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High Q, High Resolution Diffraction Studies of the High Temperature Phase of ...
We ask for 1 day on HRPD to study the aristotype disordered rock-salt phase of ammonium borohydride. Our goal is to determine accurate cubic harmonic parameters to determine the... -
Spectroscopic Studies of Energetic Materials
The aim of this proposal is to measure inelastic neutron spectra using the TOSCA instrument for a selection of energetic materials including some polymorphs of HMX, CL-20, and... -
Inelastic Neutron Spectroscopy Study of Ammonium Borohydride
Ammonium borohydride (ABH2) has been studied as a hydrogen storage material, it stores hydrogen on both cationic and anionic sites and has the largest gravimetric and volumetric... -
The Pressure and Temperature Dependence of the Structure of Ammonium Triiodide
We have shown that the molecular ionic solids MI3 (M=Tl, Cs, Tl, NH4) undergo structural phase transitions below 3.4 GPa at RT to give the same new high pressure phase (HP) with... -
Inelastic Neutron Scattering Experiments in the Sulfur-Ammonia Photothermoche...
The following proposal aims to ellucidate the role of ammonium ions in sulfite oxidation reaction. The key step in the sulfur-ammonia photothermochemical cycle, which is one of... -
Hydrogen-bond ordering in hexamethylenetetramine hexahydrate as a function of...
The title compound, more succinctly referred to as HMT-hydrate, is a rare example of a water-framework zeolite structure with an organic guest molecule hydrogen bonded to the... -
Quasielastic Neutron Spectroscopy of Ammonium Borohydride
We ask for 7 days on IRIS to study the quasielastic scattering in ammonium borohydride (NH4BH4). Using enriched ND4 and BD4, we aim to separate out the difference rotational and... -
High pressure behaviour of ammonium carbamate
A number of compounds crystallise in the NH3-H2O-CO2 ternary system, including ammonium carbonates and carbamates, these being closely related to the water-deficient compound... -
A high-pressure study of monovalent bifluorides
This proposal seeks PEARL beam time to conduct the first high-pressure neutron diffraction study of the monovalent azides XDF2, where X = Na, ND4, Cs and Tl. In so doing, we... -
Thermoelastic properties of ammonium sulfate, (ND4)2SO4, and the P-T dependen...
Ammonium sulfate exhibits a first-order phase transition upon cooling through ~ 224 K at room pressure, from a paraelectric to a ferroelectric crysta. There are outstanding... -
In-situ Specific Heat Measurements and Order Disorder Phase Transition Studie...
We request 4 days on HRPD to perform combined specific heat and neutron powder diffraction measurements of C60 and the molecular hydrogen storage materials, ammonia borane and... -
Thermoelastic properties of ammonium sulfate, (ND4)2SO4, and the P-T dependen...
Ammonium sulfate exhibits a first-order phase transition upon cooling through ~ 224 K at room pressure, from a paraelectric to a ferroelectric crystal. There have been no... -
The effect of pressure on the hydrogen bonding in ammonium formate
We propose to investigate the changes that occur in the structure of ammonium formate as a function of pressure. This is the simplest system in which the oxygen atoms of a... -
Local ordering in the pressure-induced order-disorder transition in ammonium ...
Ammonium bromide undergoes a pressure-induced order-disorder transition, where the disordered (plastic) phase is thought to consist of a random distribution of ammonium cations...