Single crystal plates, preparation

In this study, similar composite lilms of 100 nm thick were prepared on KCl single crystal plates, and Ihese plates were dissolved in water prior to the transmission electron microscopic (TEM), JEM 100-C, JEOL oberservation. Optical absorption spectra of the composite films and those dissolved in m-cresol solutiorks were measured in the wavelength range between 300 and 900 nm by means of... 

Measurements have been carried out on small single crystals (plates with sizes 0.5 X 0.5 mm). Some difficulties have arisen. First, many of the single crystals that have been prepared are imperfect. Second, the classical, precise methods for k measurements were developed for large samples. Thus, it has been necessary to develop a new technique, but significant errors are associated with it. 

Fig. 8. Apparatus for the preparation of single crystals by the Van Arkel procedure i. quartz ampoule 2. tube with iodine 3. feed material 4. RF heated W sphere or plate 5. resistance furnace 6. RF coil...

Ceramics as dielectrics for capacitors have the disadvantage that they are not easily prepared as self-supporting thin plates and, if this is achieved, are extremely fragile. However, mica (a single-crystal mineral silicate) has been... 

Single crystal studies of solid hydrates are scarce. There are two experimental procedures possible (i) transmission spectra of thin crystal plates (see, for example. Refs. 16, 17) and (ii) reflection spectra of crystal faces . Using polarized infrared radiation, the species (symmetry) and other directional features of the water bands can be determined. In the case of reflection measurements, the true transverse and longitudinal optic phonon frequencies can be additionally computed by means of Kramers-Kronig analyses and oscillator fit methods, respectively. Both experimental techniques, however, are relatively difficult because of the lack of suitable monocrystals, the requirement of preparing sufficiently thin, i.e., <0.1 mm, crystal plates (except for studying overtone bands, see Sect. 4.2.6), and the efflorescence or absorption of water at the crystal surfaces. In favorable cases, thin sheets of orientated powdery material can be obtained . ... 

Single crystal p-Si(lOO) wafers [CZ, 1.37 - 1.7 I2cm, Shin-Etsu Handotai Co., Ltd.] were used. Ohmic contact was made with In-Ga-Zn alloy. Metal (Cu) particles were deposited photoelectrochemically in a 0.01 M CUSO4 acidic solution. Details of the electrode preparation were described in our previous papers [2-4], Copper metal electrodes were prepared using a Cu sheet (99.994 %). They were electrochemically polished at 2.0 V vs. Cu plate counter-electrode in 85.0 % phosphoric acid for ca. 1 min. 

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