Further study on the phase transition of BaTb2Mn2O7

Kamegashira, Naoki; Umeno, Shigeru; Satoh, Hiroyuki; Horikawa, Matsuhide

doi:10.1016/0254-0584(89)90047-3

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…1 where the space group Immm is also included for comparison. No possibility of ferroelectricity could be considered for this compound since this has semiconducting properties with rather high electrical conductivity [15], suggesting centrosymmetry in the structure. From these results the space group A2/m was chosen as the most probable space group for monoclinic BaTb 2 Mn 2 O 7 .…”

Section: Resultsmentioning

confidence: 99%

“…The general relationship between the fundamental tetragonal unit cell and these two kinds of orthorhombic cells are * Corresponding author. [3,[7][8][9][10][11][12][13][14][15]. It is rather difficult to synthesize single phase of these distorted phases and the formation of these phases depend upon various synthetic conditions such as atmospheric oxygen partial pressure during heating, cooling rate after preparative reaction and other factors.…”

Section: Introductionmentioning

confidence: 99%

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Structural determination of a new phase of monoclinic BaTb2Mn2O7

Kamegashira

Satoh

Meng

et al. 2004

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural determination of a new phase of monoclinic BaTb2Mn2O7

Kamegashira

Satoh

Meng

et al. 2004

Journal of Alloys and Compounds

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“…Accutually, the pattern changed from the orthorhombic symmetry (Pnnm) to tetragonal symmetry (P4 2 /mnm) in the symmetrical subgroup. Transition temperature Rare earth ionic radii (nm) [13] XRD results / K DSC results / K Electrical conductivity results / K Pr 0.114 ---Nd [7] 0.112 523 --Sm [8] 0.109 520 525 525 Eu [9] 0.107 560 550 550 Gd [10] 0.106 559, 773 617, 749 650 Tb [11] 0.104 725 745 755…”

Section: Resultsmentioning

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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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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“…Although a clear boundary between two types of orthorhombic phases seems to exist between Eu and Gd, BaGd 2 Mn 2 O 7 has the two types [6] making this boundary ambiguous. Both types of orthorhombic phases exhibit phase transition into the fundamental tetragonal phase at high temperature [3,[6][7][8][9][10][11][12][13][14][15][16][17]. In addition to these phases a tetragonal phase with superstructure (P4 2 /mnm) was found in polycrystalline BaGd 2 Mn 2 O 7 [18] and single crystals of BaGd 2 Mn 2 O 7 [19] and BaEu 2 Mn 2 O 7 [20].…”

Section: Introductionmentioning

confidence: 99%