Size as a Parameter to Stabilize New Phases: Rock Salt Phases of PbmSb2nSem+3n

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• 作者：Ronald B. Soriano ; Jinsong Wu ; Mercouri G. Kanatzidis
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：137
• 期：31
• 页码：9937-9942
• 全文大小：460K
• ISSN：1520-5126

文摘

A series of Pb_mSb_2nSe_m+3n nanocrystals (m = 2, 4, 6 and 8; n = 1) are demonstrated that exist only as a distinct phase on the nanoscale. The nanocrystals aggregates are new compounds adopting the cubic NaCl-type structure. These materials form aggregates comprised of nanocrystallites that are attached at a preferred orientation. Elemental compositions were studied using the complementary techniques of scanning transmission electron microscopy/energy dispersive X-ray spectroscopy and inductively coupled plasma-atomic emission spectroscopy. The new ternary nanocrystal aggregates are moderately monodisperse and exhibit well-defined band gap energies in the mid-IR region. The Pb_mSb_2nSe_m+3n nanomaterials behave as homogeneous solid solutions with lattice parameter trending as a function of Sb incorporation at room temperature and tend to phase separate into PbSe and Sb₂Se₃ at 400 掳C.