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Rubidium Chloride

Crystal: RbCl

Structure: NaCl

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Lattice formation energy:

-6.91 eV

Lattice parameter:

3.27 Å (3.259 at 0K.)

Density:

g/cm3

Remark: CsCl form also occurs.

Lattice parameter: 3.24 for CsCl form

Stiffness constants: in 1011 dynes/cm2, at room temperature

 

c11: 4.295 (4.499 at 0K.) (Ref.1, also Other Information)

c12: 0.649 (0.676 at 0K.)

c44: 0.493 (0.497 at 0K.)

More information:

Third order elastic constants of Rubidium Chloride, R.J. Wallat & J. Holder, J. Phys .Chem. Sol. 38, 1227 (1977)

 

Compressibility (in 1011 dynes/cm2): 0.536 ??

Poisson ratio:

 

Debye temperature: 168 K

Melting temperature: K

 

Phonon spectrum discussed by:

G. Raunio & S. Rolandson, Lattice dynamics of NaCl, KCl, RbCl & RbF, Phys. Rev. B2, 2098 (1970)

 

Transverse optic phonon T0 (k=0): 126 cm-1 or 2.22*1013/sec.

Longitude optic phonon L0 (k=0): 182 cm-1 (Hodby)

 

Gruneissen constant:

Ratio e*/e: 0.84

 

Photoelastic constants:

p11:

p12:

p44:

 

 

Band gap:

direct: eV. at K

indirect: eV. at ° K

 

Plasmon energy: eV.

Exciton energy: 7.54 eV. (Ref.2)

 

Band structure discussed by:

 

More information:

Ultraviolet electron spectra of Rubidium halides, C.S. Inouye & W. Pong, Phys. Rev. B15, 2265 (1972)

 

Static dielectric constant: 5.0 or 4.53

Optic dielectric constant: 2.19 or 2.20

 

Electron mobility:

Hole mobility:

Polaron coupling constant:

a = 4.14 ( for m*=1 )

a = 3.78 or 3.99 (Hodby)

 

Effective mass:

conduction band: 0.515 (band mass), also 0.435 or 0.485 (Hodby)

Polaron mass: 1.03(±0.1)

valence band:

 

Electron affinity: ( in eV., from bottom of conduction band under vacuum)

0.50(±0.05) (Ref.3)

0.51(±0.05) (Ref.4)

3.72 (estimation of Mott & Gurney, Ref.5)

 

Spin-orbit coupling: 0.13 ( valence band) (Ref.6)

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References:

 

  1. M. Ghafelehbashi, D. Dankedar & A.L. Ruoff, Pressure & temperature dependence of the elastic constants of RbCl, RbBr & RbI, J. Appl. Phys 41, 652 (1970)

    2.  

  2. W.B. Fowler, "Physics of Color Centers", New York: Academic Press (1968)

    3.  

  3. Y. Iguchi, T. Sasaki & H. Sugawara, Photoelectric emission of RbCl in the Extreme Ultraviolet, Phys. Rev. Letters 26, n.2, 82 (1971)

    4.  

  4. T. Sasaki, Y. Iguchi & H. Sugawara, Photoelectric emission of Potassium halides in the extreme ultraviolet, J. Phys. Soc. Jap. 30, 580 (1971)

    5.  

  5. N.F. Mott & R.W. Gurney, "Electronic processes in Ionic crystals"

    6.  

  6. J.E. Eby, K.J. Teegarden & D.B. Dutton, Ultraviolet absorption of alkali halides, Phys.Rev. 116, 1099 (1959)

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