Nanostructured HoFeO3 powders were obtained by solution combustion method at various glycine-nitrate ratios (G/N =0.2,0.4… 1.4).According to X-ray powder diffractometry data,the presence of two modifications of HoFeO3 in the synthesized samples was established:orthorhombic (Pbnm) and hexagonal (P63/mmc).The crystallite size of the obtained compositions varies from 62 ± 6 to 29 ± 3 nm,depending on the G/N ratio.From magnetic structure studies,it is found that HoFeO3 obtained with a stoichiometric amount of glycine in the reaction solution is in the magnetically ordered state and is represented by a sextet with quadrupole splitting (QS) =0 mm/s,isomeric shift (IS) =0.36 mm/s and effective field strength (Heff) =497 kOe.According to the results of vibrational magnetometry,it is found that the orthoferrites obtained have a ferromagnetic structure,the main parameters of which (Ms,Mr and Hc) systematically change with a change in the redox ratio of the reaction mixture and,as a consequence,their phase composition,and reach maximum values at a G/N ratio =0.6.In the samples obtained with a significant excess and lack of glycine (G/N-0.2 and 1.4),despite their amorphous nature,hysteresis loops characteristic of the ferromagnetic state of the substance is observed.It is hopeful to obtain a pure hexagonal modification of HoFeO3 via heat treatment on amorphous products of glycine-nitrate combustion.

K.D.Martinson;I.S.Kondrashkova;M.I.Chebanenko;A.S.Kiselev;T.Yu Kiseleva;V.I.Popkov

Ioffe Institute,26 Politeknicheskaya,St.Petersburg,194021,Russia;Saint Petersburg State Institute of Technology,26 Moskovsky,St.Petersburg,190013,Russia;Faculty of Physics,M.V.Lomonosov State University,Leninskie Gory,Moscow,119991,Russia

稀土学报（英文版）

[1]K.D.Martinson;I.S.Kondrashkova;M.I.Chebanenko;A.S.Kiselev;T.Yu Kiseleva;V.I.Popkov-.Morphology,structure and magnetic behavior of orthorhombic and hexagonal HoFeO3 synthesized via solution combustion approach)[J].稀土学报（英文版）,2022(02):296-301

HoFeO3,sextet,Heff,orthoferrites

Morphology,behavior,orthorhombic,hexagonal,synthesized,via,solution,combustion,approach,Nanostructured,powders,were,obtained,by,method,various,glycine,nitrate,ratios,According,ray,diffractometry,data,presence,two,modifications,samples,was,established,Pbnm,P63,mmc,crystallite,compositions,varies,from,depending,From,studies,found,that,stoichiometric,amount,reaction,magnetically,ordered,state,represented,quadrupole,splitting,QS,isomeric,shift,IS,effective,field,strength,kOe,results,vibrational,magnetometry,have,ferromagnetic,main,parameters,which,Ms,Mr,Hc,systematically,change,redox,mixture,consequence,their,phase,reach,maximum,values,In,significant,excess,lack,despite,amorphous,nature,hysteresis,loops,characteristic,substance,observed,It,hopeful,pure,heat,treatment,products

0.54242