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The electrical conductivity behavior...

Park, Chan Young.

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The electrical conductivity behavior of perovskite metal oxides at high temperature.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The electrical conductivity behavior of perovskite metal oxides at high temperature./
Author:	Park, Chan Young.
Description:	170 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5518.
Contained By:	Dissertation Abstracts International64-11B.
Subject:	Chemistry, Inorganic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112210

The electrical conductivity behavior of perovskite metal oxides at high temperature.
Park, Chan Young.

The electrical conductivity behavior of perovskite metal oxides at high temperature. - 170 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5518.

Thesis (Ph.D.)--University of Houston, 2003.

This dissertation describes the study of the high temperature electrical conductivity behavior of perovskite metal oxides including CaCu3Ti 4O12, SrTi1-x-yInxRu y O3-delta (x = 0, 0.2, y = 0.2, 0.4), LaxSr 1-xFeO3-delta (x = 0, 0.5), and La0.2 Sr0.8Fe0.55Ti0.45 O3-delta .Subjects--Topical Terms:

517253
Chemistry, Inorganic.

The electrical conductivity behavior of perovskite metal oxides at high temperature.
LDR:04203nmm 2200289 4500 001 1865203
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008 130614s2003 eng d
035 $a (UnM)AAI3112210
035 $a AAI3112210
040 $a UnM $c UnM
100 1 $a Park, Chan Young. $3 1952661
245 1 4 $a The electrical conductivity behavior of perovskite metal oxides at high temperature.
300 $a 170 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5518.
500 $a Adviser: Allan J. Jacobson.
502 $a Thesis (Ph.D.)--University of Houston, 2003.
520 $a This dissertation describes the study of the high temperature electrical conductivity behavior of perovskite metal oxides including CaCu3Ti 4O12, SrTi1-x-yInxRu y O3-delta (x = 0, 0.2, y = 0.2, 0.4), LaxSr 1-xFeO3-delta (x = 0, 0.5), and La0.2 Sr0.8Fe0.55Ti0.45 O3-delta .
520 $a The perovskite related oxide, CaCu3Ti4O12 which is known to have a huge dielectric constant was prepared for further study of its electrical properties. The electrical conductivity measured by the DC four-probe method shows two different activation energy regions (Ea &sim; 0.67 eV and 0.1 eV) with a change in slope at &sim;330°C. According to DC and AC results, CaCu3Ti4O12 contains semiconducting grains and insulating grain boundaries. The DC and AC conductivities are consistent even though CaCu3Ti4O 12 and quenched CaCu3Ti4O12 have different dielectric constants (&sim;20,000 and &sim;30,000, respectively). Dielectric constants were significantly dependent on the density of the sample. The average grain boundary thickness of CaCu3Ti4O12 and quenched CaCu3Ti4O12 obtained by Transmission Electron Microscopy (TEM) were 1.5 nm and 12 nm, respectively.
520 $a The perovskite oxides, SrTi0.8Ru0.2O3-delta , SrTi0.6Ru0.4O3-delta, and SrTi0.6In0.2Ru0.2O3-delta were prepared by solid-state synthesis. The electrical conductivity of SrTi 0.6In0.2Ru0.2O3-delta shows a discontinuity at &sim;300°C at low oxygen partial pressure (pO 2 &sim; 10-4 atm) due to decomposition to SrTiO 3 and ruthenium metal. The temperature and the pO2 dependences of the electrical conductivity were investigated by using DC and AC four-probe methods. SrTi0.8Ru0.2O3-delta and SrTi0.6Ru0.4O3-delta have conductivities of 6.4 Scm-1 and 5.4 Scm-1, respectively at 900°C and at pO2 = 1 atm. The conductivity of SrTi 0.6In0.2Ru0.2O3-delta at the same conditions was two orders of magnitude lower compared with SrTi 1-xRuxO3-delta. For SrTi0.6 In0.2Ru0.2O3-delta, when the pO2 was increased from 10-4 atm to 1 atm, the conductivity decreased indicating n-type conductivity. The pO2 dependence of the conductivity shows that SrTi0.6In0.2Ru 0.2O3-delta has significant ionic conductivity, sigma i &sim; 0.22 Scm-1 at 1000°C.
520 $a The electrical conductivities of SrFeO3-delta, La 0.5Sr0.5FeO3-delta, and La0.2Sr 0.8Fe0.55Ti0.45O3-delta were studied at oxygen partial pressures, &sim;10-17 ≤ pO2 ≤ 0.3 atm and at 750 ≤ T ≤ 1000°C. Slow equilibrium kinetics were observed in the intermediate pO2 region (&sim;10 -5 atm). All experimental conductivity results were obtained manually because long equilibration times were needed. The pressure dependence of the conductivity at constant temperature shows quite different behavior compared with previous reports of related compositions. The data were fit to give the electron contribution, hole contribution and ionic conductivity. The activation energies (Ea) for La0.2Sr 0.8Fe0.55Ti0.45O3-delta were 0.63 eV and 2.40 eV for the ionic conductivity and the electron contribution to the conductivity, respectively. Oxygen non-stoichiometry (delta) as a function of pO2 was determined by solid-state coulometric titration for La0.2Sr0.8Fe0.55Ti0.45O 3-delta. Based on the plot of log pO2 vs. delta, a point defect model is suggested and the partial molar quantities for oxidation were calculated.
590 $a School code: 0087.
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0488
710 2 0 $a University of Houston. $3 1019266
773 0 $t Dissertation Abstracts International $g 64-11B.
790 1 0 $a Jacobson, Allan J., $e advisor
790 $a 0087
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112210