Hydrates of barium hydroxide. Preparation, thermal decomposition and X-ray data

Micro-scale deformation of gypsum during micro-indentation loading

“…Phase transformations through, for example, dehydration are important in efficiently processing minerals [70,71]. Thermo-Raman analysis by Chang et al [1] showed that the dehydration of gypsum (CaSO 4 Á 2H 2 O) is a two step consecutive reaction into anhydrite (a-CaSO 4 Raman measurements as a result of dehydration.…”

Diffuse Reflection Infrared Fourier Transform (DRIFT) Spectra and High-Temperature DRIFT Spectra of β—Ni(IO3)2·4H2O, Ni(IO3)2·2H2O, Mg(OH)2, and Zn(OH)F: Novel Embedding Materials

“…High-temperature DRIFT spectra would be a complementary technique to high-temperature Raman spectroscopy. 7,[11][12][13][14][15] In the case of conventional infrared transm ission spectra using paraf n mulls and KBr discs, etc., high-temperature experiments 16,17 are strongly limited by the low-tem perature-only stability of these matrices. Also, KBr discs become opaque during heating of a hydrate because of the loss of water of crystallization, and transm ission spectroscopy fails in the case of opaque matrices.…”

Corrosion of YBCO bulk superconductor in air

“…Observed water release may be related to the dehydration of barium hydroxide hydrates. The release of water at higher temperatures reported in may be caused by slower kinetic of dehydration from inner parts of the sample. Besides water, also release of oxygen was observed.…”

“…8 H 2 O (dehydration temperature 90‐130°C), Ba(OH) 2 . 3 H 2 O (dehydration temperature 130‐150°C), β Ba(OH) 2 .1 H 2 O (dehydration temperature 150‐155°C) and γ Ba(OH) 2 .1 H 2 O (dehydration temperature 230‐250°C) . We may expect presence of CuO, Y 2 BaCuO 5 and barium hydroxide hydrate on the degraded crack surfaces with the volume ratios close to 3: 12: 4 when density of CuO (6.4 g/cm 3 ), Y 2 BaCuO 5 (6.4 g/cm 3 ), and 5 Ba(OH) 2 .…”