Synthesis and Rietveld analysis of Zn4−xCdxSb3 bulk crystals in the Zn-rich region

Souma, Takeshi; Ohtaki, Michitaka

doi:10.1016/j.jallcom.2005.06.062

Cited by 17 publications

(11 citation statements)

References 14 publications

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“…Moreover, the density of the BZT solid solution decreases as the Zr content increases, as seen in Table II. Souma and Ohtaki [15] have demonstrated that the density of the bulk crystal estimated by the Rietveld method is very close to the measured value. The higher the density, the lower the vacancy or void in the ceramics, resulting in both a higher dielectric constant and a lower Curie temperature.…”

Section: A the Structure Of Bzt Ceramicssupporting

confidence: 54%

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Huang

Chiu

et al. 2008

Metall Mater Trans A

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Ti 12x )O 3 (x = 0, 0.05, 0.1, and 0.15, BZT for short) has been prepared using the solid solution reaction from BaTiO 3 (BT) and BaZrO 3 (BZ). For transmission electron microscopy (TEM) analysis, the cubic phase of BZT coexists with the tetragonal one in the Ba(Zr 0.15 Ti 0.85 )O 3 ceramics. Its structure of ceramics has been estimated using the Rietveld and Cohen methods. The effect of BaZrO 3 content on the tetragonality of BZT and its relation to a dielectric constant have been studied, and it is found that the tetragonality approaches 1 as the BZ content is increased, while simultaneously the Curie temperature of BZT decreases at a rate of 4.66°C per mole pct BZ. The average grain size was sensitive to the BZ content, and the P r could be enhanced at room temperature.

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Section: A the Structure Of Bzt Ceramicssupporting

confidence: 54%

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Huang

Chiu

et al. 2008

Metall Mater Trans A

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“…Many investigations have been carried out on the properties of Cd 4 Sb 3 , which has an analogous structure to Zn 4 Sb 3 . , There has been some discussion about the solid-solution range of Cd 4 Sb 3 −Zn 4 Sb 3 . Record et al found the solubility of Cd in Zn 4 Sb 3 to be ∼43 at %, giving a maximum formal stoichiometry of Zn 2.28 Cd 1.72 Sb 3 , whereas Nakamoto et al reported a maximum Cd stoichiometry of Zn 2.4 Cd 1.6 Sb 3 . , A solubility of 50 at % has also been reported by Ohtaki et al using the vacuum casting method without annealing . However, a study by Kuznetsov et al showed a maximum Cd stoichiometry of only Zn 3.76 Cd 0.24 Sb 3 .…”

Section: Introductionmentioning

confidence: 90%

Cd Substitution in M_xZn_4−-xSb₃: Effect on Thermal Stability, Crystal Structure, Phase Transitions, and Thermoelectric Performance

et al. 2010

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The effects of Cd substitution in M x Zn4−x Sb3 on the high-temperature thermal stability, low-temperature phase transitions and thermoelectric properties have been studied on three samples with a substitution degree of 0.1, 1, and 2 at % Cd (x = 0.004, 0.04, 0.08). The high-temperature thermal stability in atmospheric air of a 1% substituted sample is compared with an unsubstituted Zn4Sb3 sample. Multitemperature synchrotron powder diffraction data reveals that while only ∼42 wt % of the original Zn4Sb3 phase remains in the unsubstituted sample after three heating cycles to 625 K, 78 wt % is preserved in the Cd-substituted sample. Thus, Cd-substitution provides a significant improvement of the thermal stability of Zn4Sb3. Multitemperature synchrotron powder diffraction data measured between 90 and 300 K reveal that Cd substitution has a suppressing effect on the α′−α−β phase transitions. With increasing substitution, there is also a significant change in the individual Zn site occupancies. Differential scanning calorimetry shows an apparent correlation between Cd content and phase transition temperature. Thermoelectric properties have been measured from 2 to 400 K for all samples, and although some physical properties are significantly affected by doping, no immediate improvement of ZT was achieved.

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“…These suggest that the calculated pattern for the δ-Ni 2 Si is in good agreement with the measured results. This is supported by the fact that the indicator of the accuracy of the Rietveld fitting, S, was 1.64, thus indicating that the Rietveld analysis had a high level of reliability [26]. We can therefore conclude that the DPs were identified as being δ-Ni 2 Si, i.e., both the CPs and DPs have the same crystal structure.…”

Section: Characterization Of Dpsmentioning

confidence: 63%

Discontinuous precipitates in age-hardening CuNiSi alloys

Semboshi

Sato

Iwase

et al. 2016

Materials Characterization

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Synthesis and Rietveld analysis of Zn4−xCdxSb3 bulk crystals in the Zn-rich region

Cited by 17 publications

References 14 publications

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Cd Substitution in M_xZn_4−-xSb₃: Effect on Thermal Stability, Crystal Structure, Phase Transitions, and Thermoelectric Performance

Discontinuous precipitates in age-hardening CuNiSi alloys

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Synthesis and Rietveld analysis of Zn4−xCdxSb3 bulk crystals in the Zn-rich region

Cited by 17 publications

References 14 publications

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Cd Substitution in MxZn4−-xSb3: Effect on Thermal Stability, Crystal Structure, Phase Transitions, and Thermoelectric Performance

Discontinuous precipitates in age-hardening CuNiSi alloys

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Product

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Cd Substitution in M_xZn_4−-xSb₃: Effect on Thermal Stability, Crystal Structure, Phase Transitions, and Thermoelectric Performance