A phase equilibrium diagram for t he system BaO-B, 0 3-S iO, has bee n co n s~ru c te d fr·om data, o btained esse ntiall y by th e quenching met hod, o n 178 te rnary co mpOS it IOn s . One ne w co mpo und, 3Ba· 03B, 9 3· 28 i9" melt in g .at 1,009: C a n.d pos~ess in g an ext~·e m e l y ,t1at primary fi e ld appears, and Its op t ical prope rt ies and X-ray dIffractIOn data a re ~I ve n . [he BaO· 4B,0 3 and 8 iO, prima r y phase areas lllclude alm ost 70 perce nt of t he diagram , a nd o ver these areas exis ts a large region of t wo-liquid immiscibili ty. Limi ted da ta indi cates t hat t he immiscibi lity ga p dec reases wi t h increasing te mpe rat ure. The solid so lu t io n regio n betwee n 2BaO · 38 iO, and BaO·2SiO, ex te nds in to t he in te ri o r of t he diagram a nd is co mplex in nat ure. An isofr-a ct diagram fo r t he quenc hed glasses is s hown . F or precise te mpe rat ure con t ro l of a qu enchin g furn ace, a self-adjustin g, bridge-ty pe con t roll er is desc r ibed briefly .
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