Paramagnetic resonance study of the phase change in sodium azide

✍ Scribed by F.J. Owens

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 494 KB
• Volume: 35
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(75)85329-2

✦ Synopsis

The EPR ofthe 6S 5,3 ground state of vacvlcy compensate3 divaleut manganese is used as -2 probe to study the detailed charges that occur when the crystal changes phase from a rhombohedral to monoclinic unit cell at 19°C. Within the kl"C temperature control the zero-field splitting vties near Tc 2s (Tc-T)"' consistent with mean field theory and Rarmxn meawreztents of the soft mode. A marked reduction of the intensity of the resonances is observed near Tc as the temperature approaches Tc from above or below. No broadening or change of c&ape of the resonaxes is observed to be correlated with this intensity reduction. Power saturation studies of the spectrum at different temperatures near Tc suggest that the reduction in line intendty may be due to 1 len~~ech7g of the spin-izttice retition time.