Magnetic properties of synthetic Ni ₃ Si ₂ O ₅ (OH) ₄ nanotubes

Abstract

The present study focuses on the magnetic properties of the nanotubular Ni3Si2O5(OH)4 pecoraite, the structural analogue of chrysotile, obtained by hydrothermal synthesis. The cell parameters of the material, determined by X-ray diffraction, are , , and . The element analysis revealed the decrease of the Ni:Si ratio after hydrothermal treatment. The synthesized nanotubes have bigger outer and inner diameters in comparison to chrysotile. Using a vibration sample magnetometer, we determined the temperature of the ferromagnetic transition (23.7 K), of the ion in pecoraite and the blocking temperature (18 K).

Tuning the electronic and magnetic properties of lizardite clay by chemical substitution

“…Exchange couplings are then extracted by fitting the total energies to the nearest neighbor (NN) Heisenberg model, as discussed by Gopal et al 32 A simple mean field model is used to calculate the Curie temperature ( T c = 2Δ E /3 k B ), where Δ E is the total energy difference between the FM and AFM configurations and k B denotes the Boltzmann constant. Our results indicate that Ni Mg substituted lizardite has a ferromagnetic stable state with T c around 27.41 K, which is in good agreement with the experimental result at 23.7 K obtained by Krasilin et al 30 for pecoraite. Both the spin channels in Ni Mg lizardite are semiconducting (Fig.…”

“…28,29 Furthermore, synthetic pecoraite Ni 3 (Si 2 O 5 )(OH) 4 , which has a similar chemical composition, isostructural to chrysotile, has been recently synthesized in nanotubes with a magnetic order. 30 Pecoraite has a geometric structure with 72 atoms in the primitive cell, and two lizardite-like layers in the z-direction, shifted in the x-y plane.…”

Cation Redistribution along the Spiral of Ni‐Doped Phyllosilicate Nanoscrolls: Energy Modelling and STEM/EDS Study

“…Individual nanoscrolls demonstrate good mechanical properties,, which are appropriate for reinforcement of polymer composites. Change of Mg by a d ‐element like Ni enhances magnetic properties of the particles ,. The d ‐element can then be reduced from the silicate matrix by hydrogen in order to produce composite materials with catalytic activity ,…”

“…Change of Mg by a delement like Ni enhances magnetic properties of the particles. [24,25] The d-element can then be reduced from the silicate matrix by hydrogen in order to produce composite materials with catalytic activity. [26,27] Cations substitutions in the phyllosilicate layer change size and morphology of the resulting nanotubes and nanoscrolls.…”