Effect of a powder compaction process on the thermoelectric properties of Bi2Sr2Co1.8Ox ceramics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F15%3A43897416" target="_blank" >RIV/60461373:22310/15:43897416 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/15:00456260

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S095522191400466X" target="_blank" >http://www.sciencedirect.com/science/article/pii/S095522191400466X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2014.08.037" target="_blank" >10.1016/j.jeurceramsoc.2014.08.037</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of a powder compaction process on the thermoelectric properties of Bi2Sr2Co1.8Ox ceramics

Popis výsledku v původním jazyce

Bi-Sr-Co-O ceramics, as members of a thermoelectric cobaltite family, do not reach the quality of thermoelectric compounds used at low temperatures. Their thermoelectric performance can be, however, boosted by the microstructure tailoring or by the variation of cobalt valence. In this work, we compare Bi2Sr2Co1.82Ox polycrystalline samples that were compacted using different procedures. The precursor powder was prepared by a chelating sol-gel method. Three compaction methods were subsequently tested: (i) cold uniaxial pressing, (ii) hot uniaxial pressing on BELT equipment and (iii) spark plasma sintering, all three followed by additional annealing in air. The thermoelectric ceramics were characterized by XRD, SEM and electric transport measurement up to 950 K. The temperature dependence of the power factor and the figure of merit were also calculated. The spark plasma sintering process yielded a material with an improved value of Seebeck coefficient - 190 ?V/K at 300 oC - the highest value reported for the polycrystalline Bi-222 material so far.

Název v anglickém jazyce

Effect of a powder compaction process on the thermoelectric properties of Bi2Sr2Co1.8Ox ceramics

Popis výsledku anglicky

Bi-Sr-Co-O ceramics, as members of a thermoelectric cobaltite family, do not reach the quality of thermoelectric compounds used at low temperatures. Their thermoelectric performance can be, however, boosted by the microstructure tailoring or by the variation of cobalt valence. In this work, we compare Bi2Sr2Co1.82Ox polycrystalline samples that were compacted using different procedures. The precursor powder was prepared by a chelating sol-gel method. Three compaction methods were subsequently tested: (i) cold uniaxial pressing, (ii) hot uniaxial pressing on BELT equipment and (iii) spark plasma sintering, all three followed by additional annealing in air. The thermoelectric ceramics were characterized by XRD, SEM and electric transport measurement up to 950 K. The temperature dependence of the power factor and the figure of merit were also calculated. The spark plasma sintering process yielded a material with an improved value of Seebeck coefficient - 190 ?V/K at 300 oC - the highest value reported for the polycrystalline Bi-222 material so far.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/GA13-17538S" target="_blank" >GA13-17538S: Oxidové termoelektrické materiály pro konverzi vysokoteplotního odpadního tepla</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of the European Ceramic Society

ISSN

0955-2219

e-ISSN

—

Svazek periodika

35

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

BE - Belgické království

Počet stran výsledku

7

Strana od-do

525-531

Kód UT WoS článku

000345201700009

EID výsledku v databázi Scopus

—