Special Issue "Magnetic Oxide Materials"

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Inorganic Solid-State Chemistry".

Deadline for manuscript submissions: closed (15 February 2019)

Special Issue Editor

Guest Editor
Dr. Efrain E. Rodriguez

Department of Chemistry and Biochemistry, University of Maryland, College Park, USA
Website | E-Mail
Interests: functional inorganic materials; superconductors; magnetic materials; neutron scattering; solid state chemistry

Special Issue Information

Dear Colleagues,

From high-temperature superconductivity to colossal magnetoresistance, magnetic oxides express a variety of extraordinary phenomena, some of which are still not well understood. This special issue will cover a wide range of transition metal oxides that express functional properties such as metal-to-insulator transitions, ferromagnetism, and half-metallicity to physical properties of more fundamental interest such as magnetic frustration, orbital ordering, and spin glasses. Furthermore, some more recent interest in the field of quantum materials has placed complex oxides that express quantum spin liquid behavior at the forefront. This Special Issue will showcase oxides with a diversity of structure types as well, from perovskites to pyrochlores to spinels to hollandites to those closely related to magnetic frustration (e.g. honeycomb lattices). While the field of magnetic oxides is quite mature with the Goodenough-Kanomori rules elucidated more than 50 years ago, there is still much to discover and understand with recent progress in novel synthetic methods and advanced characterization techniques.

Dr. Efrain E. Rodriguez
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Inorganics is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • spin liquids
  • spin glasses
  • magnetic frustration
  • half-metallic ferromagnets
  • metal-to-insulator transitions
  • charge and orbital ordering
  • perovskites
  • pyrochlores
  • spinels
  • chemie douce
  • neutron scattering
  • magnetic exchange

Published Papers (2 papers)

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Research

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Open AccessArticle
Titanium Doping of the Metallic One-Dimensional Antiferromagnet, Nb12O29
Received: 4 March 2019 / Revised: 7 May 2019 / Accepted: 21 May 2019 / Published: 23 May 2019
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Abstract
Monoclinic Nb12O29 undergoes a charge ordering transition to form antiferromagnetic Nb4+ chains (TN ~ 12 K) spaced 15.7 Å apart, which are coupled through mediation from a subset of metallic electrons which are present over all temperature regimes. [...] Read more.
Monoclinic Nb12O29 undergoes a charge ordering transition to form antiferromagnetic Nb4+ chains (TN ~ 12 K) spaced 15.7 Å apart, which are coupled through mediation from a subset of metallic electrons which are present over all temperature regimes. We present the effects of disrupting the delicate electronic equilibrium in monoclinic Nb12O29 through doping Nb4+ (d1) with Ti4+ (d0) ions in the series, TixNb12−xO29. Powder neutron diffraction demonstrates that Ti is distributed over all of the 6 crystallographically distinct Nb positions. Magnetic susceptibility measurements reveal a rapid suppression of the magnetic ordered state on Ti doping, with a 3% percolation threshold consistent with the existence of one-dimensional Nb4+ chains. The reduction of the number of unpaired electrons on Ti4+ doping is shown to depopulate both localised and itinerant electron subsets, demonstrating that they are intrinsic to the properties of the system, which is argued to be a direct consequence of the mixture of bonding schemes within the lattice. Full article
(This article belongs to the Special Issue Magnetic Oxide Materials)
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Review

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Open AccessReview
High-Pressure Routes to New Pyrochlores and Novel Magnetism
Received: 15 February 2019 / Revised: 15 March 2019 / Accepted: 26 March 2019 / Published: 2 April 2019
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Abstract
The pyrochlore structure (A2B2O7) has been an object of consistent study by materials scientists largely due to the stability of the cubic lattice with respect to a wide variety of chemical species on the A or B [...] Read more.
The pyrochlore structure (A2B2O7) has been an object of consistent study by materials scientists largely due to the stability of the cubic lattice with respect to a wide variety of chemical species on the A or B sites. The criterion for stability under ambient conditions is controlled by the ratio of these cations, which is empirically 1.36 < RA/RB < 1.71. However, under applied pressure synthesis conditions, the pyrochlore lattice is stable up to RA/RB ∼ 2.30, opening up possibilities for new compounds. In this review, we will highlight recent work in exploring new rare-earth pyrochlores such as the germanates RE2Ge2O7 and platinates RE2Pt2O7. We highlight recent discoveries made in these pyrochlores such as highly correlated spin ice behavior, spin liquid ground states, and exotic magnetic ordering. Full article
(This article belongs to the Special Issue Magnetic Oxide Materials)
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