Attach2-Guidelines_PHASEDIAGRAMDiagrams2017.pdf

PHASE EQUILIBRIA DIAGRAMS

Guidelines for DIAGRAM EDITING AND MARKUP

Enlarged copies of diagrams are included for your markup with each paper. Diagrams should be edited for uniformity and presentation. (The technicians who digitize will work directly from the enlarged edited copy.)

White correction fluid and indelible red pencil are recommended for indicating changes on the enlarged copy.

A. General Editing Rules

1. The diagram should, of course, obey the phase rule. Indicate on the diagram with the aid of dashed lines where the phase rule is disobeyed and/or where the editor has modified the diagram to obey the phase rule, and discuss the region in the commentary. IN THE FUTURE, NO

COMMENTARY WILL BE PUBLISHED WITHOUT SOME EXPLICIT

STATEMENT REFERRING TO THE RELIABILITY AND

APPLICABILITY OF THE ACCOMPANYING DIAGRAM(S).

2. Remove all data points. Data points obscuring the liquidus or other lines must be deleted completely and the obscured portion hand drawn carefully. Other data points may be identified for removal (i.e., “remove all _, , , . . .” written on the enlarged diagram as an instruction to the technician). Indicate the grid only by short thick marks on sides, bottom, and top. (The exception is the calculated or optimized diagram in which data points are retained for comparison with the curves.)

3. Use dashed curves in areas where data are in doubt.

4. Label all components.

a. Give compounds as BaSiO3, not as BaO•SiO2. (Exceptions may be made if very large numbers are involved or if a homologous series exists.)

The hydrated compounds are excepted, i.e., CuSO4•5H2O.

b. To conserve space, compounds may be given in abbreviated notation, i.e., Ca2SiO4 given as C2S. The caption must then include the definition, C = CaO, S = SiO2. Define all abbreviations in the diagram in the Figure Caption.

5. Indicate units clearly.

a. Composition: whether mol% or wt%.

b. Temperature: generally in Celsius; exceptions are made for Kelvin or log reciprocal Kelvin.

c. Variables external to the diagram: P = 5 GPa, T = 450°C, etc.

6. Changes in detail may be made if other data published later are available. Make proper reference to publications or private communications.

Make such changes only if the new data are not in direct conflict with the original published data and if the changes are non-controversial. If another interpretation of the data is possible, it is better to provide a separate alternative diagram with appropriate comments included in the written commentary.

7. Check diagrams carefully for accuracy, e.g., are the stated compositions plotted correctly, etc.

B. Specific Rules for Binary Diagrams

1. For the composition scale on the base, label the percent of the component on the right. In most cases (0 to 100%), indicate compositions by 20, 40, 60, 80.

2. If unmarked, the temperature scale on the left will be assumed to be °C.

Only mark it so in special cases.

3. Add the melting points of the components and other invariant point temperatures to the diagram if given in the text.

4. Add the composition of invariant points of the diagram if given in the text.

Include eutectics, peritectics, monotectics, limits of solid solution, and critical points of two-liquid regions.

5. Label all liquid fields, line compounds, and solid solution regions where misunderstanding is possible. In many cases, it is not necessary and, indeed, is superfluous to label all fields. In the case of non-binary sections, however, label all fields.

6. Indicate the composition of binary compounds. Write labels for line compounds vertically along the line. If space is a factor, use abbreviations, or indicate compound ratios, i.e., 2:1 or 3:2, indicating the left-hand component first. Define abbreviations in the Figure Caption.

7. Mark all phases involved in solid solution “ss”. Show the elements involved in substitution where the substitution is simple, i.e., (Ba,Ca)O ss.

8. Indicate polymorphism clearly by symbols, i.e., α, β, etc. The symbol should be placed near the compound undergoing the phase transition. Add the transition temperature to the diagram if given in the text. Use the notation of the authors. If necessary to invent notation, use α to indicate the highest temperature form. Note all such assignments in the discussion.

C. Specific Rules for Ternary Diagrams

1. Place the melting points of congruently melting phases in parentheses under the formulas.

2. Label invariant points on the diagram by suitable uppercase letters, e.g., P1, P2, E1, E2, etc. List these points in a table in the commentary and key the points to the eutectic or peritectic letter designation in the diagram. See Section D of the Guidelines for Commentaries for table format. For points on limiting binaries, use the lowercase notation: 950°(p), 780°(e), 650°(min.).

3. Indicate the direction of falling temperature by arrows on cotectic lines.

4. Indicate Alkemade lines if known.

5. Indicate temperatures of isothermal sections or pressures of isobaric sections at upper right of the diagram.

6. In general, label composition ticks only on the base, assuming the scale is the same on the sides.

7. Label isotherms. If there are very many, label at least enough to permit interpretation of the diagram. Do not use ° with these numbers so that they are distinguished from invariant point temperatures.

8. Label liquid fields. On isothermal sections, label primary liquidus phase fields and unclear areas.

9. For isothermal sections, indicate distribution of tie lines in two-phase regions, if known. Label single phase regions separately.

10. On ternary diagrams indicate solid solution by cross-hatch lines.

D. Specific Rules for P-T Diagrams

1. Check that the scales on both left side and bottom are properly labeled. Use GPa, MPa, or Pa for pressure (1 bar ≅ 1 atm ≅ 105 Pa = 0.1 MPa).

2. The phases may be indicated by Roman numerals or any other suitable abbreviation. All abbreviations must be defined in the Figure Caption.