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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