Inelastic neutron scattering, susceptibility, and high-field magnetization identify LiCuVO4 as a nearest-neighbour ferromagnetic, next-nearest-neighbour frustrated, quasi-onedimensional helimagnet, which is largely influenced by quantum fluctuations. Complementary band structure calculations provide a microscopic model with the correct sign and magnitude of the major exchange integrals.
Master plot methods based on the integral and/or the differential forms of the kinetic equation describing
solid-state reactions have been redefined by using the concept of the generalized time, θ, introduced by Ozawa.
This redefinition permits the application of these master plots to the kinetic analysis of solid-state reactions,
whatever the type of temperature program used for recording the experimental data. In isothermal conditions,
a single curve is enough to construct the experimental master plots. In nonisothermal conditions, the knowledge
of both α as a function of temperature and activation energy is required for calculating the master plot curves
from the experimental data. Practical usefulness of the present master plot methods is examined, and exemplified
by being applied to the thermal decomposition of ZnCO3 under isothermal, linear nonisothermal, and nonlinear
nonisothermal conditions.
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