TY - JOUR
T1 - Correlation between Structural Changes and Electrical Transport Properties of Spinel ZnFe 2 O 4 Nanoparticles under High Pressure
AU - Zhang, Junkai
AU - Zhang, Yilin
AU - Wu, Xiaoxin
AU - Ma, Yanzhang
AU - Chien, Su Ying
AU - Guan, Renquan
AU - Zhang, Dongzhou
AU - Yang, Bin
AU - Yan, Bingmin
AU - Yang, Jinghai
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11504132, 21878119, 21776110, and 61775081) and the Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province (Item No. JJKH20180769KJ). In situ high-pressure XRD experiments were performed at the 13-BM-C of GeoSoilEnviroCARS (The University of Chicago, Sector 13), Advanced Photon Source (APS) and Argonne National Laboratory (ANL). GeoSoilEnviroCARS is supported by the National Science Foundation Earth Sciences (Grant No. EAR-1128799) and Department of Energy-GeoSciences (Grant No. DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11504132, 21878119, 21776110, and 61775081) and the Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province (Item No. JJKH20180769KJ). In situ high-pressure XRD experiments were performed at the 13-BM-C of GeoSoilEnviroCARS (The University of Chicago, Sector 13), Advanced Photon Source (APS), and Argonne National Laboratory (ANL). GeoSoilEnviroCARS is supported by the National Science Foundation Earth Sciences (Grant No. EAR-1128799) and Department of Energy-GeoSciences (Grant No. DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/12/12
Y1 - 2018/12/12
N2 - The structural phase transition of synthetic ZnFe 2 O 4 nanoparticles (ZFO NPs) is investigated as a function of pressure up to 40.6 GPa at room temperature for the first time, and its associated intriguing electrical transport properties are resolved from in situ impedance spectra and magnetoresistivity measurements. Significant anomalies are observed in the properties of the grain boundary resistance (R gb ), the relaxation frequency (f max ), and the relative permittivity (μ r ) in the ZFO NPs under the pressures around 17.5-21.5 GPa. These anomalies are believed to be correlated with a cubic-to-orthorhombic phase transition of ZnFe 2 O 4 at the pressures between 21.9 and 25.7 GPa, which is found to be partially reversible. The pressure-tuned dielectric properties are measured for the cubic and the orthorhombic phases of ZFO, respectively. Remarkably, R gb decreases up to 6 orders of magnitude as a function of pressure in the cubic phase. The dielectric polarization is obviously strengthened with increased f max and decreased μ r with pressure in the orthorhombic phase. Furthermore, it is confirmed that the external pressure effectively improves the electrochemical stability of the sample based on the cycled measurements of the impedance spectra at various pressures. The changes in the complex permittivity (μ′, μ″) and the dielectric loss tangent (tan δ) with frequency reveal the irreversible increase in the dielectric loss accompanied by phase transition. The MR measurements indicate that ZFO NPs are superparamagnetic under high pressure of up to 40 GPa. The transmission electron microscopy images reflect the decrease in the grain boundary number and some local amorphization of grains after compression, which provides good explanations for the changes in the electrical transport properties as a function of pressure. Herein, the structural and electrical properties of ZnFe 2 O 4 NPs generated are preserved by quenching the high-pressure phase to ambient conditions, thus providing great choices of ferrites materials for a variety of applications.
AB - The structural phase transition of synthetic ZnFe 2 O 4 nanoparticles (ZFO NPs) is investigated as a function of pressure up to 40.6 GPa at room temperature for the first time, and its associated intriguing electrical transport properties are resolved from in situ impedance spectra and magnetoresistivity measurements. Significant anomalies are observed in the properties of the grain boundary resistance (R gb ), the relaxation frequency (f max ), and the relative permittivity (μ r ) in the ZFO NPs under the pressures around 17.5-21.5 GPa. These anomalies are believed to be correlated with a cubic-to-orthorhombic phase transition of ZnFe 2 O 4 at the pressures between 21.9 and 25.7 GPa, which is found to be partially reversible. The pressure-tuned dielectric properties are measured for the cubic and the orthorhombic phases of ZFO, respectively. Remarkably, R gb decreases up to 6 orders of magnitude as a function of pressure in the cubic phase. The dielectric polarization is obviously strengthened with increased f max and decreased μ r with pressure in the orthorhombic phase. Furthermore, it is confirmed that the external pressure effectively improves the electrochemical stability of the sample based on the cycled measurements of the impedance spectra at various pressures. The changes in the complex permittivity (μ′, μ″) and the dielectric loss tangent (tan δ) with frequency reveal the irreversible increase in the dielectric loss accompanied by phase transition. The MR measurements indicate that ZFO NPs are superparamagnetic under high pressure of up to 40 GPa. The transmission electron microscopy images reflect the decrease in the grain boundary number and some local amorphization of grains after compression, which provides good explanations for the changes in the electrical transport properties as a function of pressure. Herein, the structural and electrical properties of ZnFe 2 O 4 NPs generated are preserved by quenching the high-pressure phase to ambient conditions, thus providing great choices of ferrites materials for a variety of applications.
KW - electrical transport properties
KW - grain boundary
KW - high pressure
KW - phase transition
KW - spinel ferrite
UR - http://www.scopus.com/inward/record.url?scp=85058127304&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b15259
DO - 10.1021/acsami.8b15259
M3 - Article
C2 - 30431260
AN - SCOPUS:85058127304
VL - 10
SP - 42856
EP - 42864
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
SN - 1944-8244
IS - 49
ER -