What does PR stand for?

Praseodymium

This definition appears very rarely

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Samples in periodicals archive:

China supplies at least 95 percent of the world's rare earths -- 17 chemical elements with hard-to-pronounce names such as praseodymium and yttrium -- essential for a wide range of high-tech devices and green technologies.

China corners rare earths market

They’re generally clustered in a separate grouping at the bottom of the table, are known collectively as the lanthanoids, and these are their names, in order of atomic number (57-70): lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, and ytterbium.

Why all the fuss over rare earths?

The atoms of erbium or praseodymium can be pumped by high power light (pump laser) into excited state.

What Are Optical Fiber Amplifiers and How Do They Work?

2006) found that substituting praseodymium (Pr) for lanthanum increases the entropy change and adiabatic temperature change when magnetized from 0 to 5 Tesla by more than 30% compared to a similar material with no lanthanum substitution.

Recent developments in room temperature Active Magnetic Regenerative ...

Of the lanthanide series, lanthanum, cerium, praseodymium, and ytterbium have been most often examined.

Smart corrosion inhibition strategies: substrate, coating, and ...

Boatner, Structural refinements of praseodymium and neodymium orthophosphate.

Contamination in the rare-earth element orthophosphate reference ...

at Mitsubishi Heavy Industries report clear evidence of transmutation of cesium to praseodymium by the diffusion of deuterium through a thin film on a specially prepared substrate, under room temperature and atmospheric pressure conditions.

Energy Perspectives 2002