Synthesis and crystal structure of (Ca, R)(Mn, Ti)O3 (R, rare earth)

Kobayashi, Migaku; Katsuraya, Ryouko; Kurita, S.; Yamaguchi, Makoto; Satoh, Hiroshisa; Kamegashira, Naoki

doi:10.1016/j.jallcom.2004.12.129

Cited by 13 publications

(8 citation statements)

References 9 publications

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“…Weak peaks for YTiO 2.085 and some unknown phases are seen in Figure 1b. The reflections for major phase are also similar to those for Y 0.33 Ca 0.67 Ti 0.67 Mn 0.33 O 3 reported by Kobayashi et al [17]. The crystal structure for YCTM4 is different from YT as Ca and Mn were added.…”

Section: Resultssupporting

confidence: 83%

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

et al. 2015

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(YCa)(TiMn)O3–δ ceramics prepared using a reaction-sintering process were investigated. Without any calcination involved, the mixture of raw materials was pressed and sintered directly. Y2Ti2O7 instead of YTiO3 formed when a mixture of Y2O3 and TiO2 with Y/Ti ratio 1/1 were sintered in air. Y2Ti2O7, YTiO2.085 and some unknown phases were detected in Y0.6Ca0.4Ti0.6Mn0.4O3–δ. Monophasic Y0.6Ca0.4Ti0.4Mn0.6O3–δ ceramics were obtained after 1400–1500 °C sintering. Dense Y0.6Ca0.4Ti0.4Mn0.6O3–δ with a density 4.69 g/cm3 was observed after 1500 °C/4 h sintering. Log σ for Y0.6Ca0.4Ti0.6Mn0.4O3–δ increased from –3.73 Scm–1 at 350 °C to –2.14 Scm–1 at 700 °C. Log σ for Y0.6Ca0.4Ti0.4Mn0.6O3–δ increased from –2.1 Scm–1 at 350 °C to –1.36 Scm–1 at 700 °C. Increasing Mn content decreased activation energy Ea and increased electrical conductivity. Reaction-sintering process is proved to be a simple and effective method to obtain (YCa)(TiMn)O3–δ ceramics for interconnects in solid oxide fuel cells.

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Section: Resultssupporting

confidence: 83%

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

et al. 2015

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“…As a result, the oxygen octahedra around the Mn ions become more distorted, appearing as tilted structures that lean against each other, similar to zigzag chains. 12 To calculate the tolerance factor values in the present study, the coordination numbers of the A-site ion, B-site ion, and O ion (1.40 Å , 6-coordinated) were set to 12, 6, and 6, respectively. In addition, Shannon's ionic radii were used in this study for the calculation of the tolerance factors.…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric Properties of the Ca1−x R x MnO3 Perovskite System (R: Pr, Nd, Sm) for High-Temperature Applications

Choi

Lim

Seo

2010

Journal of Elec Materi

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Perovskite oxides have attracted considerable attention in the area of thermoelectrics owing to the advantages of their isotropic crystal structure and straightforward control of their electrical properties. Among the many perovskites, different types of polycrystalline Ca 1Àx R x MnO 3 (R: Pr, Nd, Sm) were prepared by solid-state reaction in this study. Three different rare-earth dopants were substituted at the Ca-ion site at various amounts. Considering phase stability, rare-earth ions with nearly the same ionic radius as Ca 2+ were selected. To assess thermoelectric performance, the electrical conductivity, Seebeck coefficient, and power factor were measured, and phase analysis was conducted. The effects of ionic radius variation on single phase formation and the effect of doping amount on carrier concentration are discussed.

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“…A polycrystalline oxide of (Sr 0.67 Sm 0.33 )(Mn 0.33 Ti 0.67 )O 3 was synthesized by a solid‐state reaction method. Starting materials (Ln 2 O 3 , SrCO 3 , Mn 2 O 3 , and TiO 2 ) with 99.9% or better purity were used, and were pre‐treated by heating to adjust the oxidation state of these ions 15 . Each of the pretreated reagents was weighed and then mixed together, and the mixture was pressed into pellets.…”

Section: Methodsmentioning

confidence: 99%

“…The role of the tetravalent ion was clarified from the relationship between the average (Mn,Ti)–O distance and the electrical properties 13 . Recently, the present authors synthesized oxides with various structures in an Ar flow including (Ca 0.5 La 0.5 )(Mn 0.5 Ti 0.5 )O 3 possessing a cubic structure (), (Sr 0.5 La 0.5 )(Mn 0.5 Ti 0.5 )O 3 with a rhombohedral structure (), and (Ca 0.5 Ln 0.5 )(Mn 0.5 Ti 0.5 )O 3 (Ln=La, Nd, Eu) and (Ca 0.5 Ln 0.5 )(Mn 0.33 Ti 0.67 ) (Ln=Y, Gd, Dy, Ho, Yb) with orthorhombic structures ( Pnma ) 14,15 …”

Section: Introductionmentioning

confidence: 99%

Nano‐Domain Twin Structure Formed by Phase Transition in New Perovskite Oxide (Sr_0.67Sm_0.33)(Mn_0.33Ti_0.67)O₃

Nakano

Kobayashi

Kamegashira

2007

Journal of the American Ceramic Society

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A new perovskite oxide, (Sr0.67Sm0.33)(Mn0.33Ti0.67)O3, was synthesized at 1573 K in an Ar flow. The structure of the oxide was determined to be orthorhombic with the space group of Pnma using X‐ray diffraction and electron diffraction. High‐resolution transmission electron microscope (HRTEM) images of the oxide revealed that nano‐domain structures were formed by twinning due to a phase transition. This is the first time that phase transition of the oxide has been observed in situ using a heating stage in a TEM. The high‐temperature phase possessed an orthorhombic structure with the space group of Imma, which appeared above 723 K.

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Synthesis and crystal structure of (Ca, R)(Mn, Ti)O3 (R, rare earth)

Cited by 13 publications

References 9 publications

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

Thermoelectric Properties of the Ca1−x R x MnO3 Perovskite System (R: Pr, Nd, Sm) for High-Temperature Applications

Nano‐Domain Twin Structure Formed by Phase Transition in New Perovskite Oxide (Sr_0.67Sm_0.33)(Mn_0.33Ti_0.67)O₃

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Synthesis and crystal structure of (Ca, R)(Mn, Ti)O3 (R, rare earth)

Cited by 13 publications

References 9 publications

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

Thermoelectric Properties of the Ca1−x R x MnO3 Perovskite System (R: Pr, Nd, Sm) for High-Temperature Applications

Nano‐Domain Twin Structure Formed by Phase Transition in New Perovskite Oxide (Sr0.67Sm0.33)(Mn0.33Ti0.67)O3

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Nano‐Domain Twin Structure Formed by Phase Transition in New Perovskite Oxide (Sr_0.67Sm_0.33)(Mn_0.33Ti_0.67)O₃