[en] Formation of individual congruently melting at 1205 deg C chemical compound of 2CdWO₄·Ho₂(WO₄)₃ composition, crystallizing in tetragonal syngony (sheelite structural type, sp.gr. I 4_1/a was established in CdWO₄-Ho₂(WO₄)₃ system. The region of existence of solid solutions on the basis of holmium tungstate, crystallizing in rhombic syngony (structural type of scandium tungstate, sp.gr. P_nca), was also revealed in the system. Concentration range of solid solution formation doesn't exceed ≅6% at 1100 deg C

[en] Complex hafnium-containing niobates of CdLnHfNbO₇ composition were synthesized and investigated. It was established that realized phases crystallized in two structural types depending on the type of rare earths: compounds, containing rare earths from La to Dy, crystallize in pyrochlore structural type (cubic syngony, sp. gr. Fd3m); compounds including rare earths from Ho to Lu - in fluorite structural type (cubic syngony, sp. gr. Fm3m). Main physicochemical characteristics of synthesized compounds were determined

[en] Short note

[en] Study of the solidphase interaction of the second group D.I. Mendeleev Periodic System metal oxide with lead dioxide by roentgenophase analysis showed that MeO-PbO₂ systems could be divided into two groups, depending on the interaction character: 1 systems with absence of the interaction between the initial components-MgO(ZnO,CdO)-PbO₂; 2/systems, in which formation of the lead compounds takes place-CaO(SrO,BaO-PbO₂). It was shown that the tendency to the formation of the compounds in the MeO-MeO₂ systems was determined by correlation of the crystalchemical characteristics (ion radius, ion potential) of the cations Me²⁺ and Me⁴⁺

[en] Short communication

No abstract available

[en] Short note

[en] Short note

[en] Formation of three main phases including: CdMoO₄ base solid solutions crystallized in the structural type of scheelite, their formation interval 20% of Ho₂[MoO₄]₃ at 050 deg C; solid solutions with the structure, related to lscheelite, but undergoing a monoclinic distortion and crystallized within 33-48% Ho₂[MoO₄]₃ molar concentration interval; holmium molybdate base solid solutions with the extent area of up to 8% of CdMoO₄, is ascertained in CdMoO₄-Ho₂[MoO₄]₃ system. An equilibrium phase diagram of the system under investigation in proposed

[en] The constitutional diagram of the CdMoO₄-Cd₂(MoO₄)₃ system has been plotted using statistical and dynamic methods as well as a complex of instrumental analysis procedures. Three major phases have been found to occur in the systems, viz.: CdMoO₄ based solid solutions that crystallize in the range from 0 to 25 mol.percent of Cd₂(MoO₄)₃ and pass in transit the two-phase narrow region becoming then solid solutions having a distorted scheelite structure and existing in concentrations from 40 to 65 mol.% of Cd₂(MoO₄)₃. The entire range, in which the Cd₂(MoO₄)₃ solid solutions can exist, amounts to less than 5 mol.%. Certain crystallochemical constants of the phases that occur in the system have been determined