-
This study focused on the investigation of Nb0.8CoSb half-Heusler alloy covered with Nb films. By employing in-situ heating transmission electron microscopy (TEM) technique, diffusion of Nb was observed at high temperature, resulting in the ordering transformation from Nb0.8CoSb to Nb0.8+δCoSb. Through observations of high-angle annular dark-field (HAADF) images and selected-area electron diffraction (SAED) patterns, it was found that under elevated temperatures, the diffuse streaks representing short-range disorder in Nb0.8CoSb samples transitioned into superlattice diffraction spots representing long-range order. The modulation wave vector of this superstructure was determined to be q=1/3(a* + b*-c*). This structural evolution primarily arised from the diffusion of Nb atoms from the Nb film into the Nb0.8CoSb sample at high temperature, leading to compositional changes in Sb and Nb. Further comparative analysis revealed significant differences between in-situ synthesized Nb0.8+δCoSb samples and ex-situ synthesized Nb0.84CoSb samples despite both exhibiting superstructures. In the ex-situ synthesized Nb0.84CoSb, the modulation wave vector of the superstructure was <q=1/3(2a*-2c*), mainly attributed to Nb compositional variations. Moreover, the superstructure in Nb0.84CoSb samples could remain stable from room temperature tor high temperature, whereas in Nb0.8+δCoSb samples, it only existed at elevated temperatures and gradually weakened as the temperature decreased, suggesting it might be a metastable structure between Nb0.8CoSb and Nb0.84CoSb. In summary, this study reveals the diversity of superstructures induced by compositional variations and the complexity of structural phase transitions in half-Heusler alloys, enriching the understanding of these materials and providing important guidance for the design and functional control of phase-change materials
-
Keywords:
- solid-state phase transition /
- in-situ heating /
- short-range ordering /
- half-Heusler alloy
-
[1] Lu N, Zhang P, Zhang Q, Qiao R, He Q, Li H-B, Wang Y, Guo J, Zhang D, Duan Z, Li Z, Wang M, Yang S, Yan M, Arenholz E, Zhou S, Yang W, Gu L, Nan C-W, Wu J, Tokura Y, Yu P 2017 Nature 546 124
[2] Yun H, Zhang D, Birol T, Wang J-P, Mkhoyan K A 2023 Nano Lett. 23 7576
[3] Tracy C L, Park S, Rittman D R, Zinkle S J, Bei H, Lang M, Ewing R C, Mao W L 2017 Nat. Commun. 8 15634
[4] Liu T, Dou X, Xu Y, Chen Y, Han Y 2020 Research 2020 4370817
[5] Sato T, Yoshikawa K, Zhao W, Kobayashi T, Rajendra H B, Yonemura M, Yabuuchi N 2021 Energy Mater. Adv. 20219857563
[6] He R, Lei S, Liu M, Qin M, Zhong W, Cheng S, Xie J 2022 Energy Mater. Adv. 2022 0003
[7] Zhu W, Ren L, Li Y, Lu C, Lin X, Zhang Q, Yang X, Hu Z, Cheng T, Zhao Y, Zou J 2023 Energy Mater. Adv. 4 0069
[8] Kozlovskiy A L, Kenzhina I E, Zdorovets M V 2020 Ceram. Int. 46 10262
[9] Yu C L, Li G, Kumar S, Yang K, Jin R C 2014 Adv. Mater. 26 892
[10] Wu L, Hu H, Xu Y, Jiang S, Chen M, Zhong Q, Yang D, Liu Q, Zhao Y, Sun B, Zhang Q, Yin Y 2017 Nano Lett. 17 5799
[11] Ito H, Muromoto M, Kurenuma S, Ishizaka S, Kitamura N, Sato H, Seki T 2013 Nat. Commun. 4 2009
[12] Tezuka N, Ikeda N, Miyazaki A, Sugimoto S, Kikuchi M, Inomata K 2006 Appl. Phys. Lett. 89 112514
[13] Goll G, Marz M, Hamann A, Tomanic T, Grube K, Yoshino T, Takabatake T 2008 PHYSICA B 403 1065
[14] Opeil C P, Mihaila B, Schulze R K, Mañosa L, Planes A, Hults W L, Fisher R A, Riseborough P S, Littlewood P B, Smith J L, Lashley J C 2008 Phys. Rev. Lett. 100 165703
[15] Liu Z H, Zhang M, Cui Y T, Zhou Y Q, Wang W H, Wu G H, Zhang X X, Xiao G 2003 Appl. Phys. Lett. 82 424
[16] Sutou Y, Imano Y, Koeda N, Omori T, Kainuma R, Ishida K, Oikawa K 2004 Appl. Phys. Lett. 85 4358
[17] Hu F-x, Shen B-g, Sun J-r, Wu G-h 2001 Phys. Rev. B 64 132412
[18] Hu F-x, Shen B-g, Sun J-r 2000 Appl. Phys. Lett. 76 3460
[19] Li Z, Jing C, Chen J, Yuan S, Cao S, Zhang J 2007 Appl. Phys. Lett. 91 112505
[20] Khan M, Dubenko I, Stadler S, Ali N 2007 Appl. Phys. Lett. 91 072510
[21] Xia K, Nan P, Tan S, Wang Y, Ge B, Zhang W, Anand S, Zhao X, Snyder G J, Zhu T 2019 Energy Environ. Sci. 12 1568
[22] Nan P, Wu K, Liu Y, Xia K, Zhu T, Lin F, He J, Ge B 2020 Nanoscale 12 21624
[23] Liu Y, Fu C, Xia K, Yu J, Zhao X, Pan H, Felser C, Zhu T 2018 Adv. Mater. 30 1800881
[24] Xia K, Liu Y, Anand S, Snyder G J, Xin J, Yu J, Zhao X, Zhu T 2018 Adv. Funct. Mater. 28 1705845
[25] Pu Y, He B, Niu Y, Liu X, Zhang B 2023 Research 6 0043
[26] Zhang H, Wang W, Sun J, Zhong L, He L, Sun L 2022 Research 20229834636
[27] Nan P F, Yang L X, Wang Y M, Xia K Y, Zhu T J, Ge B H 2019 J. Chin. Electron Microsc. Soc. 38 477(in Chinese)[南鹏飞,杨丽霞,王玉梅,夏凯阳,朱铁军,葛炳辉2019电子显微学报 38 477]
[28] Pennycook S J, Boatner L A 1988 Nature 336 565
[29] Pennycook S J 1989 Ultramicroscopy 30 58
Metrics
- Abstract views: 139
- PDF Downloads: 0
- Cited By: 0
下载:
