-Cesium Chloride

-Rock Salt

-Nickel Arsenide

-Sphalerite

-Wurtzite

SC lattice of anions, cubic holes filled with cations

ex:CsCl, CaS, TlCl, CsCN

[CN(M,X)=8)

FCC lattice of anions X in which cations M occupy octahedral holes

ex: NaCl, LiCl, MgO, TiO, NiO, ScN

[CN(M,X)=6

HCP lattice of anions X, octahedral holes filled with M, X atoms surrounded in trigonal prismatic arrangement of M

ex: NiAs, NiS, FeS, CoS, CoTe

[CN(M,X)=6]

Sphalerite

FCC lattice of anions X in which cations M occupy tetrahedral holes

ex: ZnS, CuCl, CdS, HgS, GaP, InAs, CuFeS₂

[CN(M,X)=4]

HCP lattice of anions X in which cations M occupy tetrahedral holes

ex: ZnS, ZnO, BeO, AgI, SiC, InN, NH₄F

[CN(M,X)=4]

-fluorite

-antifluorite

FCC lattice of cations M in which anions X occupy tetrahedral holes

(CsCl structure in which on half of the cations are absent)

ex: CaF₂, UO₂, CeO₂, BaCl₂, HgF₂, PbO₂

[CN(M)=8, CN(X)=4]

FCC lattice of anions X in which cations M occupy tetrahedral holes

(inverse of fluorite structure)

ex: M₂O and M₂S (M= Li, Na, K) 

[CN(M)=4, CN(X)=8]

cubic lattice with B (or A) at unit cell corners, X on edges, and A (or B) at the center

ex: CaTiO₃, BaTiO₃, SrTiO₃, RbCaF₃

[CN(A)=12, CN(B)=6]

High resonance and large coercivity (> 100e)

-once polarized, will remain polarized=> useful as permanent magnetic material

Few defects and small coercivity (narrow loop, easily demagnetized)

=> usefule in electromagnets and transformer cores

Remanant magnetization 

(on the y axis of the hysterisis loop where the line crosses it)

magnetization oriented slightly more in one direction

Coercive field

(on the x axis where the curve meets it)

everything is exactly cancelled

1. High spin ground state, S=large

2. Axial zero-field splitting (D<0 => large -D is good)

3. Strong exchange coupling (|J|= large)

Long range (~10 nm) => will diffract x-rays

-molecular

-covalent

-ionic

-metallic

(...ABCABCABC...)

CN=12

space filled= 74.05%

CN= 6

space filled= 52.36%

CN= 8

space filled = 68.02%

(...ABABABABAB...)

CN= 12

space filled= 74.05%

Van't Hoff

ΔH > 0

-endothermic

K₂>K₁

A_(s) is deposited at cooler end (T₁)

Van't Hoff

ΔH< 0

-exothermic

K₁>K₂

A_(s) is deposited at hotter end (T₂)

negative

adds electrons to LUMO

think positive! 

empty HOMO 

1. Dipole-Dipole

2.Heisenburg Exchange

3. Super Exchange

4. Double Exchange

only worry about this at low temperatures

(between Metal-Metal bonds)

weak when apart, strong when close

(direct Metal-Metal interactions)

J>0 exchange energy is minimum for parallel spins (ferromagnet)

J<0 exchange energy is minimum for antiparallel spins (antiferromagnet)

exchange energy is dependent upon symmetry/overlap

exchange energy between metal-ligand bonds

(imagine p orbitals interacting with d_x²-y²)

paramagnet--> magnetic ordering below a certain temperature

-T_c= curie temp (ferri and ferro)

-T_N= Neel temp (antiferro)

tetrahedral

CN=4

ZnS

octahedral

CN=6

NaCl

cubic

CN=8

CsCl

cubic

CN=8

Fluorite

CaF₂ 

octahedral

CN=6

Rutile

TiO₂