Metallically functional materials with unique negative thermal expansion(NTE)or magnetocaloric effect(MCE)are promising in applications.Herein,we report the coexistence and coupling of NTE and MCE in(Gd,Ho)(Co,Fe)_(2)...Metallically functional materials with unique negative thermal expansion(NTE)or magnetocaloric effect(MCE)are promising in applications.Herein,we report the coexistence and coupling of NTE and MCE in(Gd,Ho)(Co,Fe)_(2)intermetallic compounds.展开更多
The mechanism of the precursor dehydration route was revealed for the synthesis of NTE c-ZrW_ 1.6 Mo_ 0.4 O_8. The hydrate precursor was dehydrated at 473 K and transformed to a NTE cubic compound above 800 K. A nov...The mechanism of the precursor dehydration route was revealed for the synthesis of NTE c-ZrW_ 1.6 Mo_ 0.4 O_8. The hydrate precursor was dehydrated at 473 K and transformed to a NTE cubic compound above 800 K. A novel intermediate phase o-ZrW_ 1.6 Mo_ 0.4 O_8 occurs between the temperature range of 573—800 K. The XRD pattern of novel intermediate was refined with the structural model of LT-ZrMo_2O_8 by using Rietveld method. The residuals are R_ wp =7.80% and R_p=5.79%. The space group is Pmn2_1 and the lattice parameters are a=0.5917(4) nm, b=0.7273(4) nm, c=0.9148(6) nm, and Z=2.展开更多
基金supported by the National Natural Science Foundation of China(21701008,21731001,21590793)The synchrotron radiation experiments were performed at the BL44B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute(JASRI)(Proposal No.2018A1210,2018B1515)The neutron powder diffraction experiments at NOVA and iMATERIA of the J-PARC were performed under a user program(Proposal No.2018A0295,2018B0124 and 2018B0143)。
文摘Metallically functional materials with unique negative thermal expansion(NTE)or magnetocaloric effect(MCE)are promising in applications.Herein,we report the coexistence and coupling of NTE and MCE in(Gd,Ho)(Co,Fe)_(2)intermetallic compounds.
基金ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No .2 98710 0 6)
文摘The mechanism of the precursor dehydration route was revealed for the synthesis of NTE c-ZrW_ 1.6 Mo_ 0.4 O_8. The hydrate precursor was dehydrated at 473 K and transformed to a NTE cubic compound above 800 K. A novel intermediate phase o-ZrW_ 1.6 Mo_ 0.4 O_8 occurs between the temperature range of 573—800 K. The XRD pattern of novel intermediate was refined with the structural model of LT-ZrMo_2O_8 by using Rietveld method. The residuals are R_ wp =7.80% and R_p=5.79%. The space group is Pmn2_1 and the lattice parameters are a=0.5917(4) nm, b=0.7273(4) nm, c=0.9148(6) nm, and Z=2.
