1. Different dopants including rare earth metals, alkali earth metals, transition metals and other elements are introduced, and the trend of the mixed oxides in exhaust purification is prospected.

2. Prices of some rare earth metals have doubled in just three weeks amid heavy stockpiling in China that has raised fears over global supplies.

3. China produces 97 percent of the world's rare earth metals, which are also used in the production of other high-tech and defense products.

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4. As a long - time researcher on rare earth metals, I have a say on the issue.

5. But shipments of various alloys that include rare earth metals to Japan have continued.

6. Rare earth metals have purifying and fining and alloying effects.

7. Electric cars require much larger motors, with more rare earth metals, than hybrids such as the Prius.

8. Rare earth metals, such as metallic neodymium and metallic didymium (metallic praseodymium -neodymium), are used for rare earth magnets, mainly neodymium-iron-boron magnet.

9. China'sdominant market position in the production of rare earth metals is producing abacklash for the country, he says.

10. He added: "It looks like we could reduce cost, weight and mass and avoid the geopolitical issues with the rare earth metals."

11. The halted shipments involved rare earth oxides, rare earth salts and pure rare earth metals — all of which are carefully tracked by customs officials for compliance with government export quotas.

12. Other types of magnets could be used in turbines, and rare earth metals could be recycled.

13. And now, allegedly, China has refused to export rare earth oxides, rare earth salts, and pure rare earth metals.

14. It requires that the military conduct an immediate review of its needs for rare earth metals, which are mined elements increasingly crucial in sophisticated technologies.

15. Today we continue our report on the group of chemical elements known as rare earth metals.

16. Of course, Beijing may react harshly to some of these measures and threaten a renewed embargo on the export of rare earth metals.

17. I wouldn't rely on my advice about the gold price, not if I were you: my professional expertise is in the rare earth metals, a very different game indeed.

18. Any car with an electric motor will use these rare earth metals," he added.

19. The main bottleneck, they argue, could be the production of rare earth metals such as neodymium, which is often used in making magnets.

20. The results show that the recovery rate increased as the increase of the content of rare earth metals in Sm-Eu-Gd concentrate and the purity of europia.

21. Rogue operations in southern China produce an estimated half of the world's supply of heavy rare earths, which are the most valuable kinds of rare earth metals.