Structural, Transport and Magnetic Properties of KxCoO2 (x = 0.36)

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2005,（6）
• 页码范围: 1478-1480
• 页数: 3页
• 语种: 英文

摘要

Layered potassium cobaltate Kx CoO2 with x = 0.36 has been successfully synthesized in KOH fluxes at 480 ℃,and its hydrated form K0.36CoO2· yH2O (y ≤ 0.8) has been obtained by intercalation with water. The diffraction peaks of K0.36CoO2 can be indexed by an orthorhombic cell similar to Na0.5CoO2, and K0.36CoO2.0.8H2O is isostructural with its sodium analog, monolayer hydrate NaxCoO2 · yH2O. While the samples KxCoO2 and K0.36 CoO2yH2O (y＜0.8) show semiconductor behaviour, a metal-insulator transition around 30 K was observed in the sample Kx CoO2.0.8H2O. Both the samples show complicated magnetic behaviour, and they are primarily paramagnetic in the range from 5 K to 300 K with a spin-glass-like transition around 56 K.