Dielectric losses in ammonium fluorosilicates

✍ Scribed by R. Rommetveit; I. Svare

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 171 KB
• Volume: 60
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(79)80020-2

✦ Synopsis

Cubic and -onal (NH&SiF, hare low-temperature dielectricloss maxima with activation energies Ea(cubic) = 5.4 kcal/moI and E,(trig_) = 8.7 ku!/mol not reIatcd to ionic reorientation and probably caused by OH-impurities. A number of crystals show sharp dielectric-loss maxima at low temperatures where no losses are expected from symmetric ions without dipole moments. The origin of the losses is unknown in alums [ 1,2] and most other salts, but we have shown it to be probably associated with ligand water motion in NiSiF, -6H,O 133 _ However, we have also found Ioss peaks from 150