MELTING MECHANISMS OF IONIC SALTS: TETRA-n-AMYL AMMONIUM THIOCYANATE.

Abstract

A study is reported of the melting of ((n-amyl)4N)(+)SCN(-) (m.p. 49.5C) using dilatometry, phase-transition calorimetry, and microscopy. The changes in the electrical conductance, and in UV absorption for the fusion process are also reported. A solid-state transition occurs at 42C. Rapid cooling results in incompletely crystallized samples, with corresponding variations in the temperatures and enthalpies for the solid state transition and for fusion. The melting mechanism is examined relatively to the fusion of paraffinic hydrocarbons and ionic crystals. It is apparent that the solid-state transition (42C) may be attributed to a kink-block type transition within the amyl groups of the quarternary ammonium ion. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1969
Accession Number
AD0708817

Entities

People

  • B. Wunderlich
  • G. J. Janz
  • T. G. Coker

Organizations

  • Rensselaer Polytechnic Institute

Tags

DTIC Thesaurus Topics

  • Absorption
  • Calorimetry
  • Crystals
  • Enthalpy
  • Hydrocarbons
  • Ionic Crystals
  • Isothermal Processes
  • Microscopy
  • Phase Transformations
  • Thermodynamic Processes
  • Transition Temperature
  • Transitions

Readers

  • Materials Science and Engineering.
  • Organic Chemistry