Perovskite-Type Oxide-Based Electrode: A New Sensor for Hydrogen-Phosphate Ion

2000 ◽  
Vol 147 (10) ◽  
pp. 3931 ◽  
Author(s):  
Youichi Shimizu ◽  
Ayatoshi Ishikawa ◽  
Kouji Iseki ◽  
Satoko Takase
Keyword(s):  
Hydrogen Phosphate ◽  
Phosphate Ion ◽  
Perovskite Type Oxide ◽  
Perovskite Type

ChemInform Abstract: Perovskite-Type Oxide-Based Electrode: A New Sensor for Hydrogen-Phosphate Ion.

ChemInform ◽  
2001 ◽  
Vol 32 (5) ◽  
pp. no-no
Author(s):  
Youichi Shimizu ◽  
Ayatoshi Ishikawa ◽  
Kouji Iseki ◽  
Satoko Takase
Keyword(s):  
Hydrogen Phosphate ◽  
Phosphate Ion ◽  
Perovskite Type Oxide ◽  
Perovskite Type

scholarly journals A Hydrogen-Phosphate Ion Sensor Using Solid Electrolyte Impedance Transducer and Perovskite-Type Oxide Receptor

2006 ◽  
Vol 74 (2) ◽  
pp. 163-165
Author(s):  
Mariko YOSHIDA ◽  
Norahim B. IBRAHIM ◽  
Yang L. AUNG ◽  
Satoko TAKASE ◽  
Youichi SHIMIZU
Keyword(s):  
Solid Electrolyte ◽  
Hydrogen Phosphate ◽  
Ion Sensor ◽  
Phosphate Ion ◽  
Perovskite Type Oxide ◽  
Perovskite Type

Preparation of Perovskite-Type Oxide Thick-Film Device by EPD Method and its Application for Electrochemical Hydrogen-Phosphate Ion Sensor

2012 ◽  
Vol 507 ◽  
pp. 215-219
Author(s):  
Toru Inagaki ◽  
Toshikazu Matsumoto ◽  
Satoko Takase ◽  
Youichi Shimizu
Keyword(s):  
Steady State ◽  
Thick Film ◽  
Fine Powder ◽  
Hydrogen Phosphate ◽  
Film Sensor ◽  
Fine Powders ◽  
Phosphate Ion ◽  
Polymer Precursors ◽  
Perovskite Type Oxide ◽  
Perovskite Type

Perovskite-type oxide (LaCoO3) fine powders were prepared by a polymer precursors (PP) methods at 300~500°C. The LaCoO3 fine powder could be prepared at 380°C when the use of EDA and PEG for organic-and polymer-additives, respectively. The surface area of LCO was ca. 39m2/g. LCO thick-film could be prepared from the steady state suspension with the addition of AcAc or PVAby the EPD method at +10V, 3min.The current density of the LaCoO3 film sensor was changed with changing HPO42- concentration at +1.00 V vs. SCE. The device showed relatively good amperometoric response to H2PO4- from 1.0x10-5M to 1.0x10-3M with the 90% response time of ca 2min. The LaCoO3-based sensor also showed a good selectivity among the examined anions of NO3-, Cl- and SCN-.

Electrochemical Ceramic Device for Hydrogen-Phosphate Ion Sensor

2006 ◽  
Vol 45 ◽  
pp. 1792-1798
Author(s):  
Youichi Shimizu ◽  
Satoko Takase ◽  
Mariko Yoshida
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Sol Gel ◽  
Oxide Thin Film ◽  
Hydrogen Phosphate ◽  
Oxide Thin Films ◽  
Phosphate Ion ◽  
Perovskite Type Oxide ◽  
Gel Processing ◽  
Perovskite Type

Novel sol-gel processing techniques of ceramic materials were developed for designing new functional environmental ion sensors. Wet-chemical preparation methods for metal-oxide thin-films, perovskite-type oxide thin-films, and solid-electrolyte discs could be developed by using solution techniques based on polymer precursors, etc. New electrochemical sensing techniques to hydrogen-phosphate ion with high sensitivity and selectivity were developed by the use of ceramic-based sensors. A sol-gel processing technique was developed for the preparation of La-based perovskite-type oxide thin-films using an acetylacetone (AcAc)-modified poly(vinyl alcohol) (PVA)-based polymeric precursor method. The AcAc modified PVA-based sol made it possible to deposit a thin-film as well as to lower the sintering temperatures. The La0.8Sr0.2CoO3 perovskite-type oxide thin-film electrode prepared at 500°C showed good properties of amperometric sensing to hydrogen-phosphate ion. A new solid-electrolyte ion sensor device using a Na+-ion conductor (Na5DySi4O12: NaDyCON) as an impedancemetric transducer and a perovskite-type oxide thin-film as a receptor has been further developed. The AC impedance of the device with a LaCoO3 receptor was found to vary logarithmically with increasing K2HPO4 concentration between 1.0 x 10-5 and 1.0 x 10-2 M at 10 kHz. The 90% response time was ca. 2 min at room temperature. The sensor showed a little sensitivity to NO3- at higher concentration, while no response was observed to the examined anions of Cl- and ClO4-.

First-principles Studies of Phase Stability and the Neutral Atomic Vacancies in LiNbO3, NaNbO3 and KNbO3

2005 ◽  
Vol 902 ◽  
Author(s):  
Akio Shigemi ◽  
Takahiro Wada
Keyword(s):  
Enthalpy Of Formation ◽  
Density Functional ◽  
Formation Energy ◽  
Type Structure ◽  
Enthalpies Of Formation ◽  
Functional Formalism ◽  
Reducing Atmosphere ◽  
Perovskite Type Oxide ◽  
Formation Energies ◽  
Perovskite Type

AbstractWe overall evaluated the enthalpies of formation and the formation energies of neutral vacancies in ANbO3 (A = Li, Na, K) using a plane-wave pseudopotential method within a density functional formalism. The LiNbO3 phase with the LiNbO3-type structure was confirmed to have lower enthalpy of formation than that with perovskite- or ilmenite-type structure. The NaNbO3 (R3c) and KNbO3 (Bmm2 and R3m) phases with the lowest symmetry were found to have the lowest enthalpy of formation. The formation energy of a A vacancy was found to be the lowest under an oxidizing atmosphere and that of an O vacancy was found to be the lowest under a reducing atmosphere. The formation energy of a Nb vacancy was the highest under both oxygen-rich and -poor conditions. These results are in agreement with the empirical rule that B site defects in perovskite-type oxide do not exist.

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