Chemists find path to 'new blue' in meteorite minerals

Scientist Mas Subramanian of Oregon State University, who made history a decade ago with the accidental discovery of the first new blue inorganic pigment in more than two centuries, is again pushing forward the science of color.

Researchers have determined the key structural ingredients for making vivid blue colors. Photo: OSU

Analyzing the crystal structure of pigments based on hibonite, a mineral found in meteorites, Subramanian has paved the way for more pigments with vivid hues that are stable, durable and non-toxic.

Subramanian discovered YlnMn blue in 2009 when he was experimenting with new materials that could be used in electronics applications.

"NSF's Division of Materials Research supports discovery, synthesis and characterization of new types of materials, and studies to understand their crystal structures, chemical bonding and physical properties." said program director Birgit Schwenzer. "Subramanian's research shows that new materials with specific superior properties can still be discovered, either serendipitously or through targeted materials design strategies."

Through much of human history, people around the world have sought inorganic compounds that could be used to paint things blue, often with limited success. Most had environmental or durability issues.

"Most pigments are discovered by chance," Subramanian said. "The color of a material depends not only on the chemical composition, but also on the intricate arrangement of atoms in the crystal structure."

Before YInMn blue, the last blue discovery was cobalt aluminum oxide-based blue, synthesized by a French chemist in 1802. Cobalt blue production, however, requires a significant amount of a cobalt salt that is hazardous to humans and the environment.

Now, by analyzing the structure of hibonite-based blue pigments, Subramanian has developed a way to match or surpass cobalt blue's vividness while using much less of the harmful carcinogenic cobalt ion or replacing it entirely.

"In nature, hibonite is only found in meteorites that have been subjected to thousands of degrees of temperature when they go through Earth's atmosphere, so it makes sense that the structure is remarkably stable," he said. "These kinds of mineral structures are probably the future for designing durable and safe inorganic pigments." (National Science Foundation)

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