Mass spectrometric study of the molecular and ionic sublimation of lanthanum tribromide
- 1. Ivanovskij Gosudarstvennyj Khimiko-Tekhnologicheskij Univ., Ivanovo (Russian Federation)
- 2. Bernskij Univ., Bern (Swaziland)
Description
The molecular and ionic composition of vapor over lanthanum tribromide was studied by high-temperature mass spectrometry under the conditions of sublimation from a Knudsen effusion cell and from an open single crystal surface. The partial pressures of LaBr3 and La2Br6 in saturated vapor and the ratio between their sublimation coefficients under free vaporization conditions were determined. The second and third laws of thermodynamics were used to calculate the enthalpies of sublimation of LaBr3 in the form of monomers and dimers. In ionic sublimation studies, the emission of the Br-, LaBr4- and La2Br7- negative ions was recorded in both regimes. Studies of the ionic sublimation of LnX3 single crystals were shown to give reliable data on the thermochemical properties of negative ions
Abstract (Russian)
Методом высокотемпературной масс-спектрометрии изучен молекулярный и ионный состав пара над трибромидом лантана в условиях сублимации из эффузионной камеры Кнудсена и с открытой поверхности монокристалла. Определены парциальные давления молекул LaBr3 и La2Br6 в насыщенном паре и соотношение их коэффициентов сублимации в условиях свободного испарения. С использованием II и III законов термодинамики рассчитаны энтальпии сублимации LaBr3 в виде мономеров и димеров. При исследовании ионной сублимации в обоих режимах зарегистрирована эмиссия отрицательных ионов Br-, LaBr4- и La2Br7-. Показано, что изучение ионной сублимации монокристаллов LnX3 позволяет получать надежные данные о термохимических свойствах отрицательных ионовAdditional details
Additional titles
- Original title (Russian)
- Масс-спектрометрическое исследование молекулярной и ионной сублимации трибромида лантана
Publishing Information
- Journal Title
- Zhurnal Fizicheskoj Khimii
- Journal Volume
- 82
- Journal Issue
- 2
- Journal Page Range
- p. 227-235
- ISSN
- 0044-4537
- CODEN
- ZFKHA9
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- Russian Federation
- INIS RN
- 39097402
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANIONS; CHEMICAL COMPOSITION; DIMERS; EXPERIMENTAL DATA; LANTHANUM BROMIDES; MASS SPECTROSCOPY; MOLECULES; MONOCRYSTALS; MONOMERS; PARTIAL PRESSURE; SUBLIMATION; SUBLIMATION HEAT; VAPORS
- Descriptors DEC
- BROMIDES; BROMINE COMPOUNDS; CHARGED PARTICLES; CRYSTALS; DATA; ENTHALPY; EVAPORATION; FLUIDS; GASES; HALIDES; HALOGEN COMPOUNDS; INFORMATION; IONS; LANTHANUM COMPOUNDS; NUMERICAL DATA; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SPECTROSCOPY; THERMODYNAMIC PROPERTIES; TRANSITION HEAT
Optional Information
- Notes
- 36 refs., 4 figs., 5 tabs.