Another unusual phenomenon for Zr7Ni10: structural change in hydrogen solid solution and its conditions

Takeshita, Hideki; Fujiwara, Nobuaki; Oishi, Takao; Noréus, Dag; Takeichi, Nobuhiko; Kuriyama, Nobuhiro

doi:10.1016/s0925-8388(03)00358-x

Cited by 17 publications

(23 citation statements)

References 7 publications

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“…The other two interesting information explored from this comparison is that (a) the phase abundance of C14 appears to increase during hydrogenation of both the ZrMnNi, ZrMn 0.75 Ni 1.25 samples. It can be understood from the appearance of some dominant peaks of C14 after hydrogenation, (b) the non-laves phase Zr 7 Ni 10 which presents along with the ZrMn 0.75 Ni 1.25 sample also gets hydrogenated and its usual orthorhombic phase itself undergoes phase transformation [24,25]. Unlike the above two cases, in the case of ZrMn 0.5 Ni 1.5 (Fig.…”

Section: Resultsmentioning

confidence: 91%

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Kumar

Pukazhselvan

Tyagi

et al. 2013

Mater Renew Sustain Energy

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The present communication reports the hydrogen storage characteristics of ZrMn 2-x Ni x laves phase hydrides. It is observed that promising hydrogen storage materials can be tailored when ''x'' is in the range of 1.5 B x C 1. The materials formed within this range reversibly store *2 to *3 H/F.U. under manageable operating conditions. The composition ZrMn 0.5 Ni 1.5 is found to absorb and desorb hydrogen under room temperature. The other two compositions ZrMn 0.75 Ni 1.25 and ZrMnNi absorb *3.6 H/F.U. and release *3 and *3.2 H/F.U., respectively. In each case, almost half of the effective storage capacity of total can be reversibly stored within 5 s under room temperature. Therefore, the materials falling within the range of 1.5 B x C 1 are promising candidates for stationary device applications. The correlation between the compositions, structural-microstructural features and thermodynamic data are presented.

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Section: Resultsmentioning

confidence: 91%

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Kumar

Pukazhselvan

Tyagi

et al. 2013

Mater Renew Sustain Energy

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show abstract

“…Assuming such a possibility, i.e., plausible substitution of Ti for Zr in the compounds, the composition of the high-temperature B2 phase could average between (Ti,Zr) 7 (Ni,TM) 10 and (Ti,Zr) 9 (Ni,TM) 11 , as shown schematically in Figure 18(b) (ratio of (Ni,TM)/(Ti,Zr): 1.43(Zr 7 Ni 10 )>1.27(HT-B2)>1.22(Zr 9 Ni 11 )). Thus, the formation of both Zr 7 Ni 10 -type and Zr 9 Ni 11 -type phases is required to balance the composition of interdendritic grains, with the possibility that a residual, quenched-in B2 phase could also persist.…”

Section: Discussionmentioning

confidence: 99%

“…[9] The metastable tetragonal structure of Zr 7 Ni 10 with space group I4/mmm was shown to form after dehydrogenation of its corresponding hydride or by rapid melt quenching. [10,11] The dominating crystal structure of Ti x Zr 7-x Ni 10 (x between 0 and 2.5) is also orthorhombic before and turns into tetragonal after hydrogenation. [12] With a small amount of vanadium included, the alloy Ti 1.5 Zr 5.5 V 0.5 Ni 9.5 is still dominated by the orthorhombic Zr 7 Ni 10 structure.…”

Section: Introductionmentioning

confidence: 99%

Examination of Multiphase (Zr,Ti)(V,Cr,Mn,Ni)2 Ni-MH Electrode Alloys: Part II. Solid-State Transformation of the Interdendritic B2 Phase

Bendersky

Wang

Boettinger

et al. 2010

Metall Mater Trans A

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Solidification microstructure of multicomponent (Zr,Ti)-Ni-(V,Cr,Mn,Co) alloys intended for use as negative electrodes in Ni-metal hydride (Ni-MH) batteries was studied in Part I of this series of articles. Part II of the series examines the complex internal structure of the interdendritic grains formed by solid-state transformation and believed to play an important role in the electrochemical charge/discharge characteristics of the overall alloy composition. By studying one alloy, Zr 21 Ti 12.5 V 10 Cr 5.5 Mn 5.1 Co 5.0 Ni 40.2 Al 0.5 Sn 0.3 , it is shown that the interdendritic grains solidify as a B2 (Ti,Zr) 44 (Ni,TM) 56 phase, and then undergo transformation to Zr 7 Ni 10 -type, Zr 9 Ni 11 -type, and martensitic phases. The transformations obey orientation relationships between the high-temperature B2 phase and the low-temperature Zr-Ni-type intermetallics, and consequently lead to a multivariant structure. The major orientation relationship for the orthorhombic Zr 7 Ni 10 type is [011] Zr7Ni10 //[001] B2 ; (100) Zr7Ni10 //(100) B2 . The orientation relationship for the tetragonal Zr 9 Ni 11 type is [001] Zr9Ni11 //[001] B2 ; (130) Zr9Ni11 //(100) B2 . Binary NiZr and ternary Ti-Ni-Zr phase diagrams were used to rationalize the formation of the observed domain structure.

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“…However, this phenomenon is not observed in ZN0710. Moreover, from the same standpoint, the unit cell volume of orthorhombic Zr 7 Ni 10 is larger than that of tetragonal Zr 7 Ni 10 [38,45]. Therefore, the smaller unit cell of tetragonal Zr 7 Ni 10 in ZN0710A promotes a better reversible storage capacity compared to ZN0710.…”

Section: Gaseous Phase Pct Analysismentioning

confidence: 99%

Gaseous phase hydrogen storage and electrochemical properties of Zr8Ni21, Zr7Ni10, Zr9Ni11, and ZrNi metal hydride alloys

Nei

Young

Regmi

et al. 2012

International Journal of Hydrogen Energy

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Another unusual phenomenon for Zr7Ni10: structural change in hydrogen solid solution and its conditions

Cited by 17 publications

References 7 publications

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Effect of Ni concentration on the structural and hydrogen storage characteristics of Zr–Mn based laves phase system

Examination of Multiphase (Zr,Ti)(V,Cr,Mn,Ni)2 Ni-MH Electrode Alloys: Part II. Solid-State Transformation of the Interdendritic B2 Phase

Gaseous phase hydrogen storage and electrochemical properties of Zr8Ni21, Zr7Ni10, Zr9Ni11, and ZrNi metal hydride alloys

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