Transition metal-doped SrTiO3: when does a tiny chemical impact have such a great structural response?

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00586960" target="_blank" >RIV/68378271:_____/24:00586960 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1039/d4tc00180j" target="_blank" >https://doi.org/10.1039/d4tc00180j</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d4tc00180j" target="_blank" >10.1039/d4tc00180j</a>

Result language

angličtina

Original language name

Transition metal-doped SrTiO3: when does a tiny chemical impact have such a great structural response?

Original language description

The effect of doping on the chemical and physical properties of semiconductors, alloys, ferroelectrics, glasses, and other substances has been a classic topic in materials science for centuries. Strontium titanate, SrTiO3, is an archetypal perovskite of interest for both fundamental science as quantum paraelectric and numerous outstanding physical properties and applications, including dielectrics, tunable microwave and photovoltaic devices, superconductors, thermoelectrics, potential multiferroics. Its chemical doping with transition metals leads to new functionalities, but intrinsic mechanisms of structural responses, activated by impurities, have not been systematically investigated. Herein, we present the results of a comparative study of the crystal structure, vibrational spectra, and dielectric properties of SrTiO3:M (M = Mn, Ni, and Fe, 2 at%) single crystals. It is shown that impurities constitute a different tendency to off-centering and the formation of dipoles: Mn and Fe atoms are shifted from the center of the oxygen octahedron, while Ni atoms remain on-centered. As a result, small chemical doping has a dramatic effect on the dielectric response through various structural mechanisms, including the pseudo Jahn-Teller effect, the first-order Jahn-Teller effect, and defect-induced distortion. These findings open up fundamentally new possibilities for the practical solution of a difficult problem: controlling the dielectric responses of quantum paraelectrics by choosing the type of chemical additive.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Materials Chemistry C

ISSN

2050-7526

e-ISSN

2050-7534

Volume of the periodical

12

Issue of the periodical within the volume

22

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

8105-8118

UT code for WoS article

001229774100001

EID of the result in the Scopus database

2-s2.0-85194045512