文章信息/Info

Title:

Research Progress on Rare Earth Hexaboride

文章編號(hào):

1674-3962(2020)02-0124-09

作者:

許少文1; 2; 賈帆豪1; 2; 喬磊1; 2; 任偉1; 2

(1. 上海大學(xué) 量子與分子結(jié)構(gòu)國(guó)際研究中心，上海 200444) (2. 上海大學(xué)物理系，上海 200444)

Author(s):

XU Shaowen1; 2;  JIA Fanhao1; 2;  QIAO Lei1; 2;  REN Wei1; 2

(1. International Centre for Quantum and Molecular Structures, Shanghai University, Shanghai 200444, China) (2. Physics Department, Shanghai University, Shanghai 200444, China)

關(guān)鍵詞:

陰極材料; 稀土六硼化物; 實(shí)驗(yàn)制備; 密度泛函理論

Keywords:

cathode material;  rare earth hexaboride;  experimental preparation;  density functional theory

分類號(hào):

O469

DOI:

10.7502/j.issn.1674-3962.201906011

文獻(xiàn)標(biāo)志碼:

A

摘要:

作為著名的陰極材料，稀土六硼化物（RB6）在實(shí)驗(yàn)和理論上已經(jīng)被研究了幾十年。在RB6中，金屬原子被嵌入通過B—B共價(jià)鍵相互連接的硼籠網(wǎng)絡(luò)。這種獨(dú)特的籠狀結(jié)構(gòu)、稀土元素特殊的4f軌道和硼元素的缺電子特性，使該材料表現(xiàn)出很多優(yōu)異的性質(zhì)：功函數(shù)低、電導(dǎo)率高、發(fā)射電流密度大、硬度大、楊氏模量高、熔點(diǎn)高、化學(xué)穩(wěn)定性高、抗熱輻射性強(qiáng)等。RB6材料用途廣泛，已成功應(yīng)用于雷達(dá)、航空航天、消費(fèi)電子、儀表器械、核電等多個(gè)領(lǐng)域。從若干RB6的結(jié)構(gòu)和性質(zhì)出發(fā)，綜述了其實(shí)驗(yàn)制備方法和密度泛函理論（DFT）研究的進(jìn)展，總結(jié)了其在多個(gè)領(lǐng)域的應(yīng)用進(jìn)展，最后給出研究展望。

Abstract:

As a well-known cathode material, rare earth hexaboride (RB6) has been studied experimentally and theoretically for decades. In RB6， metal atoms are embedded in a network of boron cages connected by B—B covalent bonds. This unique boron cage, the special 4f orbital and boron-deficient properties of rare earth elements make RB6 exhibit many excellent properties, such as low work function, high electrical conductivity, high emission current density, high hardness, high Young‘s modulus, high melting point, high chemical stability and strong resistance to heat radiation. RB6 materials are widely used in radar, aerospace, consumer electronics, instrumentation, nuclear power and other fields. Based on the structure and properties of RB6, this review describes the progress of its experimental preparation methods and theoretical density functional (DFT) research, summarizes its application in various fields, and finally gives our prospects.