value is the area under the curve on the graph. It is known that the area under the curve is its antiderivative function, the value of which is found by calculating a definite integral. Having only the results of the experiment on hand, the area on the graph was calculated by numerical integration using the trapezoidal method. The integration segment is divided into several intermediate segments, and the graph of the integrand is approximated by a broken line. The area of the integrand is approximately calculated by the sum of trapezoids. To eliminate the imperfection of the curve, the least squares method is used, which in this case made it possible to accurately calculate the area and, accordingly, the thermal effects occurring in the sample during heating. In this case, the magnitude of the thermal effect (enthalpy change) along the depth is ∆H=-72834 J/kg. It can be seen that this heat creates crystallization centers in amorphous alloys; one can observe that a first-order phase transition occurs. Thus, the results of the calorimetric analysis show that no phase changes occur in the sample starting from room temperature to 500 °C, after which an increase in the temperature of the sample causes a significant thermal effect, the first thermal effect being observed at a temperature of 500°C and it continues up to the temperature 525°C. This thermal effect corresponds to the first type of phase transition according to the type of crystallization. [1] K. Russew, L. Stojanova, Glassy Metals (Berlin: Springer, 2016). Figure 1. Graph of the dependence of the specific heat capacity of the samples on temperature SISM - 2023 330 Kataev V. ................................................... 157 Kats V.N..................................................... 153 Kaul A.R. ................................................... 284 Kazak N.V. ................................................. 207 Kazenwadel D.L. ........................................ 145 Khaidarov X.S. ........................................... 230 Khairullaev B.A. ........................................ 211 Khamraev N.S. ........................................... 178 Kharlamova A.M. ........................................ 77 Khasanov Kh.B. ................................. 201, 211 Khasanov M.A. .......................................... 230 Khashirova S. ............................................... 74 Khaydarov A.A. ......................................... 227 Khokhlov N.E. ........................................... 243 Khomitov Sh.A. ................................. 178, 313 Khomskii D.I. ............................................... 38 Khovaylo V.V. ....................................... 35, 82 Khudaigulova E.F. ..................................... 164 Khudayberdiev Z.S. ................................... 160 Kichin G.A. .......................................... 55, 146 Kiiamov A.G. ..................................... 171, 283 Kilmetova I.V............................................... 70 Kim G.W. ................................................... 113 Kim Y.K. ............................................ 111, 113 Kimura A.................................................... 309 Kirgizov S.E. .............................................. 314 Kirilenko D.A............................................. 145 Kiselev D.A. ................................................. 34 Kizirgulov I.R. ........................................... 299 Klimov A...................................................... 51 Knyazev G.A. ............................................. 130 Knyazev Yu.V. ........................................... 207 Ko M.J. ....................................................... 113 Kokurin I.A. ................................................. 43 Koledov V.V. ......................... 31, 36, 159, 179 Kolesnikov E.A. ........................................... 82 Kolesnikova V.G. ... 25, 74, 103, 259, 304, 306 Kolesov K.A................................. 36, 179, 180 Kolosvetov A. ............................................ 170 Kolyushenkov M.A. ................................... 325 Komanicky V. ............................................ 151 Komarov I.V. ............................................... 69 Komarova V.A. ............................................ 84 Komlev A.S. ......................................... 34, 272 Komleva E.................................................. 266 Komogortsev S.V. ...................................... 121 Korableva S.L. ........................... 280, 282, 283 Koshkid’ko Yu.S. ................................. 36, 184 Koskov M.A. ................................................ 24 Kostishin V.G....................................... 15, 274 Kostyuchenko N.V..................................... 302 Kotov L.N. ................................................. 223 Kozhevnikova P.Y. ...................................... 77 Kozlov A.G. ........................... 52, 56, 113, 115 Kozlov G.G. ............................................... 165 Kozlov V.O. ............................................... 165 Kramarenko E.Yu. ..................................... 257 Kravtsov E.A. ............................................ 107 Krichevsky D.M................................. 169, 170 Krinitsina T.P. ............................................ 104 Kudasov Yu.B. ........................................... 302 Kudyukov E.V. .......................................... 107 Kugel K.I. .............................................. 38, 63 Kuklin A. ................................................... 253 Kulesh N.A. ................................................. 34 Kulevoy T.V. ............................................... 70 Kulikova D.P. ............................................ 149 Kulmatova G. ............................................. 206 Kumar A. ................................................... 294 Kurbaniyazov A.S. ..................................... 228 Kurbaniyazov S.Kh. ................................... 228 Kurbanov B.I. ............................................ 227 Kurbanov J.O. ............................................ 216 Kurbanov U.T. ................................... 160, 292 Kurlyandskaya G.V. ...................... 77, 78, 106 Kushchev S.B............................................. 285 Kushiev G.A. ..................................... 208, 311 Kuvandikov O.K. .. 58, 81, 178, 201, 211, 225, 286, 313, 314 Kuzikova A.V. ........................................... 166 Kuzmichev A.N. ........................................ 130 Kuzmin D.A. ........................ 36, 101, 135, 167 Kuznetsov A.A..................................... 88, 258 Kuznetsov A.S. ............................ 36, 179, 180 Kuznetsova M.A. ......................................... 52 Kvashnin D.G. ........................................... 268 Lagarkov A.N. ....................................... 69, 71 Laliena V.............................................. 11, 131 Larrañaga A. ................................................ 77 Lebedeva E.D............................... 49, 219, 220 Leiko G.A. ................................................. 118 Lepalovskij V.N. ................................ 106, 107 Letushev M.E. .............................................. 45 Levada K.V. ................................... 25, 95, 251 Levchenko S.V........................................... 105 Lifshits M.B. ................................................ 39 Likerov R.F. ............................................... 110 Lim S.......................................................... 268 Litvinova L.S. ............................................ 251 Lobanov D.A. ............................................ 260 Download 374.06 Kb. 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