angew. chem. intl. edn. engl. - ucsb mrsecseshadri/2010_286g/intermetallics.pdfr. nesper, bonding...
TRANSCRIPT
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl1
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
“Int
erm
etal
licph
ases
hav
e lo
ng b
een
amon
g th
e bl
ack
shee
p in
the
fam
ily o
f ch
emic
al c
ompo
unds
. Th
eir
chem
ical
bon
ding
has
elu
ded
desc
ript
ion
by t
he v
alen
ce
rule
s, w
hich
oth
erw
ise
are
extr
emel
y ef
fect
ive.
As
a re
sult
, un
ders
tand
ing
of t
he
stru
ctur
e-bo
ndin
g re
lati
onsh
ips
in t
hese
pha
ses
to d
ate
has
rem
aine
d ne
bulo
us,
even
tho
ugh
they
fo
rm t
he la
rges
t gr
oup
of
inor
gani
c co
mpo
unds
.”
R. N
espe
r, B
ondi
ng p
atte
rns
in in
term
etal
licco
mpo
unds
, A
ngew
. Ch
em.
Intl
. Ed
n.
Engl
.30
(199
1) 7
89.
http://www3.interscience.wiley.com/cgi-bin/abstract/106587525/ABSTRACThttp://www3.interscience.wiley.com/cgi-bin/abstract/106587525/ABSTRACT
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl2
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Au-C
u ph
ase
diag
ram
: Au
Cuan
d Au
Cu3
AuCu
: P4
/mm
ma
= 2.
802
Å, c
= 3.
671
ÅAu
at
0,0,
0 an
d Cu
at
½½
½
AuCu
3: P
m-3
ma
= 3.
753
ÅAu
at
0,0,
0 an
d Cu
at
½½
0
Ord
er-d
isor
der
phas
e tr
ansi
tion
s !
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl3
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Mod
ulat
ed Im
ma
stru
ctur
e of
AuC
u: 2
0 at
oms
per
unit
cel
l.a
= 3.
676(
2);
b=
3.95
6(3)
; c
= 3
9.72
(2)
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl4
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Ti-A
l pha
ses
TiAl
P4/m
mm
TiAl
3I4
/mm
m
Ti2A
l 5I4
/mm
mTiAl Ti/A
l
Al r
ich
(Al i
s fc
c)
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl5
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Ti-A
l pha
ses
Ti3A
l
Ti r
ich
(Ti i
s hc
p)
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl6
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Ni-
Al p
hase
s
NiA
l(Cs
Cl)
Ni 3
Al (
Cu3A
u)
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl7
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Ni-
Al p
hase
s
NiA
l 3
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl8
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Os-
Al p
hase
s
OsA
l(Cs
Cl)
OsA
l 2
Os 2
Al3
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl9
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
esM
g-Al
pha
ses:
Mg 1
2Al 1
7
Mg 2
3Al 3
0
Topo
logi
call
y cl
ose
pack
ed p
hase
s
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl10
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Abin
itio
stu
dy o
f po
lyte
trah
edra
lpa
ckin
g: T
he A
l-M
g sy
stem
, S
. N
aras
imha
nan
d J.
W.
Dav
enpo
rt,
Phys
. Re
v. B
51(1
995)
659
.
Unu
sual
top
olog
ies
are
just
ifie
d by
the
Fer
mi e
nerg
ies
lyin
g in
ps
eudo
gaps
and
dips
. Th
is is
as
soci
ated
wit
h un
usua
l st
oich
iom
etri
esan
d ve
ry la
rge
unit
cel
ls.
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl11
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
Pola
r in
term
etal
licco
mpo
unds
: Co
mpo
unds
of
earl
y an
d la
te t
rans
itio
n el
emen
ts.
Tran
siti
on m
etal
all
oys
of e
xtra
ordi
nary
sta
bili
ty –
exam
ple
of
gene
rali
zed
Lew
si-a
cid-
base
int
erac
tion
s in
met
alli
c sy
stem
s, L
. Br
ewer
an
d P.
R.
Wen
gert
, M
etal
. Tr
ans.
4(1
973)
83.
DO
S of
CoT
iin
the
CsCl
stru
ctur
e.N
ote
that
Co
dis
alm
ost
full
and
Ti d
is a
lmos
t em
pty.
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl12
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
es
A15
com
poun
ds (
supe
rcon
duct
ors)
Nb 3
Sn:
Pm-3
n(2
23)
a =
5.29
0 Å
Snat
0 0
0N
bat
¼0
½
-
Mat
eria
ls 2
86 G
: St
ruct
ural
Fam
ilies
of
Func
tion
al In
orga
nic
Mat
eria
lsRa
m S
esha
dri x
6129
ses
hadr
i@m
rl13
Clas
s 11
: St
ruct
ures
of
inte
rmet
allic
phas
esM
athi
as’
Rule
s:
D.
Dew
-Hug
hes,
Rep.
Pro
g. P
hys.
34(1
971)
821
-873
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