4.1 Author:
   Burkert, Paul K.
Reference:
   Journal, ZNBAD2, Z.Naturforsch.B Anorg.Chem.Org.Chem., GE, 35, 11, 1980, 1349-1354
Title:
   Spectroscopic Investigations in the Solid State Chemistry, XIII Temperature Dependence of the 127I-Nuclear Quadrupole Coupling in NH4IO4 and other Periodates
Abstract:
The temperature dependence of the electric field gradients was measured by I. and II. order quadrupole effects of the 127I NMR signals in scheelite-structured NH4IO4 and RbIO4, in pseudo-scheelite CsIO4 and in N(CH3)4IO4, where rcation > ranion.An interpretation of the anomalous positive temperature dependences of the quadrupole coupling constants in NH4IO4 and in the isostructural NH4ReO4 is proposed.