Effects of Sn vacancy and excess Sn doping on structural, magnetic and electrical properties of Ni 47 Mn 40 Sn 13 ferromagnetic shape memory alloy

Hedayati, H.; Kameli, P.; Varzaneh, A. Ghotbi; Jannati, S.; Salamati, H.

doi:10.1016/j.intermet.2016.11.008

Cited by 13 publications

(5 citation statements)

References 41 publications

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“…These results contrast with the ones obtained by Hedayati et al [32], in which they claim that they were able to tune the T MT as a function of V Sn concentration. It is noteworthy to mention that they do not report any experimental evidence of Sn vacancies.…”

Section: B C V and Vacancy-type Determinationcontrasting

confidence: 99%

“…Moreover, Zhenni et al [27] and Kustov et al [28,29] point out the potential role that vacancy defects could have on the pinning of the MT, whereas Sánchez-Alarcos et al [30] and Santamarta et al [31] suggest different vacancy dynamics as responsible for the observed changes on the Curie temperature T c and T MT in Ni-Mn-Ga and Ni-Fe-Ga alloys, respectively. In a recent work Hedayati et al [32] claim that Sn vacancies in Ni-Mn-Sn systems can be used to obtain shifts on T MT up to 80 K. However, none of the previous works contribute any experimental evidence on vacancies.…”

Section: Introductionmentioning

confidence: 99%

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Identification of a Ni-vacancy defect in Ni-Mn- Z ( Z=Ga , Sn, In): An experimental and DFT positron-annihilation study

et al. 2019

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By means of experimental positron-annihilation-lifetime measurements and theoretical density functional theory (DFT) positron-lifetime calculations, vacancy-type defects in Ni 50 Mn 50−x Sn x (x = 25, 20, 15, 13, 10) and Ni 50 Mn 50−x In x (x = 25, 20, 16, 13) systems are systematically studied. The study is extended to Ni-Mn-Ga systems as well. Experimental results are complemented with electron-positron DFT calculations carried out within the local density approximation and generalized gradient approximation, where five different parametrizations accounting for the γ (r) enhancement factor are analyzed. Theoretical results indicate that the Boronski-Nieminen parametrization of γ (r) is the one that best predicts the experimental results, which ultimately enables us to identify V Ni as the vacancy present in the studied samples. The characteristic positron lifetime related to V Ni ranges between 181 and 191 ps in Ni-Mn-Sn/In systems. Positron-annihilation-lifetime spectroscopy results in these two systems delimit the lower bound of the achievable vacancy concentration, which is much larger compared with the reported values in Ni-Mn-Ga systems. The present work, along with setting the basis for positron simulations in Ni-Mn based Heusler alloys, delimits the effect that the variation of vacancies has in the martensitic transformation in Ni-Mn-Sn systems.

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Section: B C V and Vacancy-type Determinationcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of a Ni-vacancy defect in Ni-Mn- Z ( Z=Ga , Sn, In): An experimental and DFT positron-annihilation study

et al. 2019

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“…В исследуемой нами системе Ni-Mn-Sn достаточно подробно теоретически и экспериментально изучены фазовые переходы, магнитные и структурные свойства [1-10]. Детальному изучению структуры, магнитных и магнитокалорических свойств исследуемой нами композиции Ni 47 Mn 40 Sn 13 посвящены работы [11][12][13][14][15]. В данном составе при понижении температуры сначала наблюдается магнитный переход парамагнетик-ферромагнетик при T C ≈ 313 K, который проходит в аустенитной фазе.…”

Section: Introductionunclassified

Теплоемкость, теплопроводность и магнитокалорический эффект в сплаве Гейслера Ni-=SUB=-47-=/SUB=-Mn-=SUB=-40-=/SUB=-Sn-=SUB=-13-=/SUB=-

Гамзатов¹,

Батдалов²,

Хизриев³

et al. 2022

Физика Твердого Тела

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Приведены результаты исследования теплоёмкости, теплопроводности, и магнитокалорического эффекта поликристаллического сплава Ni47Mn40Sn13 в зависимости от температуры (T=80-350 К) и магнитного поля (0-8 T). Вблизи магнитоструктурного фазового перехода (МСФП) мартенсит--аустенит обнаружена значительная разница между величинами скачка теплоемкости Delta CP в режиме нагрева и охлаждения, что связывается с влиянием скрытой теплоты фазового перехода. В диапазоне T=80-300 K теплопроводность растет с температурой (dkappa/dT>0) и увеличивается более чем в три раза. Электронная теплопроводность в мартенситной фазе (T=150 K) составляет 37% от общей. В области МСФП обнаружен аномальный рост теплопроводности Deltakappa=kappa(аust)-kappa(mart)=4.2 Wm K. Вклады электронов и фононов в наблюдаемый скачок составляют 63 и 37% соответственно и обусловлены как ростом подвижности электронов проводимости при переходе мартенсит--аустенит, так и увеличением длины свободного пробега фононов. Исследован магнитокалорический эффект в циклических магнитных полях амплитудой 1.8 T. Установлена зависимость величины обратного эффекта от скорости сканирования температуры. Прямые измерения Delta T в циклическом магнитном поле 1.2 T показывает уменьшение амплитуды эффекта вблизи TC в два раза при увеличении частоты циклического магнитного поля от 1 до 30 Hz. Скорее всего это связано с магнитными и микроструктурными неоднородностями, которые выступают в качестве дополнительного канала тепловой диссипации. Ключевые слова: сплавы Гейслера, теплоёмкость, теплопроводность, магнитокалорический эффект, циклические магнитные поля.

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“…Phase transitions, magnetic and structural properties in the studied Ni-Mn-Sn system have been studied theoretically and experimentally in sufficient detail [1][2][3][4][5][6][7][8][9][10]. Papers [11][12][13][14][15] are dedicated to a detailed study of the structure, magnetic and magnetocaloric properties of the studied compound Ni 47 Mn 40 Sn 13 . A magnetic paramagneticferromagnetic transition is first observed (at a temperature decrease) in the given composition at T C ≈ 313 K, which takes place in the austenitic phase.…”

Section: Introductionmentioning

confidence: 99%

Heat capacity, thermal conductivity and magnetocaloric effect in Heusler alloy Ni-=SUB=-47-=/SUB=-Mn-=SUB=-40-=/SUB=-Sn-=SUB=-13-=/SUB=-

Gamzatov

Batdalov

et al. 2022

Physics of the Solid State

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The results of a study of heat capacity, thermal conductivity and magnetocaloric effect of the polycrystalline Ni47Mn40Sn13 alloy depending on temperature (T=80-350 K) and magnetic field (0-8 T) are given. A considerable difference between the values of a sudden change in heat capacity Delta CP in the heating and cooling mode was found near the magnetostructural martensite--austenite phase transition (MSPT), which is related to influence of latent heat of phase transition. Thermal conductivity in the range of T=80-300 K rises with temperature (dkappa/dT>0) and increases in more than three times. Electronic thermal conductivity in the martensitic phase (T=150 K) is 37% of the total value. An anomalous rise of thermal conductivity Deltakappa=kappa(aust)-kappa(mart)=4.2 Wm K was found in the region of MSPT. The contributions of electrons and phonons to the observed sudden change are 63 and 37% respectively and are conditioned both by a rise of mobility of conduction electrons under a martensite--austenite transition and by an increase of phonons' free path length. The magnetocaloric effect in cyclic magnetic fields with the amplitude of 1.8 T was studied. A dependence of reverse effect value on temperature scanning rate was established. The direct measurements of Delta T in the cyclic magnetic field of 1.2 T show a twofold decrease of the effect amplitude near TC at an increase of cyclic magnetic field frequency from 1 to 30 Hz. Most likely, this is related to magnetic and microstructural heterogeneities which act as an additional thermal dissipation channel. Keywords: Heusler alloys, heat capacity, thermal conductivity, magnetocaloric effect, cyclic magnetic fields.

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Effects of Sn vacancy and excess Sn doping on structural, magnetic and electrical properties of Ni 47 Mn 40 Sn 13 ferromagnetic shape memory alloy

Cited by 13 publications

References 41 publications

Identification of a Ni-vacancy defect in Ni-Mn- Z ( Z=Ga , Sn, In): An experimental and DFT positron-annihilation study

Identification of a Ni-vacancy defect in Ni-Mn- Z ( Z=Ga , Sn, In): An experimental and DFT positron-annihilation study

Теплоемкость, теплопроводность и магнитокалорический эффект в сплаве Гейслера Ni-=SUB=-47-=/SUB=-Mn-=SUB=-40-=/SUB=-Sn-=SUB=-13-=/SUB=-

Heat capacity, thermal conductivity and magnetocaloric effect in Heusler alloy Ni-=SUB=-47-=/SUB=-Mn-=SUB=-40-=/SUB=-Sn-=SUB=-13-=/SUB=-

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