美国西北大学Mercouri G. Kanatzidis团队开发出具有无限结构多样性的化学计量守恒同源序列。该研究于2025年12月4日发表于国际一流学术期刊《科学》杂志上。

研究组在化学计量保守的框架BaSbQ₃ (Q = Te_1-xS_x)，其中x的每个值产生一个不同的相位。基本构件A₁ （BaSbSTe₂）和B_n (Ba_nSb_nS_n-1Te_2n+1)，由模块化的双层岩盐板堆叠而成，上面堆叠着功能性多碲化物之字形链，每个阶段只在这些块的大小和组装上有所不同。研究团队合成了十种化合物，这些化合物保持了由Te和s的等价、等电子取代引起的一致的化学特性。研究团队设想分子水平上的相形成在延伸、终止和组装阶段展开，并提出了“阴离子差异”的设计概念，其中相同源性和多碲化物分层网络可以通过利用阴离子电子亲和力和大小的差异来控制。

附：英文原文

Title: A stoichiometrically conserved homologous series with infinite structural diversity

Author: Hengdi Zhao, Xiuquan Zhou, Ziliang Wang, Patricia E. Meza, Yihao Wang, Denis T. Keane, Steven J. Weigand, Saul H. Lapidus, Duck-Young Chung, Christopher Wolverton, Vinayak P. Dravid, Stephan Rosenkranz, Mercouri G. Kanatzidis

Issue&Volume: 2025-12-04

Abstract: We describe a compositionally guided structural evolution within a stoichiometrically conserved framework, BaSbQ3 (Q = Te1xSx), where each value of x gives rise to a distinct phase. The fundamental building blocks, A1 (BaSbSTe2) and Bn (BanSbnSn1Te2n+1), were composed of modular double rocksalt slabs stacked with functional polytelluride zigzag chains, with each phase differing only in the size and assembly of these blocks. Ten compounds were synthesized that maintained a coherent chemical identity that arose from this isovalent, isoelectronic substitution of Te and S. We envision that the phase formation at a molecular level unfolds in stages of extension, termination, and assembly and propose a design concept of “anionic disparity,” where phase homologies and polytelluride hierarchical networks can be controlled by leveraging differences in anion electron affinity and sizes.

DOI: aea8088

Source: https://www.science.org/doi/10.1126/science.aea8088