Comparative study of three yttrium organometallic compounds for the stabilization of the cubic phase in YSZ deposited by PE-CVD

L. J. Espinoza-Pérez; Eddie López-Honorato; Luis A. González; Verónica García-Montalvo

doi:10.1016/j.ceramint.2020.10.028

Comparative study of three yttrium organometallic compounds for the stabilization of the cubic phase in YSZ deposited by PE-CVD

L. J. Espinoza-Pérez, Eddie López-Honorato, Luis A. González, Verónica García-Montalvo

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Abstract

In this work, the efficiencies of three organometallic yttrium precursors used to produce YSZ coatings by plasma-enhanced chemical vapor deposition were studied. Yttrium (III) acetylacetonate, Y (acac)₃, yttrium (III) hexafluoroacetylacetonate, Y (acacF₆)₃, and yttrium (III) tris(2,2,6,6-tetramethyl-3,5-heptanedionate), Y (tmhd)₃, were used to stabilize the cubic phase in zirconia deposited at temperatures from 500 to 800 °C. Our results showed that at temperatures between 500 and 600 °C, Y (tmhd)₃ appeared to be the most efficient dopant as it introduced the highest concentration of yttria (1–2.7 mol%) with only 6.4–5.6 at.% carbon. However, at 700 and 800 °C, Y (acac)₃ introduced twice as much yttria (8–15 mol%) as Y (tmhd)₃ with almost the same amount of carbon (5.4–3 at.%). Conversely, Y (acacF₆)₃ was the least efficient as it maintained a low concentration of yttria of around 0.7–1.8 mol% with 3.6–8.2 at.% carbon for all the deposition temperatures. Among these precursors, only Y (acac)₃ surpassed 8 mol% yttria and achieved a fully stabilized cubic phase at 800 °C, with the remaining samples stabilizing only the tetragonal phase. The tetragonal phase was stabilized due to the formation of crystallites of around 10 nm. The observed difference in the efficiency of the three precursors was correlated to important differences in their decomposition behavior as observed by mass spectrometry and thermogravimetry/differential scanning calorimetry.

Original language	English
Pages (from-to)	4611-4624
Number of pages	14
Journal	Ceramics International
Volume	47
Issue number	4
DOIs	https://doi.org/10.1016/j.ceramint.2020.10.028
State	Published - Feb 15 2021

Funding

This material is based upon work supported by a grant from the Consejo Nacional de Ciencia y Tecnología (CONACYT, project number: 245629 , CONACYT-Horizon 2020) and forms part of the European project SAMOFAR (A Paradigm Shift in Reactor Safety with the Molten Salt Fast Reactor). The authors would like to acknowledge CONACYT for the Ph.D. grant awarded to L.J. Espinoza-Pérez. Authors would also like to thank María del Carmen García González for mass spectra. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This material is based upon work supported by a grant from the Consejo Nacional de Ciencia y Tecnolog?a (CONACYT, project number: 245629, CONACYT-Horizon 2020) and forms part of the European project SAMOFAR (A Paradigm Shift in Reactor Safety with the Molten Salt Fast Reactor). The authors would like to acknowledge CONACYT for the Ph.D. grant awarded to L.J. Espinoza-P?rez. Authors would also like to thank Mar?a del Carmen Garc?a Gonz?lez for mass spectra.

Funders	Funder number
CONACYT-Horizon 2020
Consejo Nacional de Ciencia y Tecnolog?a
SAMOFAR
US Department of Energy
U.S. Department of Energy
Consejo Nacional de Ciencia y Tecnología	245629

Keywords

Cubic phase
PE-CVD
Thermal behavior
YSZ
Yttrium organometallic compounds
Zirconia

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10.1016/j.ceramint.2020.10.028

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title = "Comparative study of three yttrium organometallic compounds for the stabilization of the cubic phase in YSZ deposited by PE-CVD",

abstract = "In this work, the efficiencies of three organometallic yttrium precursors used to produce YSZ coatings by plasma-enhanced chemical vapor deposition were studied. Yttrium (III) acetylacetonate, Y (acac)3, yttrium (III) hexafluoroacetylacetonate, Y (acacF6)3, and yttrium (III) tris(2,2,6,6-tetramethyl-3,5-heptanedionate), Y (tmhd)3, were used to stabilize the cubic phase in zirconia deposited at temperatures from 500 to 800 °C. Our results showed that at temperatures between 500 and 600 °C, Y (tmhd)3 appeared to be the most efficient dopant as it introduced the highest concentration of yttria (1–2.7 mol%) with only 6.4–5.6 at.% carbon. However, at 700 and 800 °C, Y (acac)3 introduced twice as much yttria (8–15 mol%) as Y (tmhd)3 with almost the same amount of carbon (5.4–3 at.%). Conversely, Y (acacF6)3 was the least efficient as it maintained a low concentration of yttria of around 0.7–1.8 mol% with 3.6–8.2 at.% carbon for all the deposition temperatures. Among these precursors, only Y (acac)3 surpassed 8 mol% yttria and achieved a fully stabilized cubic phase at 800 °C, with the remaining samples stabilizing only the tetragonal phase. The tetragonal phase was stabilized due to the formation of crystallites of around 10 nm. The observed difference in the efficiency of the three precursors was correlated to important differences in their decomposition behavior as observed by mass spectrometry and thermogravimetry/differential scanning calorimetry.",

keywords = "Cubic phase, PE-CVD, Thermal behavior, YSZ, Yttrium organometallic compounds, Zirconia",

author = "Espinoza-P{\'e}rez, {L. J.} and Eddie L{\'o}pez-Honorato and Gonz{\'a}lez, {Luis A.} and Ver{\'o}nica Garc{\'i}a-Montalvo",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd and Techna Group S.r.l.",

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doi = "10.1016/j.ceramint.2020.10.028",

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T1 - Comparative study of three yttrium organometallic compounds for the stabilization of the cubic phase in YSZ deposited by PE-CVD

AU - Espinoza-Pérez, L. J.

AU - López-Honorato, Eddie

AU - González, Luis A.

AU - García-Montalvo, Verónica

PY - 2021/2/15

Y1 - 2021/2/15

N2 - In this work, the efficiencies of three organometallic yttrium precursors used to produce YSZ coatings by plasma-enhanced chemical vapor deposition were studied. Yttrium (III) acetylacetonate, Y (acac)3, yttrium (III) hexafluoroacetylacetonate, Y (acacF6)3, and yttrium (III) tris(2,2,6,6-tetramethyl-3,5-heptanedionate), Y (tmhd)3, were used to stabilize the cubic phase in zirconia deposited at temperatures from 500 to 800 °C. Our results showed that at temperatures between 500 and 600 °C, Y (tmhd)3 appeared to be the most efficient dopant as it introduced the highest concentration of yttria (1–2.7 mol%) with only 6.4–5.6 at.% carbon. However, at 700 and 800 °C, Y (acac)3 introduced twice as much yttria (8–15 mol%) as Y (tmhd)3 with almost the same amount of carbon (5.4–3 at.%). Conversely, Y (acacF6)3 was the least efficient as it maintained a low concentration of yttria of around 0.7–1.8 mol% with 3.6–8.2 at.% carbon for all the deposition temperatures. Among these precursors, only Y (acac)3 surpassed 8 mol% yttria and achieved a fully stabilized cubic phase at 800 °C, with the remaining samples stabilizing only the tetragonal phase. The tetragonal phase was stabilized due to the formation of crystallites of around 10 nm. The observed difference in the efficiency of the three precursors was correlated to important differences in their decomposition behavior as observed by mass spectrometry and thermogravimetry/differential scanning calorimetry.

AB - In this work, the efficiencies of three organometallic yttrium precursors used to produce YSZ coatings by plasma-enhanced chemical vapor deposition were studied. Yttrium (III) acetylacetonate, Y (acac)3, yttrium (III) hexafluoroacetylacetonate, Y (acacF6)3, and yttrium (III) tris(2,2,6,6-tetramethyl-3,5-heptanedionate), Y (tmhd)3, were used to stabilize the cubic phase in zirconia deposited at temperatures from 500 to 800 °C. Our results showed that at temperatures between 500 and 600 °C, Y (tmhd)3 appeared to be the most efficient dopant as it introduced the highest concentration of yttria (1–2.7 mol%) with only 6.4–5.6 at.% carbon. However, at 700 and 800 °C, Y (acac)3 introduced twice as much yttria (8–15 mol%) as Y (tmhd)3 with almost the same amount of carbon (5.4–3 at.%). Conversely, Y (acacF6)3 was the least efficient as it maintained a low concentration of yttria of around 0.7–1.8 mol% with 3.6–8.2 at.% carbon for all the deposition temperatures. Among these precursors, only Y (acac)3 surpassed 8 mol% yttria and achieved a fully stabilized cubic phase at 800 °C, with the remaining samples stabilizing only the tetragonal phase. The tetragonal phase was stabilized due to the formation of crystallites of around 10 nm. The observed difference in the efficiency of the three precursors was correlated to important differences in their decomposition behavior as observed by mass spectrometry and thermogravimetry/differential scanning calorimetry.

KW - Cubic phase

KW - PE-CVD

KW - Thermal behavior

KW - YSZ

KW - Yttrium organometallic compounds

KW - Zirconia

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U2 - 10.1016/j.ceramint.2020.10.028

DO - 10.1016/j.ceramint.2020.10.028

M3 - Article

AN - SCOPUS:85092725252

SN - 0272-8842

VL - 47

SP - 4611

EP - 4624

JO - Ceramics International

JF - Ceramics International

IS - 4

ER -

Comparative study of three yttrium organometallic compounds for the stabilization of the cubic phase in YSZ deposited by PE-CVD

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