What is strontium's melting point?

Answer 1

The melting point of strontium is 769 C according to both the 9th Edition of the Guinness of Answers and the ASM Handbook of Alloy Phase Diagrams Volume 3. The melting point of Stontium is 777 C according to the 89th Edition of the CRC Handbook of Chemistry and Physics. It is very difficult to obtain strontium in purities greater than 99.9 percent. The most common impurity is oxygen. The second most common impurity is calcium. In calcium, a 0.1 percent oxygen impurity can depress the melting point by 3 degrees from 842 C to 839 C see page 2-120 of the ASM Handbook of Alloy Phase Diagrams. I assume strontium behaves in the same manner. The 769 C value is probably too low due to insufficiently pure samples. Until further experiments are made by scientists using very high purity strontium 99.999 percent or better, the 777 C value in the CRC Handbook of Chemistry and Physics 89th Edition is probably the best value. The 777 C value may still be in error by several degrees.