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

doi:10.15541/jim20190404

Abstract

Abstract:

Si₃N₄-ZrO₂-La₂O₃ ternary system were prepared via solid-state reaction at 1500 ℃ for 1 h with N₂ protection, yielding coexistence phase of ZrN and lanthanum-based compounds, such as La_4.67Si₃O₁₃, La₅Si₃NO₁₂, La₄Si₂N₂O₇, LaSiNO₂, and La₂Zr₂O₇. Since the generated ZrN and lanthanum-based compounds are not located on the triangle plane of Si₃N₄-ZrO₂-La₂O₃ system, it is necessary to add SiO₂ to extend the ternary into quinary system of Si₃N₄-SiO₂-La₂O₃-ZrO₂-ZrN. After the phase diagram of this quinary system is confirmed and presented, the phase diagram of La₂O₃-SiO₂-ZrO₂ ternary subsystem at 1570 ℃ is further proposed for the first time. In addition, La₂O₃ in the Si₃N₄-ZrO₂-La₂O₃ ternary system can help to simulate the substitution reaction between Si₃N₄ and ZrO₂ to produce ZrN.

Key words: zirconium nitride, phase relationships, solid state reaction, multiphase ceramics

CLC Number:

TQ174

LI Yanrui,LU Youjun,LIU Yang,YUAN Zhenxia,HUANG Zhenkun. Reaction Synthesizes of ZrN and Phase Diagram in the Si₃N₄-ZrO₂-La₂O₃ System[J]. Journal of Inorganic Materials, 2020, 35(7): 822-826.

Figures/Tables 9

References 20

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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)

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)

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)

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)

T/℃	ΔG/(kJ·mol^-1)	T/℃	ΔG/(kJ·mol^-1)
1400	-122.513	1600	-139.531
1500	-130.893	1700	-148.436

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

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