@article{MTMT:34727542,
	title = {Transzmissziós elektronmikroszkópia az MFA-ban},
	url = {https://m2.mtmt.hu/api/publication/34727542},
	author = {Lábár, János and Pécz, Béla},
	journal-iso = {FIZIKAI SZEMLE},
	journal = {FIZIKAI SZEMLE},
	volume = {74},
	unique-id = {34727542},
	issn = {0015-3257},
	year = {2024},
	pages = {84-87},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Pécz, Béla/0000-0002-4651-6972}
}

@article{MTMT:34332659,
	title = {Superconductivity in laser-annealed monocrystalline silicon films: The role of boron implant},
	url = {https://m2.mtmt.hu/api/publication/34332659},
	author = {Dumas, P. and Opprecht, M. and Kerdilès, S. and Lábár, János and Pécz, Béla and Lefloch, F. and Nemouchi, F.},
	doi = {10.1063/5.0166870},
	journal-iso = {APPL PHYS LETT},
	journal = {APPLIED PHYSICS LETTERS},
	volume = {123},
	unique-id = {34332659},
	issn = {0003-6951},
	year = {2023},
	eissn = {1077-3118},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Pécz, Béla/0000-0002-4651-6972}
}

@CONFERENCE{MTMT:34487551,
	title = {SZUPRAVEZETŐ SZILÍCIUM. Superconducting Silicon},
	url = {https://m2.mtmt.hu/api/publication/34487551},
	author = {Lábár, János and Pécz, Béla and Sulyok, Attila and Chiod, F},
	booktitle = {A Magyar Mikroszkópos Társaság éves konferenciájának kivonatkönyve 2023 : Book of the Abstracts of the Annual Conference of HSM 2023},
	unique-id = {34487551},
	year = {2023},
	pages = {54-56},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Pécz, Béla/0000-0002-4651-6972}
}

@article{MTMT:34435393,
	title = {Simple ePDF: A Pair Distribution Function Method Based on Electron Diffraction Patterns to Reveal the Local Structure of Amorphous and Nanocrystalline Materials},
	url = {https://m2.mtmt.hu/api/publication/34435393},
	author = {Lábár, János and Hajagos-Nagy, Klára and Das, Partha P. and Gomez-Perez, Alejandro and Radnóczi, György},
	doi = {10.3390/nano13243136},
	journal-iso = {NANOMATERIALS-BASEL},
	journal = {NANOMATERIALS},
	volume = {13},
	unique-id = {34435393},
	abstract = {Amorphous, glassy or disordered materials play important roles in developing structural materials from metals or ceramics, devices from semiconductors or medicines from organic compounds. Their local structure is frequently similar to crystalline ones. A computer program is presented here that runs under the Windows operating system on a PC to extract pair distribution function (PDF) from electron diffraction in a transmission electron microscope (TEM). A polynomial correction reduces small systematic deviations from the expected average Q-dependence of scattering. Neighbor distance and coordination number measurements are supplemented by either measurement or enforcement of number density. Quantification of similarity is supported by calculation of Pearson’s correlation coefficient and fingerprinting. A rough estimate of fractions in a mixture is computed by multiple least-square fitting using the PDFs from components of the mixture. PDF is also simulated from crystalline structural models (in addition to measured ones) to be used in libraries for fingerprinting or fraction estimation. Crystalline structure models for simulations are obtained from CIF files or str files of ProcessDiffraction. Data from inorganic samples exemplify usage. In contrast to previous free ePDF programs, our stand-alone program does not need a special software environment, which is a novelty. The program is available from the author upon request.},
	keywords = {GLASS; nanocrystals; DECOMPOSITION; automation; TEM; electron diffraction; Coordination number; Disordered materials; PDF; nearest-neighbor distance},
	year = {2023},
	eissn = {2079-4991},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Radnóczi, György/0000-0002-5056-7625}
}

@article{MTMT:33698442,
	title = {Strain Measurement in Single Crystals by 4D-ED},
	url = {https://m2.mtmt.hu/api/publication/33698442},
	author = {Lábár, János and Pécz, Béla and van, Waveren Aiken and Hallais, Géraldine and Desvignes, Léonard and Chiodi, Francesca},
	doi = {10.3390/nano13061007},
	journal-iso = {NANOMATERIALS-BASEL},
	journal = {NANOMATERIALS},
	volume = {13},
	unique-id = {33698442},
	abstract = {A new method is presented to measure strain over a large area of a single crystal. The 4D-ED data are collected by recording a 2D diffraction pattern at each position in the 2D area of the TEM lamella scanned by the electron beam of STEM. Data processing is completed with a new computer program (available free of charge) that runs under the Windows operating system. Previously published similar methods are either commercial or need special hardware (electron holography) or are based on HRTEM, which involves limitations with respect to the size of the field of view. All these limitations are overcome by our approach. The presence of defects results in small local changes in orientation that change the subset of experimentally available diffraction spots in the individual patterns. Our method is based on a new principle, namely fitting a lattice to (a subset of) measured diffraction spots to improve the precision of the measurement. Although a spot to be measured may be missing in some of the patterns even the missing spot can be precisely measured by the lattice determined from the available spots. Application is exemplified by heavily boron-doped silicon with intended usage as a low-temperature superconductor in qubits.},
	keywords = {Stem; Strain components; reciprocal space lattice fitting; free computer program; superconducting silicon; concentration of substitutional atom; boron in silicon},
	year = {2023},
	eissn = {2079-4991},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Pécz, Béla/0000-0002-4651-6972}
}

@article{MTMT:33731168,
	title = {Statistical properties of fractal type dislocation cell structures},
	url = {https://m2.mtmt.hu/api/publication/33731168},
	author = {Lipcsei, Sándor and Kalácska, Szilvia and Ispánovity, Péter Dusán and Lábár, János and Dankházi, Zoltán and Groma, István},
	doi = {10.1103/PhysRevMaterials.7.033604},
	journal-iso = {PHYS REV MAT},
	journal = {PHYSICAL REVIEW MATERIALS},
	volume = {7},
	unique-id = {33731168},
	issn = {2475-9953},
	year = {2023},
	eissn = {2475-9953},
	orcid-numbers = {Lipcsei, Sándor/0000-0003-2220-105X; Kalácska, Szilvia/0000-0001-5601-5859; Ispánovity, Péter Dusán/0000-0002-9956-0061; Lábár, János/0000-0002-3944-8350; Dankházi, Zoltán/0000-0001-9545-2015; Groma, István/0000-0002-6644-1365}
}

@article{MTMT:32582299,
	title = {Influence of Molybdenum on the Microstructure, Mechanical Properties and Corrosion Resistance of Ti20Ta20Nb20(ZrHf)20−xMox (Where: x = 0, 5, 10, 15, 20) High Entropy Alloys},
	url = {https://m2.mtmt.hu/api/publication/32582299},
	author = {Glowka, Karsten and Zubko, Maciej and Świec, Paweł and Prusik, Krystian and Szklarska, Magdalena and Chrobak, Dariusz and Lábár, János and Stróż, Danuta},
	doi = {10.3390/ma15010393},
	journal-iso = {MATERIALS},
	journal = {MATERIALS},
	volume = {15},
	unique-id = {32582299},
	abstract = {The presented work was focused on investigating the influence of the (hafnium and zirconium)/molybdenum ratio on the microstructure and properties of Ti20Ta20Nb20(ZrHf)20−xMox (where: x = 0, 5, 10, 15, 20 at.%) high entropy alloys in an as-cast state. The designed chemical composition was chosen due to possible future biomedical applications. Materials were obtained from elemental powders by vacuum arc melting technique. Phase analysis revealed the presence of dual body-centered cubic phases. X-ray diffraction showed the decrease of lattice parameters of both phases with increasing molybdenum concentration up to 10% of molybdenum and further increase of lattice parameters. The presence of two-phase matrix microstructure and hafnium and zirconium precipitates was proved by scanning and transmission electron microscopy observation. Mechanical property measurements revealed decreased micro- and nanohardness and reduced Young’s modulus up to 10% of Mo content, and further increased up to 20% of molybdenum addition. Additionally, corrosion resistance measurements in Ringers’ solution confirmed the high biomedical ability of studied alloys due to the presence of stable oxide layers.},
	year = {2022},
	eissn = {1996-1944},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350}
}

@article{MTMT:33187153,
	title = {Influence of Degree of Severe Plastic Deformation on Thermal Stability of an HfNbTiZr Multi-Principal Element Alloy Processed by High-Pressure Torsion},
	url = {https://m2.mtmt.hu/api/publication/33187153},
	author = {Hung, Pham Tran and Kawasaki, Megumi and Szabo, Abel and Lábár, János and Hegedus, Zoltan and Gubicza, Jenő},
	doi = {10.3390/nano12193371},
	journal-iso = {NANOMATERIALS-BASEL},
	journal = {NANOMATERIALS},
	volume = {12},
	unique-id = {33187153},
	abstract = {Severe plastic deformation (SPD) is an effective route for the nanocrystallization of multi-principal element alloys (MPEAs). The stability of the refined microstructure is important, considering the high temperature applications of these materials. In the present study, the effect of SPD on the stability of a body-centered cubic (bcc) HfNbTiZr MPEA was investigated. SPD was performed using a high-pressure torsion (HPT) technique by varying the number of turns between 1/2 and 10. The evolution of phase composition and microstructure was studied near the disk centers and edges where the imposed strain values were the lowest and highest, respectively. Thus, the shear strain caused by HPT varies between 3 (1/2 turn, near the center) and 340 (10 turns, near the edge). It was found that during annealing up to 1000 K, the bcc HfNbTiZr alloy decomposed into two bcc phases with different lattice constants at 740 K. In addition, at high strains a hexagonal close packed (hcp) phase was formed above 890 K. An inhomogeneous elemental distribution was developed at temperatures higher than 890 K due to the phase decomposition. The scale of the chemical heterogeneities decreased from about 10 mu m to 30 nm where the shear strain increased from 3 to 340, which is similar to the magnitude of grain refinement. Anneal-induced hardening was observed in the MPEA after HPT for both low and high strains at 740 K, i.e., the hardness of the HPT-processed samples increased due to heat treatment. At low strain, the hardness remained practically unchanged between 740 and 1000 K, while for the alloy receiving high strains there was a softening in this temperature range.},
	keywords = {DISLOCATIONS; annealing; hardness; severe plastic deformation; HfNbTiZr multi-principal element alloy},
	year = {2022},
	eissn = {2079-4991},
	orcid-numbers = {Kawasaki, Megumi/0000-0003-0028-3007; Lábár, János/0000-0002-3944-8350; Gubicza, Jenő/0000-0002-8938-7293}
}

@article{MTMT:32549660,
	title = {Thermal stability of nanocrystalline CoCrFeNi multi-principal element alloy: Effect of the degree of severe plastic deformation},
	url = {https://m2.mtmt.hu/api/publication/32549660},
	author = {Hung, Pham Tran and Kawasaki, Megumi and Han, Jae-Kyung and Szabó, Ábel and Lábár, János and Hegedűs, Zoltán and Gubicza, Jenő},
	doi = {10.1016/j.intermet.2021.107445},
	journal-iso = {INTERMETALLICS},
	journal = {INTERMETALLICS},
	volume = {142},
	unique-id = {32549660},
	issn = {0966-9795},
	abstract = {The effect of the degree of severe plastic deformation (SPD) on the thermal stability of a nanocrystalline CoCrFeNi multi-principal element alloy was studied. The SPD method of high-pressure torsion (HPT) was utilized to achieve the nanocrystalline microstructure. The structural stability was investigated near the centers and edges of the HPT-processed disks deformed for ½, 1, 5 and 10 turns. For almost all studied samples, two exothermic peaks in the temperature ranges of 600–750 and 750–950 K were observed by differential scanning calorimetry (DSC) between room temperature and 1000 K. The saturation released heat value for the first DSC peak was about 4 J/g that was achieved at the shear strain of ∼200. For the second exothermic peak, the released heat saturated at the shear strain of about 20 with the value of about 6–7 J/g. It was revealed that the first DSC peak is related to the annihilation of dislocations for low degree of deformation. At the same time, for edge parts of the disks processed by one or higher numbers of turns the vacancy annihilation has also a major contribution to the first exothermic peak. The annihilated vacancy concentration estimated from the released heat was between (0.6–0.9) × 10−3. The second DSC peak was related to the disappearance of grain boundaries due to recrystallization and annihilation of the remaining dislocations. The HPT-processed CoCrFeNi MPEA samples exhibited very high hardness values between 4000 and 5100 MPa, depending on the number of turns and the location along the disk radius. The hardness decreased only during the second exothermic peak when recrystallization occurred.},
	keywords = {DISLOCATIONS; hardness; thermal stability; HIGH-PRESSURE TORSION; Released heat; CoCrFeNi multi-principal element alloy},
	year = {2022},
	eissn = {1879-0216},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Gubicza, Jenő/0000-0002-8938-7293}
}

@{MTMT:33342457,
	title = {A TEM szerepe a Qubitek fejlesztésében. Role of TEM in the development of Qubits},
	url = {https://m2.mtmt.hu/api/publication/33342457},
	author = {Lábár, János and Pécz, Béla and Francesca, Chiodi and Fabrice, Nemouchi and Zhen, Zhang and Shi-Li, Zhang and François, Lefloch},
	booktitle = {A Magyar Mikroszkópos Társaság 2022 Konferenciájának Kivonatkönyve},
	unique-id = {33342457},
	year = {2022},
	pages = {146-149},
	orcid-numbers = {Lábár, János/0000-0002-3944-8350; Pécz, Béla/0000-0002-4651-6972}
}