Study of low-dimensional magnetism in zeolitic imidazolate frameworks

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F23%3A43928175" target="_blank" >RIV/60461373:22310/23:43928175 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jmmm.2023.171318" target="_blank" >https://doi.org/10.1016/j.jmmm.2023.171318</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmmm.2023.171318" target="_blank" >10.1016/j.jmmm.2023.171318</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study of low-dimensional magnetism in zeolitic imidazolate frameworks

Popis výsledku v původním jazyce

Applying the procedure of a rapid synthesis in the aqueous system, nanocrystalline form of ZIF-8 and Cu-ZIF was obtained. The composition of the latter was inferred from the comparison of vibration spectra and lattice specific heats of both compounds which become nearly identical. The nanocrystalline character of both compounds prevented direct comparison of powder XRD patterns and manifested by the appearance of a boson peak in the diamagnetic ZIF-8 specific heat. The low-temperature magnetic contribution in Cu-ZIF specific heat and a Curie-Weiss tail in low-temperature susceptibility may originate from the effect of surface spins while the round maximum observed in the susceptibility at 135 K indicates the presence of strong low-dimensional correlations with the exchange coupling similar to 200 K. Corresponding magnetic contribution cannot be observed in the specific heat due to the huge overlap by the high-temperature lattice contribution. Negligible magnetization values at low temperatures correspond to the aforementioned strong antiferromagnetic coupling. Future experimental scenarios are discussed which should provide better understanding of the bulk and surface magnetism in this unique quantum system.

Název v anglickém jazyce

Study of low-dimensional magnetism in zeolitic imidazolate frameworks

Popis výsledku anglicky

Applying the procedure of a rapid synthesis in the aqueous system, nanocrystalline form of ZIF-8 and Cu-ZIF was obtained. The composition of the latter was inferred from the comparison of vibration spectra and lattice specific heats of both compounds which become nearly identical. The nanocrystalline character of both compounds prevented direct comparison of powder XRD patterns and manifested by the appearance of a boson peak in the diamagnetic ZIF-8 specific heat. The low-temperature magnetic contribution in Cu-ZIF specific heat and a Curie-Weiss tail in low-temperature susceptibility may originate from the effect of surface spins while the round maximum observed in the susceptibility at 135 K indicates the presence of strong low-dimensional correlations with the exchange coupling similar to 200 K. Corresponding magnetic contribution cannot be observed in the specific heat due to the huge overlap by the high-temperature lattice contribution. Negligible magnetization values at low temperatures correspond to the aforementioned strong antiferromagnetic coupling. Future experimental scenarios are discussed which should provide better understanding of the bulk and surface magnetism in this unique quantum system.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA21-02550S" target="_blank" >GA21-02550S: Plazmonem indukované zachycení excitovaného spinového stavu v komplexech se spinovým krosoverem</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ISSN

0304-8853

e-ISSN

1873-4766

Svazek periodika

587

Číslo periodika v rámci svazku

DEC 1 2023

Stát vydavatele periodika

ZA - Jihoafrická republika

Počet stran výsledku

6

Strana od-do

"171318/1"-6

Kód UT WoS článku

001092062200001

EID výsledku v databázi Scopus

2-s2.0-85173142717