Bertil Sundqvist

Research qualifications: Docent

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Affiliated as professor emeritus at Department of Physics

Fysikhuset, plan 1, Linnaeus väg 24, 4-0500 Umeå universitet, 901 87 Umeå

Significant electron-phonon coupling in nanographene confined in single-walled carbon nanotubes due to the large amplitude of radial breathinglike vibrations

Physical Review B, American Physical Society 2024, Vol. 109, (19)

Wu, Bingze; Zhu, Mingfeng; Zhai, Chunguang; et al.

Enhancement of short/medium-range order and thermal conductivity in ultrahard sp³ amorphous carbon by C₇₀ precursor

Nature Communications, Springer Nature 2023, Vol. 14, (1)

Shang, Yuchen; Yao, Mingguang; Liu, Zhaodong; et al.

Doping of charge-transfer molecules in cocrystals for the design of materials with novel piezo-activated luminescence

Chemical Science, Royal Society of Chemistry 2023, Vol. 14, (6) : 1479-1484

Yin, Xiu; Zhai, Chunguang; Hu, Shuhe; et al.

Resistivity saturation in crystalline metals: Semi-classical theory versus experiment

Journal of Physics and Chemistry of Solids, Elsevier 2022, Vol. 165

Sundqvist, Bertil

High pressure and high temperature induced polymerization of C60 solvates: The effect of intercalated aromatic solvents

The Journal of Physical Chemistry C, American Chemical Society (ACS) 2021, Vol. 125, (31) : 17155-17163

Du, Mingrun; Dong, Jiajun; Zhang, Ying; et al.

Ultrahard bulk amorphous carbon from collapsed fullerene

Nature, Nature Publishing Group 2021, Vol. 599, (7886) : 599-604

Shang, Yuchen; Liu, Zhaodong; Dong, Jiajun; et al.

Carbon under pressure

Physics reports, Elsevier 2021, Vol. 909 : 1-73

Sundqvist, Bertil

Correlation between weak localization effects and resistivity saturation in dilute Ti-Al alloys

Physics Letters A, Elsevier 2021, Vol. 400

Sundqvist, Bertil

Anomalous phonon softening of G-band in compressed graphitic carbon nitride due to strong electrostatic repulsion

Applied Physics Letters, American Institute of Physics (AIP) 2021, Vol. 118, (2)

Yang, Zhenxing; Mahmood, Javeed; Niu, Shifeng; et al.

Molecular insertion regulates the donor-acceptor interactions in cocrystals for the design of piezochromic luminescent materials

Nature Communications, Nature Publishing Group 2021, Vol. 12, (1)

Zhai, Chunguang; Yin, Xiu; Niu, Shifeng; et al.

Decompression-Induced Diamond Formation from Graphite Sheared under Pressure

Physical Review Letters, American Physical Society 2020, Vol. 124, (6)

Dong, Jiajun; Yao, Zhen; Yao, Mingguang; et al.

Negative Volume Compressibility in Sc3N@C-80-Cubane Cocrystal with Charge Transfer

Journal of the American Chemical Society, American Chemical Society (ACS) 2020, Vol. 142, (16) : 7584-7590

Zhang, Ying; Yao, Mingguang; Du, Mingrun; et al.

High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility

National Science Review, Oxford University Press 2019, Vol. 6, (4) : 713-718

Huang, Xiaoli; Wang, Xin; Duan, Defang; et al.

New ordered structure of amorphous carbon clusters induced by fullerene-cubane reactions

Advanced Materials, Wiley-VCH Verlagsgesellschaft 2018, Vol. 30

Du, Mingrun; Yao, Mingguang; Dong, JiaJun; et al.

Instability and thermal conductivity of pressure-densified and elastically altered orientational glass of Buckminsterfullerene

Journal of Chemical Physics, American Institute of Physics (AIP) 2018, Vol. 148, (14)

Johari, G. P.; Andersson, Ove; Sundqvist, Bertil

Saturation and pressure effects on the resistivity of titanium and two Ti-Al alloys

Journal of Physics and Chemistry of Solids, Elsevier 2018, Vol. 122 : 41-50

Sundqvist, Bertil; Tolpygo, Vladimir Kirillovich

Tuning the band gap and the nitrogen content in carbon nitride materials by high temperature treatment at high pressure

Carbon, Elsevier 2018, Vol. 130 : 170-177

Yang, Zhenxing; Hu, Kuo; Meng, Xianwei; et al.

Pressure induced metastable polymerization in doped C₆₀ materials

Carbon, Elsevier 2017, Vol. 115 : 740-745

Cui, Wen; Sun, Shishuai; Sundqvist, Bertil; et al.

High pressure infrared spectroscopy study on C60*CS2 solvates

Chemical Physics Letters, Elsevier 2017, Vol. 669 : 49-53

Du, Mingrun; Zhou, Miao; Yao, Mingguang; et al.

Quasi 3D polymerization in C₆₀ bilayers in a fullerene solvate

Carbon, Elsevier 2017, Vol. 124 : 499-505

Pei, Cuiying; Feng, Meina; Yang, Zhenxing; et al.

Raman identification of C₇₀ monomers and dimers

Diamond and related materials, Elsevier 2017, Vol. 73 : 143-147

Sundqvist, Bertil

Intermolecular bonding in C₇₀ at high pressure and temperature

Carbon, Elsevier 2017, Vol. 125 : 258-268

Sundqvist, Bertil

Novel Superhard sp³ Carbon Allotrope from Cold-Compressed C₇₀ Peapods

Physical Review Letters, American Physical Society 2017, Vol. 118, (24)

Yang, Xigui; Yao, Mingguang; Wu, Xiangying; et al.

Uniaxial-stress-driven transformation in cold compressed glassy carbon

Applied Physics Letters, Melville: American Institute of Physics (AIP) 2017, Vol. 111, (10)

Yao, Mingguang; Fan, Xianhong; Zhang, Weiwei; et al.

Pressure-induced metallization and amorphization in VO₂(A) nanorods

Physical Review B. Condensed Matter and Materials Physics, Vol. 93, (18)

Cheng, Benyuan; Li, Quanjun; Zhang, Huafang; et al.

High pressure and high temperature induced polymerization of doped C₆₀ materials

Carbon, Elsevier 2016, Vol. 109 : 269-275

Cui, Wen; Sundqvist, Bertil; Sun, Shishuai; et al.

Photoluminescence changes of C₇₀ nano/submicro-crystals induced by high pressure and high temperature

Scientific Reports, Nature Publishing Group 2016, Vol. 6

Liu, Dedi; Liu, Bingbing; Sundqvist, Bertil; et al.

The low-temperature heat capacity of fullerite C₆₀

Low temperature physics (Woodbury, N.Y., Print), American Institute of Physics (AIP) 2015, Vol. 41, (8) : 630-636

Bagatskii, M.I.; Sumarokov, V.V.; Barabashko, M.S.; et al.

Structural Deformation of Sm@C88under High Pressure

Scientific Reports, Nature Publishing Group 2015, Vol. 5

Cui, Jinxing; Yao, Mingguang; Yang, Hua; et al.

Calorimetric measurements on Li₄C₆₀ and Na₄C₆₀

Journal of Chemical Physics, American Institute of Physics (AIP) 2015, Vol. 142, (16)

Inaba, Akira; Miyazaki, Yuji; Michalowski, Pawel P.; et al.

AC impedance of A₄C₆₀ fullerides under pressure

New Journal of Physics, Institute of Physics (IOP) 2015, Vol. 17, (2)

Sundqvist, Bertil; Andersson, Ove; Gong, Chen; et al.

Polarized Raman study of aligned multiwalled carbon nanotubes arrays under high pressure

The Journal of Physical Chemistry C, American Chemical Society (ACS) 2015, Vol. 119, (49) : 27759-27767

Yang, Xigui; Yao, Mingguang; Lu, Weibang; et al.

Tailoring Building Blocks and Their Boundary Interactionfor the Creation of New, Potentially Superhard, Carbon Materials

Advanced Materials, John Wiley & Sons 2015, Vol. 27, (26) : 3962-3968

Yao, Mingguang; Cui, Wen; Du, Mingrun; et al.

Low-temperature dynamics of matrix isolated methane molecules in fullerite C₆₀: the heat capacity, isotope effects

Low temperature physics (Woodbury, N.Y., Print), American Institute of Physics (AIP) 2014, Vol. 40, (8) : 678-684

Bagatskii, M.I.; Manzhelii, V.G.; Sumarokov, V.V.; et al.

Mapping intermolecular bonding in C₆₀

Scientific Reports, Nature Publishing Group 2014, Vol. 4 : 06171-

Sundqvist, Bertil

Electrical resistance of dysprosium under pressure

Journal of Physics Conference Series, 500

Sundqvist, Bertil; Tolpygo, V. K.

Thermal conductivity of highly crystallized polyethylene

Polymer, Oxford: Elsevier 2014, Vol. 55, (1) : 195-200

Yu, Junchun; Sundqvist, Bertil; Tonpheng, Bounphanh; et al.

Reversible pressure-induced polymerization of Fe(C5H5)(2) doped C-70

Carbon, Pergamon-Elsevier Science 2013, Vol. 62 : 447-454

Cui, Wen; Yao, Mingguang; Yao, Zhen; et al.

Stability of the Tomonaga-Luttinger liquid state in gamma-irradiated carbon nanotube bundles

Journal of Physics: Condensed Matter, Institute of Physics Publishing (IOPP) 2013, Vol. 25, (47) : 475302-

Danilchenko, Boris A.; Tripachko, N. A.; Voitsihovska, E. A.; et al.

Effects of alcohols on shape-tuning and luminescence-enhancing of C70 nanocrystals

Optical materials (Amsterdam), Elsevier 2013, Vol. 36, (2) : 449-454

Liu, Dedi; Cui, Wen; Yao, Mingguang; et al.

Detailed mapping of reaction diagrams for metastable phases

Proceedings of Symposium MM, Materials under extreme environments, Fall Meeting 2012 of the Materials Research Society

Sundqvist, Bertil

Ionic conductivity in three crystalline phases of LiBH4 under pressure

High Pressure Research, Taylor & Francis 2013, Vol. 33, (1) : 141-151

Sundqvist, Bertil; Yao, Mingguang; Andersson, Ove

Pressure-induced transformation and superhard phase in fullerenes: the effect of solvent intercalation

Applied Physics Letters, Vol. 103, (7) : 071913-

Yao, Mingguang; Cui, Wen; Xiao, Junping; et al.

Enormous lattice expansion of hummers graphite oxide in alcohols at low temperatures

ACS Nano, American Chemical Society (ACS) 2013, Vol. 7, (2) : 1395-1399

You, Shujie; Sundqvist, Bertil; Talyzin, Alexandr

Selective Intercalation of Graphite Oxide by Methanol in Water/Methanol Mixtures

The Journal of Physical Chemistry C, American Chemical Society (ACS) 2013, Vol. 117, (4) : 1963-1968

You, Shujie; Yu, Junchun; Sundqvist, Bertil; et al.

Buckminsterfullerene: A Strong, Covalently Bonded, Reinforcing Filler and Reversible Cross-Linker in the Form of Clusters in a Polymer

ACS Macro Letters, American Chemical Society (ACS) 2013, Vol. 2, (6) : 511-517

Yu, Junchun; Yao, Mingguang; Gröbner, Gerhard; et al.

Low-temperature heat capacity of fullerite C-60 doped with deuteromethane

Low temperature physics (Woodbury, N.Y., Print), Melville, NY: American Institute of Physics (AIP) 2012, Vol. 38, (1) : 67-73

Bagatskii, M. I.; Sumarokov, V. V.; Dolbin, Alexander V.; et al.

The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes

Low temperature physics (Woodbury, N.Y., Print), American Institute of Physics (AIP) 2012, Vol. 38, (6) : 523-528

Bagatskii, M.I.; Barabashko, M.S.; Dolbin, Alexander V.; et al.

In situ Raman and photoluminescence study on pressure-induced phase transition in C₆₀ nanotubes

Journal of Raman Spectroscopy, Vol. 43, (6) : 737-740

Liu, Dedi; Yao, Mingguang; Li, Quanjun; et al.

Polymerization of C₆₀ under pressure revisited

Extended Abstracts of Carbon 2012, Krakow: Polish Carbon Society 2012 : 608-

Sundqvist, Bertil

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Research projects

22 January 2008 until 31 December 2010

Nanocarbon compounds and composites