Description of Anhydrous (Black) Dioptase as a S = 1/2 Uniform Antiferromagnetic Chain System

2009/12/22 by Joseph M. Law, Joseph M. Law, Constantin Hoch +3 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Crystal Structures and Properties #Multiferroics and related materials

paper · doi:10.1002/zaac.200900403

openalex publication_date 2009/12/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/25

Abstract

Abstract The structural and magnetic properties of anhydrous (black) dioptase, CuSiO 3 , were investigated by carrying out single‐crystal X‐ray diffraction, specific heat, and magnetic susceptibility measurements as well as by performing spin dimer analysis based on extended Hückel tight‐binding calculations. Our spin dimer analysis indicates that black dioptase is a S = 1/2 uniform antiferromagnetic chain system with the interchain spin exchange weaker than the intrachain exchange by three orders of magnitude. Specific heat and magnetic susceptibility measurements show that the intrachain exchange is –174(2) K, and the interchain exchange is of the order of ~2 K. They lead to long‐range magnetic ordering at about 5 K as evidenced by a broad anomaly in the specific heat.

Citations

• Recent advances in magnetic structure determination by neutron powder diffraction

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