ISSN:
1432-2021
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Geologie und Paläontologie
,
Physik
Notizen:
Abstract The dielectric constants and dissipation factors of topaz, scapolite and orthoclase were determined at 1 MHz using a two-terminal method and empirically determined edge corrections. The results are: topaz κ′ a =6.61 tan δ=0.0005 κ′ b =6.82 tan δ=0.0007 κ′ c =6.81 tan δ=0.0007 orthoclase κ′ a =4.69 tan δ=0.0007 κ′ b =5.79 tan δ=0.0007 κ′ c =5.63 tan δ=0.0011 κ′ 11 =4.72 κ′ 22 =5.79 κ′ 33 =5.76 scapolite κ′ a =6.74 tan δ=0.0004 κ′ c =8.51 tan δ=0.0004 The deviation (Δ) between measured dielectric polarizabilities as determined from the Clausius-Mosotti equation and those calculated from the sum of ion polarizabilities according to α D (mineral)=∑αD (ions) for topaz is 2.5%. The large deviations of orthoclase and scapolite from the oxide additivity rule with δ=+7.2 and + 17.6%, respectively, are attributed to “rattling” K ions in orthoclase and “rattling” (Na,K,Ca) ions and disordered O= and Cl- ions in scapolite.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00202104
