http://hdl.handle.net/20.500.12128/11996
Title: | Influence of crystallite size on the magnetic order in semiconducting ZnCr2Se4 nanoparticles |
Authors: | Malicka, Ewa Karolus, Małgorzata Groń, Tadeusz Gudwański, Adrian Ślebarski, Andrzej Goraus, Jerzy Oboz, Monika Sawicki, Bogdan Panek, Joanna |
Keywords: | nanoparticles; semiconductors; antiferromagnetic; spin-glass; specific heat |
Issue Date: | 2019 |
Citation: | Materials, 2019, iss. 23, art. no. 3947 |
Abstract: | Structural, electrical, magnetic, and specific heat measurements were carried out on ZnCr2Se4 single crystal and on nanocrystals obtained from the milling of this single crystal after 1, 3, and 5 h, whose crystallite sizes were 25.2, 2.5, and 2 nm, respectively. For this purpose, the high-energy ball-milling method was used. The above studies showed that all samples have a spinel structure, and are p-type semiconductors with less milling time and n-type with a higher one. In turn, the decrease in crystallite size caused a change in the magnetic order, from antiferromagnetic for bulk material and nanocrystals after 1 and 3 h of milling to spin-glass with the freezing temperature Tf = 20 K for the sample after 5 h of milling. The spin-glass behavior for this sample was derived from a broad peak of dc magnetic susceptibility, a splitting of the zero-field-cooling and field-cooling susceptibilities, and from the shift of Tf towards the higher frequency of the ac susceptibility curves. A spectacular result for this sample is also the lack of a peak on the specific heat curve, suggesting a disappearance of the structural transition that is observed for the bulk single crystal. |
URI: | http://hdl.handle.net/20.500.12128/11996 |
DOI: | 10.3390/ma12233947 |
ISSN: | 1996-1944 |
Appears in Collections: | Artykuły (WNŚiT) |
File | Description | Size | Format | |
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Malicka_Influence_of_crystallite_size.pdf | 1,18 MB | Adobe PDF | View/Open |
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