Authors:E. Radomińska, T. Znamierowska and W. Szuszkiewicz
In the present article, the results of investigations pertaining to the equilibria which occur in the system Rb 3 PO 4 –Ba 3 (PO 4 ) 2 are described. Its phase diagram was not published previously. There is
Authors:Wenwei Wu, Xuehang Wu, Shuibin Lai and Sen Liao
functionalized materials [ 1 – 4 ]. Zirconium phosphates are an important class of polyvalent metal compounds that occur in two basic forms: α- and γ-zirconium phosphates (α-ZrP and γ-ZrP) represented by the formulae Zr(HPO 4 ) 2 ·H 2 O and Zr(PO 4 )(H 2 PO 4 )·2
Authors:Taťána Fenclová, Zdeněk Jonšta, Miroslav Hnatko, Josef Kraxner and Pavol Šajgalík
bioapplication of silicon nitride.
This paper deals with the characterization of Si 3 N 4 microspheres (prepared by flame synthesis) with the addition of a bioactive component in the form of Ca 3 (PO 4 ) 2 in terms of their structure and biological
Authors:M. Chromčíková, M. Rodová, K. Nitsch and M. Liška
relaxation of Ce-doped Na–Gd phosphate glass with nominal composition of NaGd(PO 3 ) 4 and its aim is to describe structural relaxation of this glass by the Tool–Narayanaswamy–Mazurin (TNMa) model. In order to determine material constants and the model
Fuel cells operative at intermediate-temperature (IT) are attractive power generation systems from the aspect of energy conversion efficiency. Recently, solid acid fuel cells employing CsHSO 4 and CsH 2 PO 4 as
Authors:Hrudananda Jena, R. Venkata Krishnan, R. Asuvathraman, K. Nagarajan and K. V. Govindan Kutty
are naturally occurring minerals having hexagonal crystal structure (space group P 6 3 /m) with unit cell formula M 5 (PO 4 ) 3 (X), M = Li, Na, Ca, Sr, Ba, rare earth and (X = OH, Cl or F) [ 2 – 6 ]. These apatites can be host matrices for
Authors:Ray L. Frost, Sara J. Palmer and Ross E. Pogson
The mineral newberyite Mg(PO 3 OH)·3H 2 O is a mineral that has been found in Australian caves such as the Skipton Lava Tubes and the Petrogale Cave. However, newberyite has been found in many sites worldwide [ 1
A method for determining210Po in marine samples by wet dissolution, deposition onto silver disc and counting by -spectrometry is described. Recovery of polonium was obtained with208Po tracer.210Po levels in fish from the Brazilian coast and sediments from Antarctic region were determined. Levels in fish ranged from 0.5 to 5.3 Bq·kg–1 wet and for sediments, mean values of 10 mBq·kg–1 were obtained.
A method for isolation and electroplating of210Po is described. Natural samples of autunite, after pretreatment, were dissolved in dilute hydrochloric acid and the solution was passed through a chromatographic partition column with di (2-ethylhexyl) phosphoric acid as stationary phase. Uranium and its daughters were strongly retained in the column. The210Po fraction was eluted with citric acid solution, then evaporated almost to dryness. Next, electroplating was carried out for 18 h, at 5–10 mA current, using an electrolyte bath of oxalic acid solution. The yield of recovery of radiochemically pure210Po was about 95% of the initial210Po activity.
The mineral stercorite originated from the Petrogale Cave, Madura, Eucla, Western Australia. Many minerals may form in these caves, some of which include archerite (K, NH 4 )(H 2 PO 4 ) [ 1 ], and mundrabillaite