固溶体

WordNet

uninterrupted in space; having no gaps or breaks; "a solid line across the page"; "solid sheets of water"
the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape (同)solidness, solid_state
a three-dimensional shape
matter that is solid at room temperature and pressure
of the same color throughout; "solid color" (同)self-colored, self-coloured
of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings" (同)strong, substantial
acting together as a single undiversified whole; "a solid voting bloc" (同)unanimous, whole
characterized by good substantial quality; "solid comfort"; "a solid base hit"
entirely of one substance with no holes inside; "a solid block of wood"
financially sound; "the bank is solid and will survive this attack"
having three dimensions; "a solid object"
impenetrable for the eye; "solid blackness"
of a substantial character and not frivolous or superficial; "work of solid scholarship"; "based on solid facts"
of definite shape and volume; firm; neither liquid nor gaseous; "ice is water in the solid state"
of one substance or character throughout; "solid gold"; "carved out of solid rock"
a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution; "he used a solution of peroxide and water"
the successful action of solving a problem; "the solution took three hours"
a statement that solves a problem or explains how to solve the problem; "they were trying to find a peaceful solution"; "the answers were in the back of the book"; "he computed the result to four decimal places" (同)answer, result, resolution, solvent
the set of values that give a true statement when substituted into an equation (同)root
a method for solving a problem; "the easy solution is to look it up in the handbook"
a colloid that has a continuous liquid phase in which a solid is suspended in a liquid (同)colloidal_solution, colloidal suspension
the syllable naming the fifth (dominant) note of any musical scale in solmization (同)soh, so

PrepTutorEJDIC

『固体の』,『固形の』 / 『うつろでない』,中身のつまった / (物質の)密度が高い,密な;(印刷の)行の詰まった / 《名詞の前にのみ用いて》『混じりもののない』,純正の / (構造的に)『堅固な』 / (人が)『信頼できる』,堅実な / 健全な,しっかりした / 一致した,団結した / (時間が)まるまる,切れ目のない;(物が)連続した / 三次元の,立体の,立方の / 『固体』,固形物 / 立方体
〈U〉(問題などを)『解くこと』,解明,解決法《+『of』(『for, to』)+『名』》 / 〈C〉(問題などの)『解答』,説明《+『of』(『to, for』)+『名』》 / 〈C〉〈U〉(…の)『溶液』《+『of』+『名』》 / 〈U〉溶解
ソ(全音階の第5音)
ソル(ペルーの貨幣単位で青銅貨)

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/12/04 19:17:28」(JST)

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Fig. 1 A binary phase diagram displaying solid solutions over the full range of relative concentrations.

IUPAC definition

Solid in which components are compatible and form a unique phase.

Note 1: The definition “crystal containing a second constituent which fits into and
is distributed in the lattice of the host crystal” given in refs.,^[1]^[2] is not general
and, thus, is not recommended.

Note 2: The expression is to be used to describe a solid phase containing
more than one substance when, for convenience, one (or more) of the substances,
called the solvent, is treated differently from the other substances, called solutes.

Note 3: One or several of the components can be macromolecules. Some of
the other components can then act as plasticizers, i.e., as molecularly dispersed
substances that decrease the glass-transition temperature at which the amorphous
phase of a polymer is converted between glassy and rubbery states.

Note 4: In pharmaceutical preparations, the concept of solid solution is often
applied to the case of mixtures of drug and polymer.

Note 5: The number of drug molecules that do behave as solvent (plasticizer)
of polymers is small.^[3]

A solid solution is a solid-state solution of one or more solutes in a solvent. Such a mixture is considered a solution rather than a compound when the crystal structure of the solvent remains unchanged by addition of the solutes, and when the mixture remains in a single homogeneous phase. This often happens when the two elements (generally metals) involved are close together on the periodic table; conversely, a chemical compound generally results when two metals involved are not near each other on the periodic table.^[4]

The solid solution needs to be distinguished from a mechanical mixture of powdered solids like two salts, sugar and salt, etc. The mechanical mixtures have total or partial miscibility gap in solid state. Examples of solid solutions include crystallized salts from their liquid mixture, metal alloys, moist solids. In the case of metal alloys intermetallic compounds occur frequently.

Details

The solute may incorporate into the solvent crystal lattice substitutionally, by replacing a solvent particle in the lattice, or interstitially, by fitting into the space between solvent particles. Both of these types of solid solution affect the properties of the material by distorting the crystal lattice and disrupting the physical and electrical homogeneity of the solvent material.^[5]

Some mixtures will readily form solid solutions over a range of concentrations, while other mixtures will not form solid solutions at all. The propensity for any two substances to form a solid solution is a complicated matter involving the chemical, crystallographic, and quantum properties of the substances in question. Substitutional solid solutions, in accordance with the Hume-Rothery rules, may form if the solute and solvent have:

Similar atomic radii (15% or less difference)
Same crystal structure
Similar electronegativities
Similar valency

The phase diagram in Fig. 1 displays an alloy of two metals which forms a solid solution at all relative concentrations of the two species. In this case, the pure phase of each element is of the same crystal structure, and the similar properties of the two elements allow for unbiased substitution through the full range of relative concentrations.

Solid solutions have important commercial and industrial applications, as such mixtures often have superior properties to pure materials. Many metal alloys are solid solutions. Even small amounts of solute can affect the electrical and physical properties of the solvent.

Fig. 2 This binary phase diagram shows two solid solutions: and .

The binary phase diagram in Fig. 2 shows the phases of a mixture of two substances in varying concentrations, and . The region labeled "" is a solid solution, with acting as the solute in a matrix of . On the other end of the concentration scale, the region labeled "" is also a solid solution, with acting as the solute in a matrix of . The large solid region in between the and solid solutions, labeled " + ", is not a solid solution. Instead, an examination of the microstructure of a mixture in this range would reveal two phases — solid solution -in- and solid solution -in- would form separate phases, perhaps lamella or grains.

Application

In the phase diagram, at three different concentrations, the material will be solid until it's heated to its melting point, and then (after adding the heat of fusion) become liquid at that same temperature:

the unalloyed extreme left
the unalloyed extreme right
the dip in the center (the eutectic composition).

At other proportions, the material will enter a mushy or pasty phase until it warms up to being completely melted.

The mixture at the dip point of the diagram is called a eutectic alloy. Lead-tin mixtures formulated at that point (37/63 mixture) are useful when soldering electronic components, particularly if done manually, since the solid phase is quickly entered as the solder cools. In contrast, when lead-tin mixtures were used to solder seams in automobile bodies a pasty state enabled a shape to be formed with a wooden paddle or tool, so a 70-30 lead to tin ratio was used. (Lead is being removed from such applications owing to its toxicity and consequent difficulty in recycling devices and components that include lead.)

Exsolution

When a solid solution becomes unstable — due to a lower temperature, for example — exsolution occurs and the two phases separate into distinct microscopic to megascopic lamellae. This is mainly caused by difference in cation size. Cations which have a large difference in radii are not likely to readily substitute.^[6]

Take the alkali feldspar minerals for example, whose end members are albite, NaAlSi₃O₈ and microcline, KAlSi₃O₈. At high temperatures Na⁺ and K⁺ readily substitute for each other and so the minerals will form a solid solution, yet at low temperatures albite can only substitute a small amount of K⁺ and the same applies for Na⁺ in the microcline. This leads to exsolution where they will separate into two separate phases. In the case of the alkali feldspar minerals, thin white albite layers will alternate between typically pink microcline.^[6]

References

^ Alan D. MacNaught, Andrew R. Wilkinson, ed. (1997). Compendium of Chemical Terminology: IUPAC Recommendations (2nd ed.). Blackwell Science. ISBN 0865426848.
^ Compendium of Analytical Nomenclature (the "Orange Book"). Oxford: Blackwell Science. 1998. ISBN 0865426155.
^ "Terminology for biorelated polymers and applications (IUPAC Recommendations 2012)" (PDF). Pure and Applied Chemistry 84 (2): 377–410. 2012. doi:10.1351/PAC-REC-10-12-04.
^ Cottrell, Alan Howard (1967). An Introduction to Metallurgy. Institute of Materials. ISBN 0-8448-0767-2.
^ Callister Jr., William D. (2006). Materials Science and Engineering: An Introduction (7th ed.). John Wiley & Sons. ISBN 0-471-35446-5.
^ ^a ^b Nesse, William D. (2000). Introduction to Mineralogy. New York: Oxford University Press. p91-92. ISBN 978-0-19-510691-6

Chen, Jing; Xu, Zhi-qin; Chen, Z-Z.; Li, T-F.; Chen, F-Y. (December 2005). "Pargasite and ilmenite exsolution texture in clinopyroxene from the Hujialing Garnet-Pyroxenite, Su-lu U.H.P. Terrane, Central China: A geodynamic Implication" (PDF). European Journal of Mineralogy 17 (6): 895–903. doi:10.1127/0935-1221/2005/0017-0895.
Petersen, U. "Introduction to Ore Microscopy II; Mineral Paragenesis" (PDF).

External links

DoITPoMS Teaching and Learning Package- "Solid Solutions"

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