Specific heat of nickel hexammine nitrate

✍ Scribed by Lidia Piekara-Sady

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 374 KB
• Volume: 217
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(95)00535-8

✦ Synopsis

Specific heat calculations for hexammines with halogen anions agreed well with experiment [1]. c S was calculated as a sum of individual contributions from various types of thermal excitation of a crystal. This was done by making use of the spectroscopic data available for these crystals. Larger values of the specific heat, experimentally measured, for hexammines with complex anions (NO3, CIO 3, BF~, C10£) are expected to come from an additional number of degrees of freedom of the complex anion. An attempt has been made to calculate specific heat versus temperature for nickel hexammine nitrate. The upper limit of v = 140 cm-1, the frequency of the NO~ local mode active exclusively in the high-temperature phase I above T¢1 = 243 K, was concluded.