Article(id=1319726560609940012, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319726426404803327, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20250546, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1752163200000, receivedDateStr=2025-07-11, revisedDate=1753545600000, revisedDateStr=2025-07-27, acceptedDate=null, acceptedDateStr=null, onlineDate=1792576931383, onlineDateStr=2026-10-21, pubDate=1766160000000, pubDateStr=2025-12-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792576931383, onlineIssueDateStr=2026-10-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792576931383, creator=13701087609, updateTime=1792576931383, updator=13701087609, issue=Issue{id=1319726426404803327, tenantId=1146029695717560320, journalId=1263187385517883426, year='2025', volume='53', issue='12', pageStart='3433', pageEnd='3832', issueExtLink='null', onlineDate='null', pubDate='1766160000000', pubDateStr='2025-12-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792576899386, creator='13701087609', updateTime=1792577516933, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319729016953749818, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319726426404803327, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319729016953749819, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319726426404803327, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=3435, endPage=3445, ext={EN=ArticleExt(id=1319726560815460909, articleId=1319726560609940012, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=In-situ Diagnosis of Interfacial Heat Transport During Growth Process of 4-inch Lithium Niobate Crystals, columnId=1321945006265450712, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Synthesis and Application of Large-Size High-Quality Artificial Crystals—Research Article, runingTitle=null, highlight=null, articleAbstract=
Introduction

Although the Czochralski method for large-size crystal growth has been developed for over a century, the in-situ acquisition of interface states becomes a challenge due to the extreme environment of high temperature, high pressure, strong electromagnetic interference, and the coexistence of solid, liquid, and gas phases. To address the challenge of real-time monitoring of interface instability during the growth of large lithium niobate crystals, we combined the temporal evolution of key process parameters such as pulling rate, rotation rate, and power-of a 4-inch optical-grade lithium niobate crystal with the synchronous time of its growth interface's intrinsic growth interface electromotive force (GEMF). This integration enabled a full-process in-situ analysis of how growth conditions affect the growth interface. The GEMF analysis revealed pronounced interface instability phenomena, which sensitively, quantitatively, and in real time reflect temperature fluctuations at the interface and the inversion phenomena during shoulder growth, thus filling the detection blind spots left by conventional load-cell sensors and thermocouples. In this work, a correlation model between GEMF and interfacial heat and mass transfer was established, and an in-situ method was proposed to evaluate the stability of the crystal growth interface, providing a crucial theoretical foundation and an innovative technical approach for the preparation of high-quality, large-size crystals.

Methods

For the synthesis of CLN polycrystalline powder, high purity (99.99%) materials of Li2CO3 and Nb2O5 in a molar ratio of 0.946 were mixed, ground and calcined. Afterwards, the ground mixture was molten in a platinum crucible in a CZ furnace. The key process parameters such as pulling rate, rotation rate and power of 4 in optical grade lithium niobate crystal were synchronously recorded together with the intrinsic growth interface electromotive force (GEMF), thereby establishing a quantitative correlation between GEMF signals and heat-mass transport. This approach enabled in-situ detection and real-time feedback control of interface instabilities, including temperature fluctuations and interface inversion, during the shoulder growth stage. The seed temperature (Ts) and crucible temperature (Tl) were monitored by thermocouples connected to a model Eurotherm 2404 thermometer (±0.1 ℃). Platinum wires were employed as leads and electrodes, with a positive electrode affixed to the seed and a negative electrode to the base of the platinum crucible. The GEMF between the growing crystal and the melt was measured by a model Keithley 2100 micro-voltmeter (±0.1 µV).

Results and discussion

The pronounced interface fluctuations and the intense interface inversion during the shouldering stage phenomena that are difficult to detect using conventional methods can be clearly determined. The validation with extensive production data from large-size crystals demonstrates that compared with conventional detection techniques, GEMF can provide real-time and valuable information on the interface state. Furthermore, a quantitative relationship between GEMF deviation and crystal mass loss is established and a feedback strategy for regulating interface stability is proposed via integrating GEMF measurements with time-series analysis of crystal growth parameters.

Based on real-time trajectory analysis of heat and mass transfer during interface inversion, a control criterion for maintaining stable interface growth is established. During LN crystal growth, the GEMF trajectory can evolve smoothly along the reference trend represented by the Seebeck baseline, avoiding sharp deviations. When the G-Ts curve exhibits a tendency to deviate from the Seebeck baseline, it indicates that interface inversion is imminent. At this stage, reducing the rotation rate or enhancing the radial temperature gradient can suppress interface inversion and stabilize crystal growth.

Conclusions

In this study, the growth interface electromotive force (GEMF) technique was combined with the key process parameters such as pulling rate, crystal rotation rate and heating power to enable the in-situ diagnostics of the 4-inch lithium niobate (LN) crystal growth process. The results showed that the supercooling electromotive force component of the GEMF signal could accurately reflect the periodic temperature fluctuations at the crystal growth interface, which were identified as the primary cause of diameter deviations during the constant-diameter stage. Furthermore, GEMF measurements precisely captured the interface flipping phenomenon during the shouldering process. The quantitative relationships among electrical signal deviation, temperature fluctuation, and mass response were elucidated via establishing a simplified one-dimensional heat-mass transport model for the boundary layer. Local fluctuations in heat flux could induce thermal-equilibrium shifts at the interface, thereby affecting crystallization rate and mass stability. Compared with conventional monitoring methods, the proposed model enabled real-time mapping from electrical signals to the physical growth state, providing an effective technical approach for elucidating interface instability mechanisms, predicting crystallization quality deviations, and constructing closed-loop feedback control systems for the interface. This methodology could have a significant promise for the controllable growth of large-size, high-quality crystals.

, authors=Sijin LI, Jingyu YAN, Yixiao XIE, Yunzhong ZHU, authorsList=Sijin LI, Jingyu YAN, Yixiao XIE, Yunzhong ZHU, authorCompany=null, correspAuthors=Yunzhong ZHU, authorNote=

LI Sijin (2002-), female, Master candidate. E-mail:

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ZHU Yunzhong (1987-), male, Ph.D., Associate Professor. E-mail:
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提拉法大尺寸晶体生长技术发展已逾百年,但由于生长界面处于高温、强电磁干扰、固液气三相共存的极端环境,很难原位获取界面热质输运状态。针对大尺寸铌酸锂晶体生长过程中实时监测界面失稳的难题,将4英寸光学级铌酸锂晶体的提拉速度、转速、功率等关键工艺参数,与界面相本征电动势(GEMF)的同步时间序列相建立一一映射,实现了工艺流程演化对生长界面热输运影响的全过程原位解析。GEMF分析结果发现了强烈的界面失稳现象,能够灵敏、实时、定量地反映界面温度波动规律、放肩过程的界面翻转失去质量,弥补了现有称量质量传感器和热电偶的盲区。建立GEMF与界面传热传质的关联模型,提出了一种原位评估大尺寸晶体生长界面稳定性的方法,为实现高品质大尺寸晶体的可控制备提供了理论依据和新颖技术路径。

, authors=李思谨, 闫靖宇, 谢一啸, 朱允中, authorsList=李思谨, 闫靖宇, 谢一啸, 朱允中, authorCompany=null, correspAuthors=朱允中, authorNote=

李思谨(2002—),女,硕士研究生。

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朱允中(1987—),男,博士,副教授。
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原位诊断4英寸铌酸锂晶体生长工艺过程的界面热输运
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李思谨 , 闫靖宇 , 谢一啸 , 朱允中
硅酸盐学报 | 大尺寸高品质人工晶体制备与应用专题—研究论文 2025,53(12): 3435-3445
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硅酸盐学报 |大尺寸高品质人工晶体制备与应用专题—研究论文 2025 , 53 (12) : 3435 -3445
原位诊断4英寸铌酸锂晶体生长工艺过程的界面热输运
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李思谨 , 闫靖宇, 谢一啸, 朱允中
作者信息
  • 中山大学中法核工程与技术学院,广东 珠海 519082
通讯作者:
朱允中(1987—),男,博士,副教授。
作者简介:

李思谨(2002—),女,硕士研究生。

In-situ Diagnosis of Interfacial Heat Transport During Growth Process of 4-inch Lithium Niobate Crystals
Sijin LI , Jingyu YAN, Yixiao XIE, Yunzhong ZHU
Affiliations
  • Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, Guangdong, China
  • Corresponding Author:
    ZHU Yunzhong (1987-), male, Ph.D., Associate Professor. E-mail:

    LI Sijin (2002-), female, Master candidate. E-mail:

出版时间: 2025-12-20 doi: 10.14062/j.issn.0454-5648.20250546
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提拉法大尺寸晶体生长技术发展已逾百年,但由于生长界面处于高温、强电磁干扰、固液气三相共存的极端环境,很难原位获取界面热质输运状态。针对大尺寸铌酸锂晶体生长过程中实时监测界面失稳的难题,将4英寸光学级铌酸锂晶体的提拉速度、转速、功率等关键工艺参数,与界面相本征电动势(GEMF)的同步时间序列相建立一一映射,实现了工艺流程演化对生长界面热输运影响的全过程原位解析。GEMF分析结果发现了强烈的界面失稳现象,能够灵敏、实时、定量地反映界面温度波动规律、放肩过程的界面翻转失去质量,弥补了现有称量质量传感器和热电偶的盲区。建立GEMF与界面传热传质的关联模型,提出了一种原位评估大尺寸晶体生长界面稳定性的方法,为实现高品质大尺寸晶体的可控制备提供了理论依据和新颖技术路径。

铌酸锂  /  晶体生长  /  界面相本征电动势  /  原位诊断
Introduction

Although the Czochralski method for large-size crystal growth has been developed for over a century, the in-situ acquisition of interface states becomes a challenge due to the extreme environment of high temperature, high pressure, strong electromagnetic interference, and the coexistence of solid, liquid, and gas phases. To address the challenge of real-time monitoring of interface instability during the growth of large lithium niobate crystals, we combined the temporal evolution of key process parameters such as pulling rate, rotation rate, and power-of a 4-inch optical-grade lithium niobate crystal with the synchronous time of its growth interface's intrinsic growth interface electromotive force (GEMF). This integration enabled a full-process in-situ analysis of how growth conditions affect the growth interface. The GEMF analysis revealed pronounced interface instability phenomena, which sensitively, quantitatively, and in real time reflect temperature fluctuations at the interface and the inversion phenomena during shoulder growth, thus filling the detection blind spots left by conventional load-cell sensors and thermocouples. In this work, a correlation model between GEMF and interfacial heat and mass transfer was established, and an in-situ method was proposed to evaluate the stability of the crystal growth interface, providing a crucial theoretical foundation and an innovative technical approach for the preparation of high-quality, large-size crystals.

Methods

For the synthesis of CLN polycrystalline powder, high purity (99.99%) materials of Li2CO3 and Nb2O5 in a molar ratio of 0.946 were mixed, ground and calcined. Afterwards, the ground mixture was molten in a platinum crucible in a CZ furnace. The key process parameters such as pulling rate, rotation rate and power of 4 in optical grade lithium niobate crystal were synchronously recorded together with the intrinsic growth interface electromotive force (GEMF), thereby establishing a quantitative correlation between GEMF signals and heat-mass transport. This approach enabled in-situ detection and real-time feedback control of interface instabilities, including temperature fluctuations and interface inversion, during the shoulder growth stage. The seed temperature (Ts) and crucible temperature (Tl) were monitored by thermocouples connected to a model Eurotherm 2404 thermometer (±0.1 ℃). Platinum wires were employed as leads and electrodes, with a positive electrode affixed to the seed and a negative electrode to the base of the platinum crucible. The GEMF between the growing crystal and the melt was measured by a model Keithley 2100 micro-voltmeter (±0.1 µV).

Results and discussion

The pronounced interface fluctuations and the intense interface inversion during the shouldering stage phenomena that are difficult to detect using conventional methods can be clearly determined. The validation with extensive production data from large-size crystals demonstrates that compared with conventional detection techniques, GEMF can provide real-time and valuable information on the interface state. Furthermore, a quantitative relationship between GEMF deviation and crystal mass loss is established and a feedback strategy for regulating interface stability is proposed via integrating GEMF measurements with time-series analysis of crystal growth parameters.

Based on real-time trajectory analysis of heat and mass transfer during interface inversion, a control criterion for maintaining stable interface growth is established. During LN crystal growth, the GEMF trajectory can evolve smoothly along the reference trend represented by the Seebeck baseline, avoiding sharp deviations. When the G-Ts curve exhibits a tendency to deviate from the Seebeck baseline, it indicates that interface inversion is imminent. At this stage, reducing the rotation rate or enhancing the radial temperature gradient can suppress interface inversion and stabilize crystal growth.

Conclusions

In this study, the growth interface electromotive force (GEMF) technique was combined with the key process parameters such as pulling rate, crystal rotation rate and heating power to enable the in-situ diagnostics of the 4-inch lithium niobate (LN) crystal growth process. The results showed that the supercooling electromotive force component of the GEMF signal could accurately reflect the periodic temperature fluctuations at the crystal growth interface, which were identified as the primary cause of diameter deviations during the constant-diameter stage. Furthermore, GEMF measurements precisely captured the interface flipping phenomenon during the shouldering process. The quantitative relationships among electrical signal deviation, temperature fluctuation, and mass response were elucidated via establishing a simplified one-dimensional heat-mass transport model for the boundary layer. Local fluctuations in heat flux could induce thermal-equilibrium shifts at the interface, thereby affecting crystallization rate and mass stability. Compared with conventional monitoring methods, the proposed model enabled real-time mapping from electrical signals to the physical growth state, providing an effective technical approach for elucidating interface instability mechanisms, predicting crystallization quality deviations, and constructing closed-loop feedback control systems for the interface. This methodology could have a significant promise for the controllable growth of large-size, high-quality crystals.

lithium niobate  /  crystal growth  /  interface electromotive force  /  in-situ diagnostics
李思谨, 闫靖宇, 谢一啸, 朱允中. 原位诊断4英寸铌酸锂晶体生长工艺过程的界面热输运. 硅酸盐学报, 2025 , 53 (12) : 3435 -3445 . DOI: 10.14062/j.issn.0454-5648.20250546
Sijin LI, Jingyu YAN, Yixiao XIE, Yunzhong ZHU. In-situ Diagnosis of Interfacial Heat Transport During Growth Process of 4-inch Lithium Niobate Crystals[J]. Journal of the Chinese Ceramic Society, 2025 , 53 (12) : 3435 -3445 . DOI: 10.14062/j.issn.0454-5648.20250546
  • 国家自然科学基金(52372018)
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2025年第53卷第12期
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doi: 10.14062/j.issn.0454-5648.20250546
  • 接收时间:2025-07-11
  • 首发时间:2026-10-21
  • 出版时间:2025-12-20
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  • 收稿日期:2025-07-11
  • 修回日期:2025-07-27
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国家自然科学基金(52372018)
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    中山大学中法核工程与技术学院,广东 珠海 519082

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朱允中(1987—),男,博士,副教授。
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2种不同金属材料的力学参数
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species
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Percentage of
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属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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