Pseudo-isostructure

RB50 forms for the rare earth elements of Tb, Dy, Y, Ho, Er, Tm, Yb, and Lu. As will be noted later, it was also discovered that addition of Si which creates the pseudo-isostructural RB44Si2 compound enables the realization of the Gd phase. 

Iron metaniobates(iv) with structures of the natural minerals, ilmenite and pseudo-brookite have been prepared by direct reaction of the oxides under vacuum at 1000—1100°C. The compounds are stable in air up to 500°C, but are oxidized at higher temperatures.326 a-Sr3Fe07 x has been found to be isostructural with Sr3Ti07.327 Synthesis and thermal decomposition of iron(m) normal selenite mono-or tri-hydrate, Fe203,3Se02,xH20 (x = 1 or 3) have been reported.328... 

The compounds RSHgX (R = Me, Et, Pr, Bu X = Q, Br, I) have been studied by vibrational spectrometry. The species MeSHgX (X = Cl, Br) are isostructural with a polymeric structure in which the mercury is in a pseudo-octahedral environment. IR and Raman measurements on a series of RSHgX have demonstrated the formation of a range of monomeric, dimeric and polymeric structures in the solid state, but they also have established the compounds to be monomeric in pyridine solution. In pyridine solution the equilibrium... 

Elthon D, 1983, Isomolar and isostructural pseudo-liquidus phase diagrams for oceanic basalts. Amer. Mineral., 68, 506-511. 

As a fundamental class of compounds in the fields of synthetic solid-state (and also molecular) chemistry, cyanamides and carbodiimides have gained increasing attention within the past decade. Because of their 2-fold anionic charge, both cyanamide and carbodiimide structural units allow the realization of nitrogen-based pseudo-oxide chemistry since NCN is able to replace in a wide variety of novel materials. A number of alkali metal, alkaline-earth metal, main-group metal,divalent transition-metal, trivalent rare-earth metal,and also triva-lent transition-metal cyanamides/carbodiimides were obtained following different synthetic routes. The only carbodiimide containing divalent lanthanide ions was reported by DiSalvo et al., who found that EuNCN is isostructural to the already known a-SrNCN. ... 

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