A Chim Lee

A Chim Lee

Seoul National University

H-index: 4

Asia-South Korea

About A Chim Lee

A Chim Lee, With an exceptional h-index of 4 and a recent h-index of 4 (since 2020), a distinguished researcher at Seoul National University, specializes in the field of Mineralogy, Fluid-mineral reaction, solid-state NMR.

His recent articles reflect a diverse array of research interests and contributions to the field:

Water-driven evolution of hydrous boron-bearing silicate melts at high pressures up to 8 GPa: Implications for dynamic properties and boron isotope content in hydrous mantle melts

Coordination Changes in Densified Aluminate Glass upon Compression up to 65 GPa: A View from Solid-State Nuclear Magnetic Resonance

Pressure-induced structural evolution in boron-bearing model rhyolitic glasses under compression: Implications for boron isotope compositions and properties of deep melts in …

Petrology and quartz grain microtextures of marine shoreline sands from the Punta Arenas area, southernmost Chile and King George Island, Antarctica and implications for their …

Pressure-load calibration of multi-anvil press at ambient temperature through structural change in cold compressed amorphous pyrope

Effect of composition on structural evolution and NMR parameters of quadrupolar nuclides in sodium borate and aluminoborosilicate glasses: a view from high-resolution 11B, 27Al …

Probing medium-range order in oxide glasses at high pressure

Configurational entropy of basaltic melts in Earth’s mantle

A Chim Lee Information

University

Seoul National University

Position

___

Citations(all)

80

Citations(since 2020)

79

Cited By

14

hIndex(all)

4

hIndex(since 2020)

4

i10Index(all)

4

i10Index(since 2020)

4

Email

University Profile Page

Seoul National University

A Chim Lee Skills & Research Interests

Mineralogy

Fluid-mineral reaction

solid-state NMR

Top articles of A Chim Lee

Water-driven evolution of hydrous boron-bearing silicate melts at high pressures up to 8 GPa: Implications for dynamic properties and boron isotope content in hydrous mantle melts

Authors

A Chim Lee,Sung Keun Lee

Journal

Geochimica et Cosmochimica Acta

Published Date

2024/2/10

A prominent seismic weakening has suggested the potential presence of H2O-bearing complex silicate melts in the Earth’s interiors. As boron is typically accompanied by the hydrous fluids and melts and may be transported into deep mantle, boron isotopic evolution enables us to trace the deep-water cycle. The impact of H2O on the structures of boron-bearing magmas is essential to grasp the melting processes and the seismic weakening in Earth’s mantle. In this study, we report experimental results on the structural changes in volatile-bearing, partially-depolymerized aluminoborosilicate glasses (NaAl0.5B0.5Si3O8) - an analog for boron-rich rhyolitic melts - with varying H2O content and at pressure conditions from 6 to 8 GPa (∼180–240 km depth in the mantle) via multi-nuclear (1H, 17O, 27Al, 11B, 29Si, and 23Na) magnetic resonance (NMR) spectroscopy. At isobaric conditions both at 6 GPa and 8 GPa …

Coordination Changes in Densified Aluminate Glass upon Compression up to 65 GPa: A View from Solid-State Nuclear Magnetic Resonance

Authors

Shujia Li,Jin Jung Kweon,Seoyoung Lee,A Chim Lee,Sung Keun Lee

Journal

The Journal of Physical Chemistry Letters

Published Date

2023/2/17

Deciphering the structural evolution in irreversibly densified oxide glasses is crucial for fabricating functional glasses with tunable properties and elucidating the nature of pressure-induced anomalous plastic deformation in glasses. High-resolution NMR spectroscopy quantifies atomic-level structural information on densified glasses; however, its application is limited to the low-pressure range due to technical challenges. Here, we report the first high-resolution NMR spectra of oxide glass compressed by diamond anvil cells at room temperature, extending the pressure record of such studies from 24 to 65 GPa. The results constrain the densification path through coordination transformation of Al cations. Based on a statistical thermodynamic model, the stepwise changes in the Al fractions of oxide glasses and the effects of network polymerization on the densification paths are quantified. These results extend the …

Pressure-induced structural evolution in boron-bearing model rhyolitic glasses under compression: Implications for boron isotope compositions and properties of deep melts in …

Authors

A Chim Lee,Eun Jeong Kim,Sung Keun Lee

Journal

Geochimica et Cosmochimica Acta

Published Date

2022/9/1

The pressure-induced structural evolutions of boron-bearing model rhyolitic melts under high pressures enable to infer the detailed geochemical processes (melting and fluid-rock-melt interactions) occurring in Earth interiors and to control the melt properties (viscosity and the boron isotope composition, δ11B) of complex magmatic melts, providing insights into the boron cycle toward the deeper part of the upper mantle (∼10 GPa). Despite the importance, the structures of multicomponent boron-bearing silicate melts above 3 GPa are currently unavailable. Here, we explore the structures, particularly, coordination transformation of constituent elements in boron-bearing nepheline and albite glasses – a model rhyolitic melts - upon compression to a depth of ∼270 km (∼9.2 GPa) in the mantle using multi-nuclear solid-state nuclear magnetic resonance (NMR) spectroscopy. The results showed that the conversion of [3 …

Petrology and quartz grain microtextures of marine shoreline sands from the Punta Arenas area, southernmost Chile and King George Island, Antarctica and implications for their …

Authors

HyeJeong Kim,A Chim Lee,Yong Il Lee,Min Kyung Lee

Journal

Episodes

Published Date

2022

Modal composition and quartz microtextures were analyzed to investigate the provenance tectonic setting and transport mechanism in shoreline sediments from the Punta Arenas (PA) area in the southernmost part of Chile and King George Island (KGI), West Antarctica. In the sediments from both areas, volcanic rock fragments were the predominant framework grain, and a significant amount of quartz was also found in the PA area. The provenance tectonic setting of the PA area was a recycled orogen, and that of the KGI area was a magmatic arc. Quartz grains exhibited subangular shape, medium to high relief, and mainly mechanical microtextures, which were induced by high shear stress (> 80%) and high-energy percussion (< 20%). The shoreline sands of the two areas did not differ significantly in the distribution of frequency of microtextures of glacial and aqueous origins, so it is interpreted that the sand sediments from both areas had similar glacial and aqueous transport histories. The percussion microstructures, which occurred in less than 20% of the sands in both areas, may be due to the relatively short residence time in the energetic aqueous conditions. The presence of weathered quartz grains fractured by glaciers indicates that they had undergone significant weathering in the preceeding warm periods. The presence of high count of pre-weathered microtextures suggests that many grains travel into glacial stream carrying the pre-weathering microfeatures, which can be recognized in the sedimentary record.

Pressure-load calibration of multi-anvil press at ambient temperature through structural change in cold compressed amorphous pyrope

Authors

Juho Lhee,Yong-Hyun Kim,A Chim Lee,Eun Jeong Kim,Seoyoung Lee,Sung Keun Lee

Journal

Korean Journal of Mineralogy and Petrology

Published Date

2022

The proper estimation of physical and chemical properties of Earth materials and their structures at high pressure and high temperature conditions is key to the full understanding of diverse geological processes in Earth and planetary interiors. Multi-anvil press-high-pressure generating device-provides unique information of Earth materials under compression, mainly relevant to Earth's upper mantle. The quantitative estimation of the relationship between the oil load within press and the actual pressure conditions within the sample needs to be established to infer the planetary processes. Such pressure-load calibration has often been based on the phase transitions of crystalline earth materials with known pressure conditions; however, unlike at high temperature conditions, phase transitions at low (or room) temperatures can be sluggish, making the calibration at such conditions challenging. In this study, we explored the changes in Al coordination environments of permanently densified pyrope glasses upon the cold compression using the high-resolution 27 Al MAS and 3QMAS NMR. The fractions of highly coordinated Al in the cold compressed pyrope glasses increase with increasing oil load and thus, the peak pressure condition. Based on known relationship between the peak pressure and the Al coordination environment in the compressed pyrope glasses at room temperature, we established a room temperature pressure-load calibration of the 14/8 HT assembly in 1,100-ton multi-anvil press. The current results highlight the first pressure-load calibration of any high pressure device using high-resolution NMR. Irreversible structural …

Effect of composition on structural evolution and NMR parameters of quadrupolar nuclides in sodium borate and aluminoborosilicate glasses: a view from high-resolution 11B, 27Al …

Authors

A Chim Lee,Sung Keun Lee

Journal

Journal of Non-Crystalline Solids

Published Date

2021/3/1

In this study, using 11B, 27Al, and 17O 3QMAS NMR spectroscopy, we investigated the compositional effect on the structures (particularly, topological evolution of boron species and their spatial proximity) and the NMR parameters of B, Al, and O configurations in binary sodium borate and sodium aluminoborosilicate glasses in NaBSiO4–NaAlSiO4 and NaBSi3O8–NaAlSi3O8 joins. Noble structural findings of the current study include the two distinct [4]B species in sodium borate glasses with low alkali content and the presence of Na–O–B peak in NaAl0.25B0.75SiO4 glasses. The proximity between [3]B and [4]B in NaAlSiO4-NaBSiO4 glasses was revealed via 11B double quantum MAS NMR. The changes in quadrupolar coupling constants and isotropic chemical shift for diverse coordination B and Al environments and oxygen clusters provide improved insights in the effect of composition on the changes in the 2 …

Probing medium-range order in oxide glasses at high pressure

Authors

Sung Keun Lee,A Chim Lee,Jin Jung Kweon

Journal

The Journal of Physical Chemistry Letters

Published Date

2021/1/27

Densification in glassy networks has traditionally been described in terms of short-range structures, such as how atoms are coordinated and how the coordination polyhedron is linked in the second coordination environment. While changes in medium-range structures beyond the second coordination shells may play an important role, experimental verification of the densification beyond short-range structures is among the remaining challenges in the physical sciences. Here, a correlation NMR experiment for prototypical borate glasses under compression up to 9 GPa offers insights into the pressure-induced evolution of proximity among cations on a medium-range scale. Whereas amorphous networks at ambient pressure may favor the formation of medium-range clusters consisting primarily of similar coordination species, such segregation between distinct coordination environments tends to decrease with …

Configurational entropy of basaltic melts in Earth’s mantle

Authors

Sung Keun Lee,Jed L. Mosenfelder,Sun Young Park,A. Chim Lee Lee,Paul D. Asimow

Journal

Proceedings of the National Academy of Sciences of the United States of America

Published Date

2020/8

Although geophysical observations of mantle regions that suggest the presence of partial melt have often been interpreted in light of the properties of basaltic liquids erupted at the surface, the seismic and rheological consequences of partial melting in the upper mantle depend instead on the properties of interstitial basaltic melt at elevated pressure. In particular, basaltic melts and glasses display anomalous mechanical softening upon compression up to several GPa, suggesting that the relevant properties of melt are strongly pressure-dependent. A full understanding of such a softening requires study, under compression, of the atomic structure of primitive small-degree basaltic melts at their formation depth, which has proven to be difficult. Here we report multiNMR spectra for a simplified basaltic glass quenched at pressures up to 5 GPa (corresponding to depths down to ∼150 km). These data allow quantification …

Network polymerization and cation coordination environments in boron-bearing rhyolitic melts: Insights from 17O, 11B, and 27Al solid-state NMR of sodium aluminoborosilicate …

Authors

A Chim Lee,Sung Keun Lee

Journal

Geochimica et Cosmochimica Acta

Published Date

2020/1/1

Despite the geochemical implications for the dissolution behaviors of nuclear waste glasses and the properties of boron-bearing rhyolitic melts, a detailed atomic-level understanding of the overall effect of boron content on the structural characteristics of boron-bearing silicate glasses remains elusive. Herein, we explore the effects of B/Al and Si/B ratios on the local configurations around cations and the degree of network polymerization of Na2O-Al2O3-B2O3-SiO2 glasses in nepheline (NaAlSiO4) – malinkoite (NaBSiO4) and albite (NaAlSi3O8) – reedmergnerite (NaBSi3O8) joins using multi-nuclear magnetic resonance (NMR). The 11B NMR results confirmed an increase in the B coordination numbers from 3 ([3]B) to 4 ([4]B) as B/Al and Si/B ratios increase. The 27Al NMR spectra show that the Al is mainly four coordinated, except in NaAl0.25B0.75SiO4 glasses, with a minor amount of [5]Al species, revealing a …

See List of Professors in A Chim Lee University(Seoul National University)

A Chim Lee FAQs

What is A Chim Lee's h-index at Seoul National University?

The h-index of A Chim Lee has been 4 since 2020 and 4 in total.

What are A Chim Lee's top articles?

The articles with the titles of

Water-driven evolution of hydrous boron-bearing silicate melts at high pressures up to 8 GPa: Implications for dynamic properties and boron isotope content in hydrous mantle melts

Coordination Changes in Densified Aluminate Glass upon Compression up to 65 GPa: A View from Solid-State Nuclear Magnetic Resonance

Pressure-induced structural evolution in boron-bearing model rhyolitic glasses under compression: Implications for boron isotope compositions and properties of deep melts in …

Petrology and quartz grain microtextures of marine shoreline sands from the Punta Arenas area, southernmost Chile and King George Island, Antarctica and implications for their …

Pressure-load calibration of multi-anvil press at ambient temperature through structural change in cold compressed amorphous pyrope

Effect of composition on structural evolution and NMR parameters of quadrupolar nuclides in sodium borate and aluminoborosilicate glasses: a view from high-resolution 11B, 27Al …

Probing medium-range order in oxide glasses at high pressure

Configurational entropy of basaltic melts in Earth’s mantle

...

are the top articles of A Chim Lee at Seoul National University.

What are A Chim Lee's research interests?

The research interests of A Chim Lee are: Mineralogy, Fluid-mineral reaction, solid-state NMR

What is A Chim Lee's total number of citations?

A Chim Lee has 80 citations in total.

What are the co-authors of A Chim Lee?

The co-authors of A Chim Lee are Sung Keun Lee, Jin Jung Kweon, Yong-Hyun Kim.

    Co-Authors

    H-index: 44
    Sung Keun Lee

    Sung Keun Lee

    Seoul National University

    H-index: 12
    Jin Jung Kweon

    Jin Jung Kweon

    Seoul National University

    H-index: 7
    Yong-Hyun Kim

    Yong-Hyun Kim

    Seoul National University

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