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Elemental phosphorus exhibits fascinating structural varieties and versatile properties. The unique nature of phosphorus bonds can lead to the formation of extremely complex structures, and detailed structural information on some phosphorus polymorphs is yet to be investigated. In this study, we investigated an unidentified crystalline phase of phosphorus, type‐II red phosphorus (RP), by combining state‐of‐the‐art structural characterization techniques. Electron diffraction tomography, atomic‐resolution scanning transmission electron microscopy (STEM), powder X‐ray diffraction, and Raman spectroscopy were concurrently used to elucidate the hidden structural motifs and their packing in type‐II RP. Electron diffraction tomography, performed using individual crystalline nanowires, was used to identify a triclinic unit cell with volume of 5330 Å 3 , which is the largest unit cell for elemental phosphorus crystals up to now and contains approximately 250 phosphorus atoms. Atomic‐resolution STEM imaging, which was performed along different crystal‐zone axes, confirmed that the twisted wavy tubular motif is the basic building block of type‐II RP. Our study discovered and presented a new variation of building blocks in phosphorus, and it provides insights to clarify the complexities observed in phosphorus as well as other relevant systems.

Type‐II Red Phosphorus: Wavy Packing of Twisted Pentagonal Tubes