| 摘要 |
<p>A pigment capable of withstanding elevated temperatures such as 175 DEG C. is provided by the formation of a spinel of iron and other metal, such as Cu, Ca, Cd, Co, Ba, Sr, Mg, Mn, and Li. The pigment is made by a method which does not involve a step of calcining at high temperature, such as 600 DEG C, to 1100 DEG C., but rather involves precipitation from aqueous solution and subsequent exposure to elemental oxygen, as by aeration, to form submicron-sized particles of desired spinel. Colors other than yellow may be obtained, and the spinels of Fe-Ba and Fe-Sr have magnetic properties.</p> |
