Synthesis and superparamagnetic property of a Co–Cr Prussian blue analogue nanoparticles inside Nafion membrane

A nanoparticle-type of cobalt hexacyanochromate, image (particle diameter = 8 ± 2 nm) is prepared in Nafion. The nanoparticles show the superparamagnetism with blocking temperature (TB) of 8.5 K and an anisotropy energy barrier of 190 K. Magnetic hysteresis loops are observed below TB, e.g. 1.2 kOe at 2 K.