Electron microscopic study on SrGdMnO4

Nakano, Hiromi; Ishizawa, Nobuo; Kamegashira, Naoki; Zulhadjri, Zulhadjri; Shishido, Toetsu

doi:10.1016/j.jallcom.2004.12.181

Cited by 3 publications

(4 citation statements)

References 18 publications

(26 reference statements)

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“…2) was not in the symmetrical subgroup of P4 2 /mnm. A similar phase transition was observed in BaEu 2 Mn 2 O 7 [5]. This phase transition might be related to the behavior of the 3d electrons in the Mn 3+ ion.…”

Section: Resultssupporting

confidence: 73%

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Phase behavior of layered manganites BaLn ₂ Mn ₂ O ₇ (Ln = rare earth)

Nakano¹,

Satoh

Kamegashira

et al. 2006

Phys. Status Solidi (c)

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We have found that many phases appear in the layered manganites BaLn 2 Mn 2 O 7 , depending on the synthesis and annealing conditions for each rare earth metal. The BaLn 2 Mn 2 O 7 phase, with a stoichiometric composition synthesized under low oxygen pressure, transforms into another structure upon heating. The transition temperature varies according to the rare earth ion. In the present paper, we summarized the relationship between the transition temperature and rare earth ions. We successfully observed in-situ multiplephase transition of the manganite by thermal TEM. We found a first-order phase transition in Gdmanganite at a relatively high temperature, presumably caused by a change in the behavior of 3d electrons in the Mn 3+ ion. We discuss here the structural transition in BaLn 2 Mn 2 O 7 .

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Section: Resultssupporting

confidence: 73%

“…Kamegashira et al have found the phase transition, whereby the orthorhombic phase of BaLn 2 Mn 2 O 7 changed into a tetragonal phase upon heating, and the phase transition was examined by XRD, DSC and electron conductivity [4]. We recently succeeded in observing in-situ the structural change in BaEu 2 Mn 2 O 7 by thermal TEM [5].…”

Section: Introductionmentioning

confidence: 99%

Phase behavior of layered manganites BaLn ₂ Mn ₂ O ₇ (Ln = rare earth)

Nakano¹,

Satoh

Kamegashira

et al. 2006

Phys. Status Solidi (c)

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“…All samples at selected temperatures exhibit high dielectric constants at low frequency. For example, at 1kHz and room temperature, the values of dielectric constant for the samples with x = 0, 0.1, and 0.3 are 1.80 ×10 4 , 1.58 ×10 4 ,a nd 1.52 ×10 4 ,r espectively. However, at ah igher frequency (100 kHz) these values decrease to 1.16 ×10 4 ,9 .91 × 10 3 ,a nd 5.29 ×10 3 .T his behavior has been observed in many compounds and has been explained by dipole relaxation in which the dipole is able to follow the low frequencies but unable to follow at higher frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…[3] It is well known that the properties of the RP phase depend on the nature and composition of cations at the A-a nd B-site. [4][5][6][7] As reported in [6], antiferromagnetic interactionsi nS rLaMnO 4 gradually decrease when strontium is partially substituted by barium. Sr 2 TiO 4 ,w hich has been found to have no absorption in the visible light spectrum can intensely absorbi nt he 400-600 nm range after doping with Fe 3 + and La 3 + .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sr_1+2xLa_1‐2xFe_1‐xNb_xO₄ (x=0, 0.1, 0.3, and 0.5) by Sol‐gel Method: Structural, Magnetic, and Dielectric Properties

et al. 2020

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REPRINTz Materials Science inc. Nanomaterials &Polymers Synthesis of Sr 1 + + 2x La 1-2x Fe 1-x Nb x O 4 (x = 0, 0.1, 0.3, and 0.5) by Sol-gel Method: Structural, Magnetic, and Dielectric PropertiesArif Kurnia, [a] Emriadi, [a] NandangM ufti, [b] and Zulhadjri* [a] One -l ayered Ruddlesden-Popper phase Sr 1 + 2x La 1-2x Fe 1-x Nb x O 4 doped with niobium was synthesized using as ol-gel method for various Nb concentrations (x = 0, 0.1, 0.3, and 0.5). Singlephase samples could be observed with x = 0a nd 0.1, while x = 0.3 and 0.5 contain additional phases.M icrostructurer esults showed that the increase of niobium content corresponded to ad ecrease in the grain size of the samples. The magnetic measurements indicated that antiferromagnetic interactions of doped samples had decreased. The dielectric constant of the samples decreased as x increased due to the increase in conductivity. The origin of conductioni nthe samples might be caused by hopping conduction due to the mixed oxidation states of iron with charge + 3and + 4.

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New phase of BaLaMnO4-x formed by annealing in a reducing atmosphere

Nakano

Kawabata

Kamegashira

2008

J. Ceram. Soc. Japan

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A single crystal of BaLaMnO 4 with I4/mmm has been synthesized by a floating zone method. A new phase of BaLaMnO 4-x was obtained by annealing the single crystal in a reducing atmosphere at 773 K for 168 h. The structural change was analyzed by four-circle X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The new phase has an orthorhombic unit cell (Cccm) of a＝0.5504(7) nm, b＝0.5502(5) nm, and c＝1.3265(1) nm. The structural change from I4/mmm into Cccm was caused by an oxygen deficiency, and a small amount of Mn 2＋ ions was formed by annealing in a reducing atmosphere.

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Electron microscopic study on SrGdMnO4

Cited by 3 publications

References 18 publications

Phase behavior of layered manganites BaLn ₂ Mn ₂ O ₇ (Ln = rare earth)

Phase behavior of layered manganites BaLn ₂ Mn ₂ O ₇ (Ln = rare earth)

Synthesis of Sr_1+2xLa_1‐2xFe_1‐xNb_xO₄ (x=0, 0.1, 0.3, and 0.5) by Sol‐gel Method: Structural, Magnetic, and Dielectric Properties

New phase of BaLaMnO4-x formed by annealing in a reducing atmosphere

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Electron microscopic study on SrGdMnO4

Cited by 3 publications

References 18 publications

Phase behavior of layered manganites BaLn 2 Mn 2 O 7 (Ln = rare earth)

Phase behavior of layered manganites BaLn 2 Mn 2 O 7 (Ln = rare earth)

Synthesis of Sr1+2xLa1‐2xFe1‐xNbxO4 (x=0, 0.1, 0.3, and 0.5) by Sol‐gel Method: Structural, Magnetic, and Dielectric Properties

New phase of BaLaMnO4-x formed by annealing in a reducing atmosphere

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About

Phase behavior of layered manganites BaLn ₂ Mn ₂ O ₇ (Ln = rare earth)

Phase behavior of layered manganites BaLn ₂ Mn ₂ O ₇ (Ln = rare earth)

Synthesis of Sr_1+2xLa_1‐2xFe_1‐xNb_xO₄ (x=0, 0.1, 0.3, and 0.5) by Sol‐gel Method: Structural, Magnetic, and Dielectric Properties