HfN Formation and Phase Relationships in the Hf-Si-La-O-N System

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

doi:10.15541/jim20200382

Journals >Journal of Inorganic Materials >Volume 36 >Issue 4 >Page 443 > Article

Journal of Inorganic Materials
Vol. 36, Issue 4, 443 (2021)

HfN Formation and Phase Relationships in the Hf-Si-La-O-N System

Yang LIU, Youjun LU^*, Yanrui LI, Liqun LIN, 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/jim20200382 Cite this Article

Yang LIU, Youjun LU, Yanrui LI, Liqun LIN, Zhenxia YUAN, Zhenkun HUANG. HfN Formation and Phase Relationships in the Hf-Si-La-O-N System[J]. Journal of Inorganic Materials, 2021, 36(4): 443 Copy Citation Text

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1. Change of ∆G_m of reaction (3, 4) with temperature from 1200 to 2000 ℃

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2. XRD patterns of the sample 1Si1.5Hf sintered at different temperatures

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3. XRD patterns of the samples a-f

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4. XRD patterns of the samples a′-e′

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5. Ternary phase diagram of system HfO₂-SiO₂-La₂O₃ at 1500 ℃

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6. Batching point design of HfO₂-Si₃N₄-La₂O₃system

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7. XRD patterns of the samples 1-6

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8. Three-dimensional phase diagram of Hf-Si-La-O-N quintuple system at 1500 ℃

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9. Sectional view of HfO₂-Si₃N₄-La₂O₃

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Sample	n(Si₃N₄) : n(HfO₂)	T/℃	Phase composition by XRD	Mass loss/%
1Si1.5Hf	1 : 1.5	1400	HfO₂, Hf₇O₈N₄, Si₃N₄	8.1
		1600	HfO₂, Hf₇O₈N₄, Si₃N₄, HfN	18.3
		1800	HfO₂, HfN	26.4

Table 1. Phase compositions and mass loss of the HfO₂-Si₃N₄ system

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Sample	n(HfO₂) : n(SiO₂) : n(La₂O₃)	Phase composition by XRD (1500 ℃)	Mass loss/%
a	6 : 5 : 14	La₂O₃, La₂Hf₂O₇, La₂SiO₅	1.30
b	12 : 45 : 43	La₂Hf₂O₇, La_4.67Si₃O₁₃, La₂SiO₅	1.60
c	12 : 3 : 5	HfO₂, La₂Hf₂O₇, La_4.67Si₃O₁₃	0.80
d	9 : 26 : 15	HfO₂, La₂Si₂O₇, La_4.67Si₃O₁₃	1.10
e	5 : 4 : 1	HfO₂, La₂Si₂O₇, HfSiO₄	1.90
f	15 : 73 : 12	SiO₂, La₂Si₂O₇, HfSiO₄	2.30
a′	2 : 1 : 2	La₂SiO₅, La₂Hf₂O₇	1.13
b′	2 : 3 : 3	La_4.67Si₃O₁₃, La₂Hf₂O₇	0.96
c′	5 : 3 : 2	La_4.67Si₃O₁₃, HfO₂	0.87
d′	1 : 2 : 1	La₂Si₂O₇, HfO₂	0.23
e′	1 : 3 : 1	La₂Si₂O₇, HfSiO₄	1.20

Table 2. Phase compositions of the HfO₂-SiO₂-La₂O₃ system sintered at 1500 ℃

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Sample	n(HfO₂) : n(Si₃N₄) : n(La₂O₃)	Expected product	Phase composition by XRD (1500 ℃)	Mass loss/%
1	1 : 1/3 : 1	HfN, La₂SiO₅	HfN(w), La₂Hf₂O₇(s), La₅Si₃NO₁₂(vs)	3.20
2	2 : 2/3 : 1	HfN, La₂Si₂O₇	HfN(vs), La₂Hf₂O₇(s), La_4.67Si₃O₁₃(w), Si₃N₄(vw)	2.40
3	3 : 1 : 7/3	HfN, La_4.67Si₃O₁₃	HfN(vs), La₂Hf₂O₇(s), La_4.67Si₃O₁₃(s)	4.70
4	9/4 : 1 : 5/2	HfN, La₅Si₃NO₁₂	HfN(s), La₅Si₃NO₁₂(vs), La₂Hf₂O₇(w)	4.20
5	1/4 : 1/3 : 1/2	HfN, LaSiNO₂	HfN(w), LaSiNO₂(vs)	3.70
6	1/2 : 2/3 : 2	HfN, La₄Si₂N₂O₇	HfN(w), La₅Si₃NO₁₂ (vw), La₄Si₂N₂O₇(s)	4.40

Table 3. Expected product, phase compositions and mass loss of the HfO₂-Si₃N₄-La₂O₃ system at 1500 ℃

Yang LIU, Youjun LU, Yanrui LI, Liqun LIN, Zhenxia YUAN, Zhenkun HUANG. HfN Formation and Phase Relationships in the Hf-Si-La-O-N System[J]. Journal of Inorganic Materials, 2021, 36(4): 443

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