Dielectric response in the charge-ordered Ca2−xPrxMnO4 phases

Castro-Couceiro, A.; Andújar, Manuel; Rivas‐Murias, B.; Mira, J.; Rivas, J.; Señarı́s-Rodrı́guez, M. A.

doi:10.1016/j.solidstatesciences.2005.03.001

Cited by 21 publications

(13 citation statements)

References 24 publications

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“…Thus, such compound exhibits capacitive behavior, probably associated to electric dipoles formation enhanced by the CO state. Similar behavior has been observed in Pr 0.67 Ca 0.33 MnO 3 by Jardón et al [13] and Rivadulla et al [14] and in Ca 2−x Pr x MnO 4 by Castro-Couceiro et al [22]. These observations are significantly different from what we find in the non-charge-ordered (NCO) compound (x = 0.15), where only a regular monotonous variation is seen in Z (T) logarithm representation ( Fig.…”

Section: Electrical Propertiessupporting

confidence: 80%

“…8) with an energy gap of about 43 and 31 meV for x = 0.175 and 0.2, respectively. This can be interpreted by the presence of a charge-ordering (CO) transition at T CO depending on Pr-doping content [22]. Such charge-ordering is a consequence of the modification of electronic state due to the correlation between the charge carriers of Mn (3d) electrons [30], which point out to the strong competition between FM double exchange interactions, AFM super exchange interactions and the spin-phonon coupling [31].…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…The Ca 2−x Ln x MnO 4 compounds (Ln = Pr, Sm, Gd, Ho), exhibiting a classical K 2 NiF 4 -type structure, are good examples of RP manganites and are a subject of diverse magnetic, electric, dielectric, and charge-ordering studies. For Ln = Pr, dielectric characterisation of Mn 3+ /Mn 4+ mixed oxides Ca 2−x Pr x MnO 4 (x = 0.25, 0.33 and 0.50) shows a CO transition at T CO depending on x-value [22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Charge ordering analysis by electrical and dielectric measurements in Ca2−xPrxMnO4 (x=0–0.2) compounds

Tlili

Chihaoui

Bejar

et al. 2011

Journal of Alloys and Compounds

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Section: Electrical Propertiessupporting

confidence: 80%

Section: Electrical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Charge ordering analysis by electrical and dielectric measurements in Ca2−xPrxMnO4 (x=0–0.2) compounds

Tlili

Chihaoui

Bejar

et al. 2011

Journal of Alloys and Compounds

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“…Among them "liquid" electrodes, i.e., conducting material on the surface, such as silver painting or sputtering [8], conductive glue with copper tape [9], water with NaCl [10] are popular solutions. A liquid metal electrode may however change the material properties and be toxic [7], for instance, thin samples may absorb a paint solvent and vapors of mercury are toxic.…”

Section: Electrode Contactsmentioning

confidence: 99%

Enhanced accuracy in dielectric response material characterization by air reference method

Bengtsson

Blennow

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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This document has been downloaded from Chalmers Publication Library (CPL). It is the author´sversion of a work that was accepted for publication in: IEEE transactions on dielectrics and electrical insulation (ISSN: 1070-9878)Citation for the published paper: Xu, X. ; Bengtsson, T. ; Blennow, J. (2013) ABSTRACTDielectric response measurements are an important technique to characterize dielectric materials. However, the electrode arrangements as well as the accuracy of the measurement setup limit the precision of this characterization, especially in case of solid dielectric materials. An air reference method and a contact-free electrode arrangement are described in this paper to enhance the dielectric characterization accuracy by avoiding problems introduced by electrode contacts. It is shown that by performing a calibration with electrode gap filled with air under the same conditions as the material is tested, the air reference method can improve the measurement accuracy substantially. This type of approach also eliminates the need of a detailed model of the analog measurement circuit. In conjunction with the contact-free measurements, the approach allows for avoiding complicated and time-consuming sample preparation procedures. The measurement methodology as well as the electrode arrangement and error increase estimates are presented and evaluated by using different dielectric response instruments and materials.Index Terms -Dielectric material characterization, dielectric frequency response, air reference method, shunt characterization, contact-free electrode arrangement.

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“…The classic method used to induce Mn 3+ /Mn 4+ mixed valence involves substituting Ca 2+ ion by a trivalent or tetravalent element [19][20][21][22]. However, it was found that this method induces a variation (increase or reduction) of the substituted sites radii, leading to an important modification of the structure and structural properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of the oxygen deficiency on the physical properties of Ca2MnO4−δ compounds

Chihaoui

Bejar

Dharhi

et al. 2011

Journal of Alloys and Compounds

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Dielectric response in the charge-ordered Ca2−xPrxMnO4 phases

Cited by 21 publications

References 24 publications

Charge ordering analysis by electrical and dielectric measurements in Ca2−xPrxMnO4 (x=0–0.2) compounds

Charge ordering analysis by electrical and dielectric measurements in Ca2−xPrxMnO4 (x=0–0.2) compounds

Enhanced accuracy in dielectric response material characterization by air reference method

Effect of the oxygen deficiency on the physical properties of Ca2MnO4−δ compounds

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