Bismuth calcium cobaltite thermoelectrics: A study of precursor reactivity and its influence on the phase formation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F22%3A43923923" target="_blank" >RIV/60461373:22310/22:43923923 - isvavai.cz</a>

Výsledek na webu

<a href="https://reader.elsevier.com/reader/sd/pii/S0022369722000592?token=FE92B43DE69BEE645245447EA5BCA8333E7755EF1543062C3CB3D113E7D020CF93DB36976ED4D265D4F0FBCEE3F48814&originRegion=eu-west-1&originCreation=20220606134738" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0022369722000592?token=FE92B43DE69BEE645245447EA5BCA8333E7755EF1543062C3CB3D113E7D020CF93DB36976ED4D265D4F0FBCEE3F48814&originRegion=eu-west-1&originCreation=20220606134738</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpcs.2022.110631" target="_blank" >10.1016/j.jpcs.2022.110631</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bismuth calcium cobaltite thermoelectrics: A study of precursor reactivity and its influence on the phase formation

Popis výsledku v původním jazyce

Bismuth calcium cobaltite [Bi1-xCaO2](2)[CoO2](1.7) belongs to a thermoelectric oxide family that is promising due to its high temperature and chemical stability. However, the phase equilibria within the quasiternary Bi2O3-CaO-CoOx system is not described in detail what can be problematic during the synthesis of the phase. Several quasibinary Bi-rich oxides have been described exhibiting moderate melting temperature, which can be tricky for the solid-state preparation of [Bi1-xCaO2](2)[CoO2](1.7) (moreover which melts incongruently). Therefore, it is very important to map the phase evolution in the context of the precursor used and final thermoelectric properties. Such a study has not been described in literature for [Bi1-xCaO2](2)[CoO2](1.7) yet. Two precursors were prepared using a solid state reaction and a sol-gel process and their phase evolution within 4-step calcination was observed. Then, final samples were sintered ending with either fast or slow cooling. The phase composition, microstructure and thermoelectric characteristics of the final samples are presented. The results show that the phase and microstructure evolution differs from the one published for the BiSrCoO structure analogue. The thermoelectric characteristics varied depending on the used precursors.

Název v anglickém jazyce

Bismuth calcium cobaltite thermoelectrics: A study of precursor reactivity and its influence on the phase formation

Popis výsledku anglicky

Bismuth calcium cobaltite [Bi1-xCaO2](2)[CoO2](1.7) belongs to a thermoelectric oxide family that is promising due to its high temperature and chemical stability. However, the phase equilibria within the quasiternary Bi2O3-CaO-CoOx system is not described in detail what can be problematic during the synthesis of the phase. Several quasibinary Bi-rich oxides have been described exhibiting moderate melting temperature, which can be tricky for the solid-state preparation of [Bi1-xCaO2](2)[CoO2](1.7) (moreover which melts incongruently). Therefore, it is very important to map the phase evolution in the context of the precursor used and final thermoelectric properties. Such a study has not been described in literature for [Bi1-xCaO2](2)[CoO2](1.7) yet. Two precursors were prepared using a solid state reaction and a sol-gel process and their phase evolution within 4-step calcination was observed. Then, final samples were sintered ending with either fast or slow cooling. The phase composition, microstructure and thermoelectric characteristics of the final samples are presented. The results show that the phase and microstructure evolution differs from the one published for the BiSrCoO structure analogue. The thermoelectric characteristics varied depending on the used precursors.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GA20-03253S" target="_blank" >GA20-03253S: Fázové rovnováhy, proměnlivá stechiometrie a fyzikální vlastnosti oxidů přechodných kovů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics and Chemistry of Solids

ISSN

0022-3697

e-ISSN

1879-2553

Svazek periodika

164

Číslo periodika v rámci svazku

May2022

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

110631

Kód UT WoS článku

000777830500005

EID výsledku v databázi Scopus

2-s2.0-85124605578