Electric quadrupole interaction of 137Ba in barium fluorohalides

✍ Scribed by T.J. Bastow; S.N. Stuart

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 382 KB
• Volume: 6
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/0926-2040(95)01205-2

✦ Synopsis

The X-ray storage phosphor materials BaFC1 and BaFBr differ greatly in their 137Ba nuclear electric quadrupole interaction, despite a common crystal structure. The quadrupole coupling constant in BaFCl is relatively small and increases rapidly with temperature, in an unusual manner: [CQ[ = 1.7 MHz at T = 296 K, CQ-1(delta CQ/delta T)p = 1.7 x 10(-3) K-1. The coupling BaFBr is [CQ[ = 17.0 MHz at 296 K. The difference in quadrupole coupling at room temperature is explained using an electrostatic point-charge model of the crystals.