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dielectric constant A
charge when subject to monotectoid reaction The transformatio
cooling, of a solid phase isothermally and
1-19-98 plm 3-21-98 MP
two solids having different compositions fr
martensite ﬁnish temperature Mf In iron-carbon
n-type A class of extrinsic semiconducto
martensites, the temperature at Chapter 2 the transformation
which Atomic Scale Structures
dopant atoms with more than four valence
of austenite to martensite is complete. For other systems,
natural aging The precipitation of a sec
Mf is the temperature at which Cl the parent phase has
from a supersaturated solution at room tem
transformed to the product phase.
Nernst equation An equation that relat
martensite start temperature Ms In iron-carbon
electrochemical cell potential to the activit
martensites, the temperature at which the transformation
reactants and products.
of austenite to martensite is just beginning. For other
network former An element in a chain
systems, Ms is the temperature +17 which the parent phase
forming at least three bonds with its neigh
is just beginning to transform to the product phase.
(trifunctionality) or an ion that satisﬁes Za
martensitic transformation A shearlike
rules. They are good glass formers.
transformation with no change in composition when the
network modiﬁer An ion that is not ca
parent phase transforms into the product phase.
FIGURE 2.4–3 A schematic illustration of a covalent bond formed between two Cl atoms resulting in the formation
forming three or more bonds with its neig
matrix phase The material used in a composite to ﬁll
of a Cl2 molecule.
in the context of an oxide glass. Network m
the space between ﬁbers or other reinforcement with the
disrupt three-dimensional networks. They
primary constants and p q. them together and to provide
where A and B are positivepurpose of bondingThe bond-force and bond-energy
curves for covalently bonded materials have the same general shape as those for ionic
them with lateral strength.
materials. mean time between collisions The average time
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