INFICON RQCM - Quartz Crystal Microbalance Research System - Manual (Page 56)

RQCM – RESEARCH QUARTZ CRYSTAL MICROBALANCE
THEORY OF OPERATION 5-4
Table 5-1 Material Density and Acoustic Impedance Value
Material Symbol Density
gm/cm^2
Impedance
10^5gm/(cm^2sec)
Aluminum Al 2.70 8.17
Aluminum Oxide Al
2
O
3
3.97 26.28
Antimony Sb 6.62 11.49
Arsenic As 5.73 9.14
Barium Ba 3.5 4.20
Beryllium Be 1.85 16.26
Bismuth Bi 9.8 11.18
Boron B 2.54 22.70
Cadmium Cd 8.64 12.95
Cadmium Sulfide CdS 4.83 8.66
Cadmium Telluride CdTe 5.85 9.01
Calcium Ca 1.55 3.37
Calcium Fluoride CaF
2
3.18 11.39
Carbon (Diamond) C 3.52 40.14
Carbon (Graphite) C 2.25 2.71
Chromium Cr 7.20 28.95
Cobalt Co 8.71 25.74
Copper Cu 8.93 20.21
Copper (I) Sulfide (alpha) Cu
2
S 5.6 12.80
Copper (I) Sulfide (beta) Cu
2
S 5.8 13.18
Copper (II) Sulfide CuS 4.6 10.77
Dysprosium Dy 8.54 14.72
Erbium Er 9.05 11.93
Europium Eu 5.244 ----
Gadolinium Gd 7.89 13.18
Gallium Ga 5.93 14.89
Gallium Arsenide GaAs 5.31 5.55
Germanium Ge 5.35 17.11
Gold Au 19.30 23.18
Hafnium Hf 13.09 24.53
Holnium Ho 8.8 15.2
Indium In 7.30 10.50
Indium Antimonide InSb 5.76 11.48
Iridium Ir 22.40 68.45
Iron Fe 7.86 25.30
Lanthanum La 6.17 9.59
Lead Pb 11.30 7.81
Lead Sulfide PbS 7.50 15.60
Lithium Li 0.53 1.50
Lithium Fluoride LiF 2.64 11.41
Magnesium Mg 1.74 5.48
Magnesium Fluoride MgF
2
3.0 13.86
Magnesium Oxide MgO 3.58 21.48
Manganese Mn 7.20 23.42
Manganese (II) Sulfide MnS 3.99 9.39
Mercury Hg 13.46 11.93
Molybdenum Mo 10.20 34.36
Nickel Ni 8.91 26.68
Niobium Nb 8.57 17.91