Determining the Material and Physical Properties of Alloy La₀.₈₅Ce₀.₁₅Ni₅ Used in Hydrogen Storage

The article addresses the determination of the physical and material properties of the alloy La₀.₈₅Ce₀.₁₅Ni₅ with a crystalline structure. The properties of the microstructure of the alloy were determined using a scanning electron microscope. The chemical composition was evaluated by energy-dispersive X-ray spectroscopy. An X-ray diffractometer was used to determine the phase composition of the alloy. Next, the alloy sample was subjected to measurements of hardness, thermal conductivity and heat capacity. The storage capacity of hydrogen in the alloy was determined using the pressure concentration isotherms method of measuring. For comparison, the storage capacity was also measured in the amorphous structure of the alloy formed by the melt spinning method.Установлены физические свойства сплава La₀.₈₅Ce₀.₁₅Ni₅ с кристаллической структурой. Микроструктурные свойства сплава определяли с помощью сканирующего электронного микроскопа, химический состав методом энергодисперсионной рентгеновской спектроскопии. Для определения фазового состава использовали рентгеновский дифрактометр. Проводили измерения твердости, теплопроводности и теплоемкости образца сплава. Аккумулирующую способность сплава по водороду определяли с помощью изотерм концентрации и давления. В целях сравнения аккумулирующую емкость измеряли также в аморфной структуре сплава, полученной методом формования из расплава

Measurement of hydrogen storage capacity in Ca72Mg28 alloy

This article discusses the measurement of hydrogen storage capacity in Ca72Mg28 alloy that has been produced by melt spinning. The alloy has an amorphous structure in which there is an assumption of hydrogen storage of acceptable concentration. The research is to analyse the possibility of desorption of the gas without recrystallization of the alloy. Subsequently, the problem of reversible hydrogen storage is examined at temperatures between 410–450 °C in the pressure range 0 to 3.5 MPa. This paper deals with the indirect determination of the amount of heat generated in the absorption of hydrogen by using the calorimetric method. In the conclusion there is a comparison of the storage capacity of hydrogen in the amorphous and crystalline structure of the alloy

Report from the Congress: Future of Psychiatry and Psychiatric Training – 19th European Federation of Psychiatric Trainees Forum in Prague

Article without abstract

Intense Redox-Driven Chiroptical Switching with a 580 mV Hysteresis Actuated Through Reversible Dimerization of an Azoniahelicene

Electrochemical reduction of an azoniahelicene affords a dimer, accompanied by a strong change in the electronic circular dichroism. The fast dimerisation event leads to a >500 mV shift of the oxidation potential, affording a large area of bistability, where the chiroptical signal only depends on the redox history