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Title: KCu 7 P 3 : A Two-Dimensional Noncentrosymmetric Metallic Pnictide

Journal Article · · Inorganic Chemistry

We introduce a 2D material, KCu7P3, with a noncentrosymmetric structure (trigonal space group P31m, a = 6.9637(2) Å, c = 24.1338 (10) Å), which forms both from a molten potassium polyphosphide flux and from the elements. This phase consists of infinite [KCu7P3]– layers with hexagonal P sheets separated by K+ ions. The structure of the layers is unique yet related to both Cu3P and the CaCu4P2 structure-types. Single-crystal refinement reveals extensive disorder within the Cu3P-like slabs. KCu7P3 is paramagnetic and exhibits a room temperature resistivity of ~335 μΩ cm with a metal-like temperature dependence. The metallic character is backed by density functional theory electronic structure calculations. Hall and Seebeck effect measurements yield p-type behavior with a hole mobility of ~15 cm2 V–1 s–1 at 300 K and a carrier concentration on the order of 1021 cm–3. KCu7P3 is chemically stable in ambient conditions, as well as in aqueous neutral and acidic solutions.

Research Organization:
Argonne National Lab. (ANL), Lemont, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1557245
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 15 Vol. 58; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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