Title | Self-directed task - Reading a ternary phase diagram.pdf |
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Course | Design for "X" |
Institution | Northumbria University |
Pages | 2 |
File Size | 163.7 KB |
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Total Downloads | 40 |
Total Views | 131 |
Download Self-directed task - Reading a ternary phase diagram.pdf PDF
Reading a ternary phase diagram Aternarydiagramisatriangle,witheachofthe threeapexesrepresentingacomposition,suchas sandstone,shale,andlimestone.ForthemomenttheyarelabelledA,B,andC.Wearegoingtotake thediagramaparttoseehowitworks. Thedrawingtothelefthasonlytheskeletonofthetrianglepresent as we concentrate on point A. Point A is at the top of the heavy vertical redline(arrow).Alongthis lineisindicatedpercentofA.A point plotted at the top of the vertical line nearest A indicates 100%A.Ahorizontalbaratthebottomoftheline(farthestfromA) represents0%ofA.Anyotherpercentagecanbeindicatedbyaline appropriately located along the line between 0% and 100%, as shownbythenumbersofftotheright. Thehorizontallinesthatrepresent various percents of A can beof anylengthsince theyrunparalleltothebaseline andremainthe same distance from the bottom and top of the triangle. The lines are projected out to the right of the red arrow line just as far as where the imaginary side of the triangle will be, and their percentageabundanceswrittenalongthe rightsideofthetriangle. By doing this the right side of the triangle becomes the scale for percentabundanceofA. To be complete the horizontal lines also extend to the left until theycontactthe leftsideof theimaginarytriangle,but nopercent abundancesarewrittenthere.Inthefinalternarydiagramthered verticalarrowisremoved. Point B is at the lower left apex of the triangle. We construct a percentabundancescaleforBbyrotatingtheheavyred scaleline 120degreescounterclockwisesothatitrunsfromtherightsideof the triangle to the lower left corner. The right side of the triangle nowbecomes thebaselinefor thepercentscaleforB,andaseries ofredlineshavebeendrawnparalleltothetriangle'srightsideto markoffthepercentages.Theselinesareprojectedout totheleft and bottom sides of the triangle, and the percent scale for B laid outalongtheleftside. PointCisatthelowerrightapexofthetriangle.Weconstructthe percentabundancescaleforCbyrotatingtheheavyredscaleline another120degreessothatitrunsfromthe leftsideofthetriangleto the lowerrightcorner,and thepercentscalelinesandpercentabundancenumbersrotatewithit. Thesumresultistheternarydiagramtotherightwithallthescalespresent.Notethattheheavyred lines are not included in this final triangle. Also observe that the ternary diagram is read counter clockwise.
So,somepractice.Notethenumbers1‐4onthediagram.The compositionforeachofthesepoints isshownbelow.Seeifyouagree. 1.60%A|20%B|20%C=100% 2.25%A|40%B|35%C=100% 3.10%A|70%B|20%C=100% 4.0.0%A|25%B|75%C=100%
However,incommonuse,ternarydiagramsusuallydonothavethe"AScale","BScale","CScale"on them. Also, even the percent numbers are absent. So, you must learn to read these diagrams withoutallthoseaids. Reference:http://csmres.jmu.edu/geollab/fichter/SedRx/readternary.html...