Nb<sub>0.8</sub>CoSb ordering transformation caused by <i>in situ</i> heating-induced Nb diffusion

姓名
邮箱
手机号码
标题
留言内容
验证码

Abstract

This study focuses on the investigation of Nb _0.8CoSb half-Heusler alloy covered with Nb films. By employing in-situheating transmission electron microscopy (TEM) technique, diffusion of Nb is observed at high temperature, showing the ordering transformation from Nb _0.8CoSb to Nb _0.8+δCoSb. Through observations of high-angle annular dark-field (HAADF) images and selected-area electron diffraction (SAED) patterns, it is found that under elevated temperatures, the diffuse streaks representing short-range disorder in Nb _0.8CoSb sample transform into superlattice diffraction spots representing long-range order. The modulation wave vector of this superstructure is determined to be $ q={1}/{3}({a}^{*}+{b}^{*}-{c}^{*}) $ . This structural evolution primarily arises from the diffusion of Nb atoms from the Nb film into the Nb _0.8CoSb sample at high temperature, leading to compositional changes in Sb and Nb. Further comparative analysis reveals significant differences between in-situsynthesized Nb _0.8+δCoSb samples and ex-situsynthesized Nb _0.84CoSb samples despite both exhibiting superstructures. In the ex-situsynthesized Nb _0.84CoSb, the modulation wave vector of the superstructure is $ q={1}/{3}({2a}^{*}-2{c}^{*}) $ , which is mainly attributed to Nb compositional variations. Moreover, the superstructure in Nb _0.84CoSb sample can remain stable from room temperature to high temperature, whereas in Nb _0.8+δCoSb samples, it only exists at elevated temperatures and gradually weakens as the temperature decreases, suggesting that it may be a metastable structure between Nb _0.8CoSb and Nb _0.84CoSb. 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:

Authors and contacts

Corresponding author:Ge Bing-Hui,bhge@ahu.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11874394, 92163203).

FullText HTML: translate this paragraph

References

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]
[29]

Cited By

DownLoad: Full-Size Img PowerPoint

DownLoad: Full-Size Img PowerPoint

DownLoad: Full-Size Img PowerPoint

DownLoad: Full-Size Img PowerPoint

DownLoad: Full-Size Img PowerPoint

DownLoad: Full-Size Img PowerPoint

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]
[28]
[29]

[1]	Ren Xian-Li, Zhang Wei-Wei, Wu Xiao-Yong, Wu Lu, Wang Yue-Xia.Prediction of short range order in high-entropy alloys and its effect on the electronic, magnetic and mechanical properties. Acta Physica Sinica, 2020, 69(4): 046102.doi:10.7498/aps.69.20191671
[2]	Hua Yun-Feng, Zhang Dong, Zhang Lin-Xi.Ordered structures of nanorods induced by the helixes of semiflexible polymer chains. Acta Physica Sinica, 2015, 64(8): 088201.doi:10.7498/aps.64.088201
[3]	Liu Hua-Song, Ji Yi-Qin, Jiang Yu-Gang, Wang Li-Shuan, Leng Jian, Sun Peng, Zhuang Ke-Wen.Study on internal short-range order microstructure characteristic of SiO2 thin film. Acta Physica Sinica, 2013, 62(18): 187801.doi:10.7498/aps.62.187801
[4]	Chen Yan, Li Ya-Li, Liu Jian-Hua, Zhang Rui-Jun.Effect of 4 GPa pressure treatment on the solid state transformation kinetics of T8 steel in heating process. Acta Physica Sinica, 2012, 61(19): 196203.doi:10.7498/aps.61.196203
[5]	Hou Yong, Yuan Jian-Min.First-principle calculations of phase transitions and equation of state at T=0K for gold. Acta Physica Sinica, 2007, 56(6): 3458-3463.doi:10.7498/aps.56.3458
[6]	Pan Jiang-Ling, Ni Jun.Order-disorder phase transitions in the surface layers of fcc (001) AB alloy thin films. Acta Physica Sinica, 2006, 55(1): 413-418.doi:10.7498/aps.55.413
[7]	Wang Jin, Zhao Zhi-Gang, Liu Mei, Xing Ding-Yu.Order-disorder transitions and inverse melting in vortex lattices. Acta Physica Sinica, 2003, 52(12): 3162-3167.doi:10.7498/aps.52.3162
[8]	Gao Yu-Lin, Lu Yi-Jun, Zheng Jian-Sheng, Chai Zhi-Gang, Sang Hai-Yu, Zeng Xue-Ran.. Acta Physica Sinica, 2002, 51(1): 174-177.doi:10.7498/aps.51.174
[9]	TAN DONG-HUAN, PENG YONG, WANG CHENG-WEI, LI HU-LIN.. Acta Physica Sinica, 2001, 50(1): 144-148.doi:10.7498/aps.50.144
[10]	SHI HONG-TING, NI JUN, GU BING-LIN.KINETICS OF ORDERING FOR AN ALLOY SYSTEM IN A TWO DIMENSIONAL LATTICE. Acta Physica Sinica, 2001, 50(10): 1970-1978.doi:10.7498/aps.50.1970
[11]	SONG QING-GONG, DAI ZHAN-HAI, CONG XUAN-ZHONG, WEI HUAN, ZHANG QING-JUN.ORDERED STRUCTURES OF BINARY ALLOY WITH HEXAGONAL CLOSE-PACKED LATTICE. Acta Physica Sinica, 2000, 49(11): 2201-2209.doi:10.7498/aps.49.2201
[12]	YAN MEI, MA SHI-HONG, LIU LI-YING, WANG WEN-CHENG, CHEN ZHANG-HAI, LIU PU-LIN.THE MECHANISM OF PYROELECTRIC EFFECT IN ULTRATHIN MOLECULAR ORGANIZED FILMS OF HEMICYANINE DYES. Acta Physica Sinica, 1998, 47(11): 1917-1922.doi:10.7498/aps.47.1917
[13]	LI GUO-HUA, LIU ZHEN-XIAN, HAN HE-XIANG, WANG ZHAO-PING, DONG JIAN-RONG, LU DA-CHENG, SUN DIAN-ZHAO, WANG ZHAN-GUO.PHOTOLUMINESCENCE OF SPONTANEOUSLY ORDERED Ga0.5In0.5P ALLOY UNDER HYDROSTATIC PRESSURE. Acta Physica Sinica, 1996, 45(9): 1592-1600.doi:10.7498/aps.45.1592
[14]	HUANG ZHI-FENG, NI JUN, GU BING-LIN.GROUND-STATE ORDERED STRUCTURES OF TERNARY III-V SEMICO-NDUCTOR ALLOYS. Acta Physica Sinica, 1994, 43(12): 2003-2008.doi:10.7498/aps.43.2003
[15]	Lü SI-HUA, LIU GUO-LIANG, YAO JUN LIU, FENG-QIN, WU SI-CHENG.ADSORPTION OF CO ON Cu{001}c(2×2)-Pd ORDERED SURFACE ALLOY. Acta Physica Sinica, 1992, 41(3): 459-464.doi:10.7498/aps.41.459
[16]	LI TING, QIN ZI-KAI.GREEN'S FUNCTION THEORY OF PHASE TRANSITION IN ORDER-DISORDER TYPE FERROELECTRICS AND ANTIFERROELECTRICS. Acta Physica Sinica, 1988, 37(9): 1406-1414.doi:10.7498/aps.37.1406
[17]	.. Acta Physica Sinica, 1965, 21(6): 1304-1307.doi:10.7498/aps.21.1304
[18]	YEE SUN-SHENG, LIU YI-HUAN.THE ORDERING OF THE ALLOY AgAuZn₂. Acta Physica Sinica, 1965, 21(4): 839-848.doi:10.7498/aps.21.839
[19]	SZE SHIH-YUAN.ORDERING AND VACANCY DIFFUSION IN AuCu₃. Acta Physica Sinica, 1957, 13(4): 245-251.doi:10.7498/aps.13.245
[20]	Cheng Kai-jia;Li Zhong-zheng.A GENERAL THERMODYNAMICAL THEORY OF INTERNAL FRICTION (II) INTERNAL FRICTION IN ORDERED ANO DISORDERED STATES. Acta Physica Sinica, 1956, 12(4): 281-297.doi:10.7498/aps.12.281

Catalog

Vol. 73, Issue 11 - 2024-06-05

Metrics

Abstract views:942
PDF Downloads:47
Cited By:0

Search

Article