No abstract available

[en] Infrared absorption spectra of Ba, Sr, Ca, Mg, Be metaphosphates in crystal and glass-like states are studied. Reference of absorption bands to the oscillations of the P=O, P-O^- bonds and P-O-P bridges in complex anions is made. It is shown that α-Sr(PO₃)₂, β-Ca(PO₃)₀ and Be(PO₃)₂ are built of the [(POOsup(-)Osub(2/2))sub(4)] sub(infinity) chains of the C₁ symmetry. According to spectral data calculated are the main characteristics of the P=o and P-O^- bonds (force constants, bond order, interatomic distances). The main structural elements of glass-like metaphosphates are distorted (POO-Osub(2/2)) sub(infinity) chains connected in three-dimentional net

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[en] After attacking the beryl by fusing the powdered mineral with sodium peroxide and eliminating silica, beryllium is precipitated directly in the filtrate by monoammonium phosphate in the presence of Complexon II or ethylene diamino-tetra-acetic acid. Complexon II forms complexes and retains in the solution the other metals contained in beryl, but permits the quantitative precipitation of ammonium phosphate and beryllium which is calcined at 1000 deg. and weighed out as beryllium pyrophosphate, Be₂P₂O₇. Reprint of a paper published in 'Analytica Chimica Acta', vol. 7, no. 6, Jun 1952, p. 37-41.

[en] The process of thermal dissociation of beryllium polyphosphate has been treated by high temperature mass spectroscopy. Partial pressure of P₄O₁₀ vapor over Be(PO₃)₂ was measured, heat of dissociation was determined

[en] The iron-rich variety of zanazziite Ca₂[Mg_0.65Fe_0.35□_1.0][Mg_1.90Fe_1.25Al_0.5Mn_0.35]_Σ4Be₄(PO₄)₆(OH)₄(H₂O,OH)₂ . 4H₂O, which is a heteropolyhedral framework roscherite-group beryllophos-phate from the Sapucaia pegmatite (Minas Gerais, Brazil), was studied by X-ray diffraction. The refinement was carried out in the triclinic and monoclinic systems. It was found that the cation distribution on octahedral sites in the crystal structure is in better agreement with the monoclinic symmetry (a = 15.876 A, b = 11.860 A, c = 6.607 A, β = 95.49^o, sp. gr. C2/c). In the sample under study, no ordering of Mg or Fe atoms in octahedral sites is observed in sp. gr. P1-bar, unlike the more iron-rich member of the roscherite group (atencioite).

[en] The first uranyl beryllophosphate, [(UO₂)₂{Be(H₂O)₂(PO₄)₂}].(H₂O), has been synthesized under hydrothermal conditions at 200 C. The monoclinic unit-cell parameters are: a=9.3361(1), b=8.8545(4), c=9.6592(10) Aa, β=93.211(1) , V=797.21(6) Aa³, space group P2/n, Z=2. The crystal structure has been solved by direct methods and refined to final R₁=4.92% using 1294 I>3σ(I) reflections in the anisotropic approximation. The structure consists of sheets of UrO₅ pentagonal bipyramids and PO₄ tetrahedra. UrO₅ bipyramids are linked by edge-sharing to form infinite chains. Adjacent chains of UrO₅ bipyramids are connected by sharing alternating edges of uranyl bipyramids with PO₄ tetrahedra. The resulting sheets are based on the well-known uranophane anion-topology. Be atoms are tetrahedrally coordinated by two oxygen atoms of PO₄ tetrahedra and two water molecules in the interlayer space. One isolated water molecule also occurs in the interlayer space, where it is held in position by H bonds. The connection between the phosphorus and beryllium tetrahedra leads to formation of an unbranched trimer [BeP₂O₈(H₂O)₂]^4- observed for the first time in inorganic oxysalts.

[en] A lithium-beryllium-substituted fluorapatite, Li_0.50Be_0.25Ca_4.50(PO₄)₃F, has been prepared by means of a high-temperature reaction between lithium beryllium fluoride, Li₂BeF₄, and tricalcium phosphate, Ca₃(PO₄)₂. This material has potential application as a waste form for radioactive and toxic fluoride salts. Monitoring of the reaction progress by differential scanning calorimetry indicated that the reaction was initiated by melting of the fluoride salt and that it was fast and complete. While reactive sintering of lithium beryllium fluoride with tricalcium phosphate led to a rather porous product, melting of the reactants with subsequent solidification readily produced a substituted fluorapatite with a near-theoretical bulk density

[en] Gas-phase reactions with the participation of beryllium phosphates and calcium, strontium and barium beryllates are studied by mass spectroscopy. Standard enthalpies of formation and atomization of gaseous salts BePO₃, BePO₂, CaBeO₂, SrBeO₂ and BaBeO₂ are determined. High correlation coefficient (0.9987) and low standard deviation (34.6) are testimony to reliability of the obtained results

[en] Consideration is given to results of investigation of spectra and fast kinetics of luminescence damping of lithium and barium beryllium-phosphate glasses (BPG) under pulsed excitation by synchrotron radiation (SR). Influence of density of excitation by SR on BPG luminescence was studied. Short components of kinetics of BPG luminescence damping were revealed