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Crystals, Volume 15, Issue 3

March 2025 - 88 articles

Cover Story: Nematic liquid crystals exhibit topological defects which are resolved by polarising microscopy. This makes them ideal candidates to study the dynamics of defect annihilation, a process which is observed in practically all materials and over length scales from atoms to cosmological dimensions. Umbilical defects are a clean system to investigate annihilation scaling laws D~tα (D: distance, t: time), as only defects of strength s = ±1 are formed. Defects of opposite strength attract and commonly annihilate via a universal square-root law with α = 0.5. Using machine learning techniques, we show that for liquid crystal systems doped with nanoparticles of different size and concentration, this universality of the annihilation exponent α = 0.5 seems to be violated with exponents approaching α ≈ 0.37 ± 0.02 for increasing concentration and particle size. View this paper
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Articles (88)

  • Article
  • Open Access
4 Citations
1,208 Views
17 Pages

Preparation of TiO2/α-Fe2O3@SiO2 Nanorod Heterostructures and Their Applications for Efficient Photodegradation of Methylene Blue

  • Yujeong Jeong,
  • Kyubeom Lee,
  • Gaeun Kim,
  • Eun-Hye Jang,
  • Youngson Choe,
  • Seok Kim and
  • Sungwook Chung

17 March 2025

A facile solvo-hydrothermal method was used to synthesize sub-100 nm diameter TiO2/α-Fe2O3@SiO2 nanorods (TiO2/HNRs@SiO2). Thermal annealing of TiO2/HNRs@SiO2 activated the photosensitizing crystalline TiO2 domains containing mixed anatase and...

  • Article
  • Open Access
754 Views
10 Pages

Influence of Milling Energy and Precursors on CaKFe4As4 Polycrystalline Superconductor Morphology

  • Anastasiya Duchenko,
  • Achille Angrisani Armenio,
  • Giuseppe Celentano,
  • Alessandra Fava,
  • Daniele Mirabile Gattia,
  • Nicola Pompeo,
  • Enrico Silva,
  • Francesca Varsano and
  • Andrea Masi

17 March 2025

The synthesis of CaKFe4As4 superconducting compounds either requires the adoption of high-temperature synthesis or implies the intimate mixing of the precursors via mechanochemical routes before the thermal step in order to avoid chemical inhomogenei...

  • Article
  • Open Access
4 Citations
1,886 Views
17 Pages

16 March 2025

Calculation of second-order derivatives of energy using the DFT method is a valuable approach for the estimation of both the thermodynamical and mechanical properties of organic crystals from the first principles. This type of calculation requires sp...

  • Review
  • Open Access
1,538 Views
18 Pages

15 March 2025

Phosphorescent Pt(II) complexes have garnered significant attention as key components in luminescence-based systems due to their highly efficient emission properties. A notable characteristic of these complexes is their ability to form excimers throu...

  • Article
  • Open Access
3 Citations
2,407 Views
11 Pages

15 March 2025

Lithium nickel manganese cobalt oxides (NMCs) are widely used as cathode materials in commercial batteries. Efforts have been made to enhance battery energy density and stability by adjusting the element ratio. Nickel-rich NMC shows promise due to it...

  • Review
  • Open Access
11 Citations
6,410 Views
20 Pages

14 March 2025

Excessive use of conventional cooling devices, such as air conditioners, produces an increase in the urban heat island phenomenon, which causes exacerbating climate change and environmental degradation. In response, this review focuses on the potenti...

  • Review
  • Open Access
2 Citations
4,396 Views
12 Pages

Sputtered LiNbO3 Thin Films for Application in Integrated Photonics: A Review

  • Igor Kuznetsov,
  • Anton Perin,
  • Angelina Gulyaeva and
  • Vladimir Krutov

14 March 2025

LiNbO3 plays a significant role in modern integrated photonics because of its unique properties. One of the challenges in modern integrated photonics is reducing chip production cost. Today, the most widespread yet expensive method to fabricate thin...

  • Article
  • Open Access
1 Citations
829 Views
11 Pages

Tb3+-Doped LGS Crystals: Crystal Growth and Electro-Elastic Features

  • Nianlong Zhang,
  • Jipeng Wu,
  • Hengyuan Zhang,
  • Feifei Chen,
  • Fapeng Yu,
  • Li Sun and
  • Xian Zhao

13 March 2025

Piezoelectric materials have garnered significant attention due to their diverse applications in technologies such as sensors, actuators, and energy-harvesting systems. This study focuses on the growth and characterization of Tb3+-doped La3Ga5SiO14 (...

  • Article
  • Open Access
3 Citations
1,033 Views
21 Pages

13 March 2025

Refill friction stir spot welding (RFSSW) is an effective technique for achieving high-quality joints in metallic materials, with rotational speed being a critical parameter influencing joint quality. Current research on RFSSW has primarily focused o...

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Crystals - ISSN 2073-4352