TABLE 443.— DIELECTRIC CONSTANT OF SOLIDS 



427 



75 



75 



1000 



— 600 



Wave- 

 Condi- length. 



Substance tion cm 



Asphalt 



Barium sulfate . . 



Caoutchouc 



Diamond 



Ebonite 



GlaSS Density 



Flint 



(extra heavy) . 4.5 

 Flint 



(very light).. 2.87 



Hard crown 2.48 



Mirror 



Lead (Powell) '. . 3.0-3.5 

 Jena 



Boron — 



Barium — 



Borosilicate . . — 



Gutta percha — 



Temp. 

 °C 



Ice -5 



" —18 



" -190 



Iodine (cryst.) ... 23 

 Lead chloride 



(powder) . — 



" nitrate — 



" sulfate — 



" molybdenate . — 



Marble (Carrara) . — 



Mica — 



Madras, brown . — 



" green . . — 



" ruby . . — 



Bengal, yellow . — 



" white . . — 



" ruby . . — 



Canadian amber. — 



South America . — 



Ozokerite (raw) .. — 



1200 

 5000 



75 

 75 



Dielectric 

 constant 



2.68 

 10.2 



2.22 

 16.5 



5.50 



2.72 



2.86 



2.55 



9.90 



6.61 



6.96 



6.44-7.46 



5.37-5.90 



5.42-6.20 



5.4-8.0 



5.5-8.1 

 7.8-8.5 

 6.4-7.7 

 3.3-4.9 



2.85 



3.16 



1.76-1.88 



4.00 



42 

 16 

 28 

 24 



8 3 



5.66-5.97 



5.80-6.62 



2.5-3.4 



3.9-5.5 



4.4 



2.8 



4.2 

 4.2-4.7 



3.0 



5.9 



2.21 



Substance 



Condi- 

 tion 



Temp. 

 °C 



Wave- 

 length, 

 cm 



Phosphorus : 



Yellow 



Solid 



Liquid 



Porcelain : 



Hard 



(Royal B'l'n) 



Seger " " 



Figure " " 

 Selenium 



Shellac 



61 

 61 



75 

 80 

 80 



75 



00 



1000 



Amber 



Sulfur 

 Amorphous 



Cast, fresh 

 Cast, old . . 



- 75 



f near ] 



Liquid < melting- > 



I. point J 

 Strontium sulfate . — 

 Thallium carbonate — 

 nitrate . . — 

 Wood 



Red beech || fibers 



1 " 



Oak || " 



" 1 " 



Dielectric 

 constant 



2.0 

 2.0-2.5 

 2.46 

 2.32 

 2.10 

 2.14 

 2.16 

 2.16 

 2.25 



75 



00 



75 



75 

 75 

 75 

 dried 



3.60 

 4.1 



3.85 



5.73 

 6.61 

 6.84 

 7.44 

 6.60 

 6.13 

 6.14 

 3.10 

 2.95-3.73 

 3.67 

 2.86 



3.98 

 3.80 

 4.22 

 4.05 

 3.95 

 3.60 

 3.90 



3.42 



11.3 



17 



16.5 



' 4.83-2.51 

 7.73-3.63 

 4.22-2.46 

 6.84-3.64 



TABLE 444.— ELECTROSTRICTION * 



Electrostriction is a change in the dimensions of a dielectric proportional to the square 

 of an applied electric field. The effect is very small except for bodies of very high dielec- 

 tric constant or high mechanical compliance."' c 



Typical values for — 



Glasses 



0.1 to 0.7X10" 

 transverse 



Rubber 



7 X 10"° 



longitudinal 



Barium titanate 

 polycrystalline 



100 X 10- 9 cm 2 /statvolt 

 longitudinal 



Prepared by Hans Jarre, Brush Development Co., Cleveland, Ohi 

 ■ ° Letters refer to references, p. 431. 



SMITHSONIAN PHYSICAL TABLES 



