< lb

O C . min. 36.36. 36.36. 27.27 (Mg4NaaPb3). 600.7. 23. 383.8. < lb. 37.50. 37.50. 25.00 (Mg&a3Pbz). 589.8. 7. 559.9. 7. 35.00. 35.00. 30.00 (Mg,Na?Pbe...
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March, 1946

NOTES

Four alloys of compositions immediately surrounding the Mg4Na4Pb3 peak in the ternary diagram were analyzed thermally in order to define the compound region; the experimental data are given below.

which appeared to be the desoxyxyloin (11).

52 1

OH

I

OH

I

XylCH-CHXyl I

XylCOCHzXyl

I1

THERMAL ANALYSIS OF Mg4Na4Pb3REGIONOF Mg-Na-Pb SYSTEM

_~____-

m

Na

Atom % a

Pb

-PrimaryTemp.,

C.

Time, min.

Temperature breaks ---SecondaryTemp., Time, OC. min.

--TertiaryTemp., O C .

-. Time, min.

36.36 36.36 27.27 (Mg4NaaPb3) 600.7 23 383.8 < lb 37.50 37.50 25.00 (Mg&a3Pbz) 589.8 7 559.9 7 35.00 35.00 30.00 (Mg,Na?Pbe) 583.0 9 476.8 3 407.9