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Elara pulled one out. āSee? The top has the chemical name, the formula. Then three lines of the strongest ād-spacingsāāthe distances between atomic planes. Then a column of all the peaks: angle, intensity, the Miller indices of the crystal planes. And at the bottom, the conditions: āCu KĪ± radiation, 25Ā°C.āā
He realized something profound. The JCPDS was not a database. It was a covenant. Every time a scientist ran an XRD pattern, they were standing on the shoulders of thousands of anonymous librarians of the crystal world. The JCPDS had answered the most arrogant question a scientist could ask: āI have a grain of dust. Tell me exactly what it is.ā jcpds xrd
Leo gasped. āThatās a Martian mineral! A sulfate hydrate formed in freezing brine.ā Elara pulled one out
āIn 1969,ā Elara continued, āthe JCPDS became the International Centre for Diffraction Data (ICDD). But the name JCPDS stuck like glue. It was too legendary. And the card catalog went digitalāfirst magnetic tape, then CD-ROM, now the cloud. The PDF grew to contain over a million unique entries.ā The JCPDS was not a database
