Barium titanate ceramic 

 K=1700 



TABLE 451.— PIEZOELECTRICITY (concluded) 



Polarized polycrystalline substance 



+570 



750 



dn 



-235 



433 



Authority 



e 



TABLE 452.— VALUES FOR POWER FACTOR IN PERCENT FOR SEVERAL 

 ELECTRICAL INSULATING MATERIALS AT RADIO FREQUENCIES 



From the range of values given, an approximate figure can be taken for a particular 

 material and its relative position witli respect to other materials seen. Data of this kind 

 are much affected by the condition and past treatment of the samples and by the conditions 

 of the tests. The power factor and dielectric constant of dry air may be taken as and 1.00. 

 Fused quartz has the lowest power factor among the solid insulating materials, and is 

 used for supporting the insulated plates of standard air condensers. 



SMITHSONIAN PHYSICAL TABLES 



