Calcium stannate dielectrics compacted by spark plasma sintering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F25%3A00647878" target="_blank" >RIV/61389021:_____/25:00647878 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/25:00384463

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0921510725002260" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921510725002260</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mseb.2025.118203" target="_blank" >10.1016/j.mseb.2025.118203</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Calcium stannate dielectrics compacted by spark plasma sintering

Popis výsledku v původním jazyce

The aim of this work was to sinter calcium stannate dielectric ceramics, CaSnO3, via spark plasma sintering (SPS). The material is difficult to sinter, mainly because of Sn volatility. A semi-commercial powder product was consolidated into a form of bulk discs by SPS. As the main variable parameter, the hot-compaction pressure varied from 30 MPa to 80 MPa. The as-sintered bulks were studied by microscopy, phase analysis, X-ray photoelectron spectroscopy and microhardness. The samples were covered with electrodes and dielectric parameters were measured, including DC resistance. Relative permittivity and loss tangent values for the frequency range 1 kHz to 1 MHz and the temperature range 30 °C to 200 °C were very stable with no relaxation. Connections between the sintering parameters, microstructure and dielectric characteristics were found. Samples sintered at the pressure over 30 MPa behaved like reliable dielectrics. A novel approach to sintering of very promising dielectrics was developed: The sample sintered at 1300 °C using 50 MPa pressure exhibited very interesting values, εr = 28.2, tan(δ) = 0.036 and thermal coefficient of capacitance TCC = 26 ppm/K at 1 MHz. The influence of vacancies and ion valence modifications was discussed.

Název v anglickém jazyce

Calcium stannate dielectrics compacted by spark plasma sintering

Popis výsledku anglicky

The aim of this work was to sinter calcium stannate dielectric ceramics, CaSnO3, via spark plasma sintering (SPS). The material is difficult to sinter, mainly because of Sn volatility. A semi-commercial powder product was consolidated into a form of bulk discs by SPS. As the main variable parameter, the hot-compaction pressure varied from 30 MPa to 80 MPa. The as-sintered bulks were studied by microscopy, phase analysis, X-ray photoelectron spectroscopy and microhardness. The samples were covered with electrodes and dielectric parameters were measured, including DC resistance. Relative permittivity and loss tangent values for the frequency range 1 kHz to 1 MHz and the temperature range 30 °C to 200 °C were very stable with no relaxation. Connections between the sintering parameters, microstructure and dielectric characteristics were found. Samples sintered at the pressure over 30 MPa behaved like reliable dielectrics. A novel approach to sintering of very promising dielectrics was developed: The sample sintered at 1300 °C using 50 MPa pressure exhibited very interesting values, εr = 28.2, tan(δ) = 0.036 and thermal coefficient of capacitance TCC = 26 ppm/K at 1 MHz. The influence of vacancies and ion valence modifications was discussed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Materials Science and Engineering B-Advanced Functional Solid-State Materials

ISSN

0921-5107

e-ISSN

1873-4944

Svazek periodika

317

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

118203

Kód UT WoS článku

001443949000001

EID výsledku v databázi Scopus

2-s2.0-86000143306