Reaction Synthesizes of ZrN and Phase Diagram in the Si3N4-ZrO2-La2O3 System

Yanrui LI; Youjun LU; Yang LIU; Zhenxia YUAN; Zhenkun HUANG

doi:10.15541/jim20190404

Journals >Journal of Inorganic Materials >Volume 35 >Issue 7 >Page 822 > Article

Journal of Inorganic Materials
Vol. 35, Issue 7, 822 (2020)

Reaction Synthesizes of ZrN and Phase Diagram in the Si₃N₄-ZrO₂-La₂O₃ System

Yanrui LI, Youjun LU^*, Yang LIU, Zhenxia YUAN, and Zhenkun HUANG

Author Affiliations

School of Materials Science and Engineering, North Minzu University,Yinchuan 750021,China

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DOI: 10.15541/jim20190404 Cite this Article

Yanrui LI, Youjun LU, Yang LIU, Zhenxia YUAN, Zhenkun HUANG. Reaction Synthesizes of ZrN and Phase Diagram in the Si₃N₄-ZrO₂-La₂O₃ System[J]. Journal of Inorganic Materials, 2020, 35(7): 822 Copy Citation Text

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1. XRD patterns of the samples of 0.3S′0.5Z0.2L and 0.43S′0.46Z0.11L (a), 0.2S′0.3Z0.5L and 0.5S′0.3Z0.2L (b),0.4S′0.1Z0.5L and 0.7S′0.1Z0.2L (c) sintered at 1570 ℃ for 1 h

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Phase diagram of SiO2-La2O3-ZrO2 ternary system at 1570 ℃

2. Phase diagram of SiO₂-La₂O₃-ZrO₂ ternary system at 1570 ℃

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3. XRD patterns of the samples 1S3Z3L and 2S6Z3L after sintered at 1500 ℃ for 1 h

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4. Phase diagram of Si₃N₄-ZrO₂-La₂O₃ ternary system at 1500 ℃

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5. XRD patterns of the samples (a) 3S9Z7L and 4S9Z10L, (b) 4S3Z6L and 4S3Z12L after sintered at 1500 ℃ for 1 h, and (c) 8S3Z8L after sintered at 1550 ℃ for 1 h and the samples 2S0Z3L after sintered at 1500 ℃ for 1 h

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6. Phase diagram of Si₃N₄-ZrO₂-La₂O₃-SiO₂-ZrN quinary system at 1500 ℃

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Sample	SiO₂/La₂O₃/ZrO₂	Phase composition(XRD analysis results*)
0.3S′0.5Z0.2L	0.3/0.5/0.2	La₂Zr₂O₇(s)La₂SiO₅(m)La₂O₃(w)
0.43S′0.46Z0.11L	0.43/0.46/0.11	La₂Zr₂O₇(s)La_4.67Si₃O₁₃(s)La₂SiO₅(m)
0.2S′0.3Z0.5L	0.2/0.3/0.5	La₂Zr₂O₇(vs)La_4.67Si₃O₁₃(vs)ZrO₂(w)
0.5S′0.3Z0.2L	0.5/0.3/0.2	La₂Si₂O₇(vs)La_4.67Si₃O₁₃(vs)ZrO₂(w)
0.4S′0.1Z0.5L	0.4/0.1/0.5	ZrSiO₄(vs)La₂Si₂O₇(s)ZrO₂(m)
0.7S′0.1Z0.2L	0.7/0.1/0.2	ZrSiO₄(vs)La₂Si₂O₇(m)SiO₂(w)

Table 1. Phase compositions of the SiO₂-La₂O₃-ZrO₂ system after sintered at 1570 ℃

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Sample	Si₃N₄/ZrO₂/La₂O₃	Phase composition(XRD analysis results*)
1S3Z3L	1/3/3	La₅Si₃NO₁₂(s)La₂Zr₂O₇(s)ZrN(m)
2S6Z3L	2/6/3	La_4.67Si₃O₁₃ (vs)ZrN(vs)
		ZrO₂(vw)
3S9Z7L	3/9/7	La_4.67Si₃O₁₃(vs)ZrN(m),
4S9Z10L	4/9/10	La₅Si₃NO₁₂₍vs)ZrN(m)
4S3Z6L	4/3/6	LaSiNO₂ (vs)ZrN(w)La₅Si₃NO₁₂(w)
4S3Z12L	4/3/12	La₄Si₂N₂O₇(vs)ZrN(w)La₅Si₃NO₁₂(w)
8S3Z8L(1550 ℃)	8/3/8	LaSiNO₂(vs)ZrN(w)La₂Si₆N₈O₃(w)