# Spinodal

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## Definition of the adjective Spinodal

What does Spinodal mean as an attribute of a noun?

**adjective**

- [
*chemistry*] Describing the transformation of a system of two or more components in a metastable phase into two stable phases

## Explanation

**Spinodal**: In thermodynamics, the limit of local stability with respect to small fluctuations is clearly defined by the condition that the second derivative of Gibbs free energy is zero. The locus of these points is known as the spinodal curve. For compositions within this curve, infinitesimally small fluctuations in composition and density will lead to phase separation via spinodal decomposition. Outside of the curve, the solution will be at least metastable with respect to fluctuations. In other words, outside of the spinodal curve some careful process may obtain a single phase system. Inside of it, only processes far from thermodynamic equilibrium, such as physical vapor deposition, will allow to prepare single phase compositions. The local points of coexisting compositions, defined by the common tangent construction, are known as binodal curve, which denotes the minimum-energy equilibrium state of the system. Increasing temperature results in a decreasing difference between mixing entropy and mixing enthalpy, thus, the coexisting compositions come closer. The binodal curve forms the bases for the miscibility gap in a phase diagram.

## Printed dictionaries and other books with definitions for Spinodal

Click on a title to look inside that book (if available):

### Complex Inorganic Solids (2007)

Structural, Stability, and Magnetic Properties of Alloys by Patrice E. A. Turchi, Antonios Gonis, Krishna Rajan, Annemarie Meike

*composition: If the second derivative at the given composition is negative, then
phase separation should happen spontaneously and is called spinodal*
decomposition, the line in the phase diagram where d'g/dc =0 being termed a

**spinodal**.

### Analysis, Modeling and Simulation of Multiscale Problems (2006)

by Alexander Mielke

*The early stage of the separation process, where
different phases, characterized by the respective concentrations of the alloy
components, appear is called spinodal* decomposition. The Cahn-Hilliard model [
CH58] ...

### Concise Dictionary of Materials Science (2002)

Structure and Characterization of Polycrystalline Materials by Vladimir Novikov

**spinodal** In a phase diagram, locus corresponding to the inflection
points on the curve of the free energy of solid solution, G, vs. its composition, c, at
different temperatures. Under the locus the second derivative ∂2G/∂ c 2 is ...

### A Dictionary of Chemistry (2016)

by Richard Rennie, Jonathan Law

**spinodal** curve A curve that separates a metastable region
from an unstable region in the coexistence region of a binary fluid. Above **the
spinodal** ...

### Encyclopedia of Chemical Physics and Physical Chemistry: Applications (2001)

by Nicholas D. Spencer, John H. Moore

**The broken curve is the spinodal**. It is not always possible to describe the
variations of AGmix(</>A. T) with / depending only on temperature. For some
systems, the dependence of x on the volume fraction must be considered too.
However, the ...

### Encyclopedia of Polymer Blends, Volume 3 (2016)

Structure by Avraam I. Isayev

**The spinodal** curve separates metastable and unstable (unconditionally two-
phase) regions, where the curvature of the free energy versus composition graph
changes from positive to negative and the second derivative of ΔGmix is zero.

### Encyclopedia of Polymer Blends, Volume 1 (2016)

Fundamentals by Avraam I. Isayev

Bulk **spinodal** decomposition in TMPC/PS [TMPC = poly(tetramethyl-Bisphenol-A
-polycarbonate)] films was also studied by Cabral et al. [151] using AFM. These
authors were able to show that the topography observed by AFM is related to the
...

### Comprehensive Dictionary of Chemical Engineering (2015)

by Muhammad Rashid Usman

**Spinodal** curve: In a three-component (ternary) phase diagram, the two-phase
region or demixing zone is bounded by a series of composition points called as
binodal curve. The mixtures inside a binodal curve usually, but not always,
separate ...

### Dictionary of Colloid and Surface Science (1989)

by Paul Becher

**spinodal** ...

### Concise Encyclopedia of Magnetic and Superconducting Materials (2005)

by K.H.J. Buschow

This particular microstructure can be attained by a heat treatment leading to **the
so-called spinodal** decomposition of the alloy, which is described briefly below.
For more details the reader is referred to the review by McCaig and Clegg (1987).

## Online dictionaries and encyclopedias with entries for Spinodal

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## Video about Spinodal

**Spinodal Meaning**

Video shows what spinodal means. Describing the transformation of a system of two or more components in a metastable phase into two stable phases.

## Scrabble value of S_{1}P_{3}I_{1}N_{1}O_{1}D_{2}A_{1}L_{1}

The value of this 8-letter word is 11 points, but it's not an accepted word in the Official Scrabble Players Dictionary.

## Anagrams of SPINODAL

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