Differential Thermal Gas Analysis (DTGA) is a high-sensitivity measuring method of gas evolution from, and gas absorption by a solid sample in a reactor gas stream, with arbitrary mixing ratio of active gas and inert gas by programmed temperature changes. DTGA is expected to be of very wide application as much as differential thermal analysis, thermogravimetry and high temperature X-ray diffractometry in crystallography, physical chemistry, inorganic chemistry, organic chemistry and metallurgy. The typical applications of DTGA are given, e. g. phase transition of SrMnO3-x with absorption and evolution of oxygen.
Applications of the holography to the X-ray region are described. Two types of the image-reconstructing process are attempted. In-line holograms of line-like objects of chemical fibers and point-like objects of red blood cells are made by using Al Kα radiation (8.34Å) from a two-stage fine focus X-ray generator. Magnified real images are reconstructed from the negative holograms using a He-Ne laser (6328Å) . A resolution of about 4 μm is obtained in this imaging process. On the other hand, a lensless Fourier-transform hologram of a model object like a row of slits is made by using an electron synchrotron radiation (60Å) . A magnified real image is reconstructed by a Fourier-transform method, where a magnification factor of 158 is obtained. Several factors limiting the image resolution are discussed.
Recent progresses of the X-ray and neutron studies of the phase transitions of TTF-TCNQ are described. The observed Kohn anomaly in the metallic phase and superstructure below the metal-insulator transition temperature (54K) indicate that the transition is the Peierls one. Further, it is shown that TTF-TCNQ has another phase transition of the superstructure at 38K.