高熵过渡金属二硼化物的高温高压合成

龙海东; 陈杰; 肖雄; 彭放

doi:10.11858/gywlxb.20240790

高熵过渡金属二硼化物的高温高压合成

doi: 10.11858/gywlxb.20240790

四川大学原子与分子物理研究所, 四川成都　610065

基金项目: 国家自然科学基金（12074273）

详细信息

作者简介:
龙海东（1998－），男，硕士研究生，主要从事高压科学与凝聚态物理研究. E-mail：shen5149p@163.com

通讯作者:
彭　放（1960－），男，博士，教授，主要从事高压科学与凝聚态物理研究. E-mail：pengfang@scu.edu.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2024-04-15
- 修回日期: 2024-05-10
- 网络出版日期: 2024-07-08

High-Temperature and High-Pressure Synthesis of High-Entropy Transition Metal Diborides

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, China

摘要

摘要: 高熵过渡金属二硼化物因其优异的力学性能及热物理性能受到了人们的广泛关注。然而，过去通过高温固相反应合成的效率较低。为此，通过高温高压固相反应，在5.5 GPa、2300 ℃的温压条件下合成了以VB₂、NbB₂、TaB₂为基底的6类高熵过渡金属二硼化物。高压提高了高温下的固相反应效率，促进了高熵过渡金属二硼化物的合成。通过X射线衍射和能量色散X射线光谱仪表征并确认了6类高熵过渡金属二硼化物均由纯相组成，不存在氧化物杂质或第二相，且元素分布均匀，不存在元素偏析，证明了高温高压合成高熵过渡金属二硼化物的有效性和普适性。
- 高熵过渡金属二硼化物 /
- 固相反应 /
- 高温高压 /
- 高压合成
Abstract: High-entropy transition metal diborides have been extensively studied due to their high mechanical and thermodynamic properties. However, the conventional synthesis methods of these materials are inefficient. In this paper, we synthesized six types of high-entropy transition metal diborides based on VB₂, NbB₂, and TaB₂ by high-temperature and high-pressure solid-state reactions at 5.5 GPa and 2300 °C. The high pressure promoted the efficiency of solid-state reaction and facilitated the synthesis of high-entropy transition metal diborides. The X-ray diffraction and energy dispersive X-ray spectroscopy results have been confirmed that the six types of high-entropy transition metal diborides possessed pure phase compositions without oxide impurities or second phases, and exhibited uniform elemental distribution without elemental segregation. These results demonstrate that the synthesis of high-entropy transition metal diborides by using high-temperature and high-pressure solid-state reaction method is effectiveness and practicality.
- high-entropy transition metal diborides /
- solid state reaction /
- high-temperature and high-pressure /
- high-pressure synthesis

HTML全文

图 1 标A和标Z组装示意图

Figure 1. Schematic diagram of standard A and standard Z assembles

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图 2 高温高压合成工艺曲线

Figure 2. High-temperature and high-pressure process curves

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图 3 (a) HEDB-1的前驱体及各单组元二硼化物样品的XRD谱，(b) 5.5 GPa、1600～2300 ℃条件下HEDB-1 的XRD谱

Figure 3. (a) XRD patterns of the mixing precursor powder of HEDB-1 and the single diborides powder contented in HEDB-1;(b) XRD patterns of HEDB-1 synthesized at 5.5 GPa, 1600−2300 ℃

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图 4 在5.5 GPa、1600～2300 ℃条件下采用高温高压法合成的HEDB-1 样品的EDS

Figure 4. EDS of HEDB-1 synthesized via high-temperature and high-pressure processing under conditions of 5.5 GPa and temperatures ranging from 1600 ℃ to 2300 °C

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图 5 在5.5 GPa、2300 ℃下由高温高压法合成的样品HEDB-1～HEDB-6的XRD谱

Figure 5. XRD patterns of sample HEDB-1−HEDB-6 synthesized via high-temperature and high-pressure processing under conditions of 5.5 GPa and 2300 °C

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图 6 在5.5 GPa、2300 ℃条件下采用高温高压法合成的样品HEDB-1～HEDB-6的EDS

Figure 6. EDS of sample HEDB-1−HEDB-6 synthesized via high-temperature and high-pressure processing under conditions of 5.5 GPa and 2300 °C

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表 1 高熵过渡金属二硼化物的主峰峰位

Table 1. Main peak position of high-entropy transition metal diborides

Sample	High-entropy transition metal diborides	Peak position/(°)
Sample	High-entropy transition metal diborides	(001)	(100)	(101)
HEDB-1	(V_0.2Ta_0.2Cr_0.2Nb_0.2Ti_0.2)B₂	27.7	34.1	44.4
HEDB-2	(V_0.2Ta_0.2Mo_0.2Nb_0.2Ti_0.2)B₂	27.5	33.7	44.1
HEDB-3	(V_0.2Ta_0.2W_0.2Nb_0.2Ti_0.2)B₂	27.6	33.8	44.2
HEDB-4	(V_0.2Nb_0.2Ta_0.2Cr_0.2Mo_0.2)B₂	27.6	34.0	44.3
HEDB-5	(V_0.2Nb_0.2Ta_0.2Cr_0.2W_0.2)B₂	27.7	34.0	44.4
HEDB-6	(V_0.2Nb_0.2Ta_0.2Mo_0.2W_0.2)B₂	27.9	33.8	44.4

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