A solid-state ion-selective electrode for determining chlordiazepoxide is described. A characteristic feature of the electrode is the presence of an intermediate conducting polymeric layer (transducer) of poly( oaminophenol) between the ion-selective membrane with ionic conduction and a Pt conductor. The properties of ion-selective electrodes with transducers are compared with those of ISEs without transducers (coated-wire electrodes, CWEs). The most important distinctive features of ion-selective electrodes with transducers are the high stability of their potentials in time and their small sizes. The main performance characteristics of the electrode and the scope of its application are found.
148Crystals with the structure of a carbonate mineral huntite are characterized by the noncentrosymmetri cal space group R32 and, thus, are promising for vari ous applications in photonics, including generation of radiation in the short wavelength spectral region [1]. A vast family of these compounds is formed in com plex borates. In particular, rare earth (RE) aluminob orates MAl 3 (BO 3 ) 4 have been studied intensively. Sin gle crystals of aluminoborates are usually grown from solution melts containing heavy elements, for exam ple, molybdenum. The absorption bands of the single crystals synthesized by this method lie in the UV spec tral region, which significantly restricts their applica tion. Phases of this structural type were also found in the family of scandium borates MSc 3 (BO 3 ) 4 , where M is a RE of the cerium group [1-6]. With increasing size of RE ions, morphotropic transitions occur; in this case, lanthanum scandium borate is characterized by centrosymmetrical modification with the monoclinic sp. gr. C2/c.In studies [3,4,6], solution melt methods for growing single crystals of RE scandium borates of the huntite type transparent in the UV region were devel oped. However, incongruent melting of crystals and the high volatility of boron oxide under high temper ature growth make it difficult to grow high quality sin gle crystals.A material promising for nonlinear optics is crystals of the solid solution with the huntite structure and the Y 0.57 La 0.72 Sc 2.71 (BO 3 ) 4 (YLSB) composition. The broad spectral transparency range (190-3700 nm) and high birefringerence (0.085) in combination with high chemical and mechanical stability makes YLSB a can didate for application in the UV spectral region. In study [7], Li 6 B 4 O 9 was used as a flux during crystalliza tion. Bulk YLSB crystals 30 × 30 × 10 mm in size were grown; the authors mentioned, however, that it was difficult to obtain high quality crystals because of the high viscosity of the solution melt. Sometimes, as is known, viscosity is reduced by introducing LiF into the melt to facilitate breaking of spatial bonds between borate groups [8].Abstract-New Y 0.57 M 0.72 Sc 2.71 (BO 3 ) 4 (M = Pr or Nd) nonlinear optical crystals of the huntite structural type with sp. gr. R32 were grown by the high temperature solution melt method. The analogous phase with cerium was prepared by solid state synthesis. Lattice parameters were established by X ray diffraction pat terns of the powder.
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