Beiträge zur Ringofenmethodik. V

Zusammenfassung Nach Abtrennung von Cu(II)-Ionen mit Hilfe der Ringofentechnik ist es möglich, Ultramikromengen Kupfer(II) mit 0,001-m ÄDTA gegen PAN als Indikator zu titrieren. Eine dazu geeignete Arbeitsweise wird angegeben.

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Contributions to the ring furnace methodology. V

Summary Following separation of the Cu(II) ions with the aid of the ring furnace technique, it is possible to titrate ultramicro amounts of copper(II) with 0.001M EDTA in the presence of PAN as indicator. A suitable procedure is given.

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IV. Teil: Mikrochim. Acta [Wien]1969, 25.     

Non-conservation of quasiparticles

An adequate canonical transformation of the hamiltonian permitted the full observance of the specific Pauli commutation relations and the elimination of the main quasiparticle non-conservative term. This will allow a correct treatment of the kinematic part of the interaction in many problems.     

An analytical approach to the distribution function of electrons in the molecular oxygen discharge

Analytical expressions for the electron distribution function and the kinetic coefficients in the molecular oxygen glow discharge are given. The relative importance of the various collisional processes in evaluation of some experimentally measured quantities is discussed as well as the validity of the present results.     

Absence of the second-order phase transitions in the dimerized Ising chains with spin larger than 12

A general spin S Ising chain interacting with a single phonon mode of the harmonic lattice is studied. The thermodynamics of the spin system is calculated exactly for S = 1, $\text{1}\text{2}$ and $\text{3}\text{2}$, while self-consistent equations for the induced lattice distortions are derived. It is demonstrated that for S >$\text{1}\text{2}$ there is no second-order phase transition, in contrast to the case S = $\text{1}\text{2}$ which was proved to have a tricritical point. This is found to cohere with the previous studies of the dimerized magnetic model chains.     

Electric and electrochemical properties of solid LiH2PO4

Electrical and electrochemical properties of solid LiH₂PO₄ conductor were investigated in the temperature range from room temperature to 373 K. It was found that high conductivity throughout the temperature range, with activation energy 17.23 kJ/mol, originates from the movement of hydrogen ions (protons). The movement of protons in the correlation with phosphate groups rotation was considered. The slopes of Tafel lines and exchange current densities both for cathodic hydrogen and anodic oxygen evolution were determined (by means of usual electrochemical kinetic methods) at various temperatures. The energy of activation at the equilibrium potentials both for the cathodic and the anodic processes have been assessed to be 17.23 kJ/mol (0.18 eV) and 2.9 kJ/mol (0.03 eV), respectively.     

The thermochemical behaviour of zeolite inclusion complexes

The thermochemical behaviour of nitrate inclusion complexes of zeolites of type A was investigated and DTA curves recorded. An attempt was made to identify thermal effects. Supplementary information was obtained from the IR spectra of the solid phase before and after heating as well as from the process of denitration of inclusion complexes.