China
Africa
Explore chapters and articles related to this topic
Systems Based on AlP
Published in Vasyl Tomashyk, Multinary Alloys Based on III-V Semiconductors, 2018
Al3(PO4)2(OH,F)3·5H2O (mineral wavellite) also crystallizes in the orthorhombic structure with the lattice parameters a = 964.22 ± 0.07, b = 1,741.46 ± 0.15, and c = 700.94 ± 0.02 pm and a calculated density of 2.459 g cm−3 (Capitelli et al. 2014a) [a = 960, b = 1,731, and c = 698 pm and the calculated and experimental densities of 2.365 and 2.36 g cm−3, respectively (Gordon 1950); a = 962.1 ± 0.2, b = 1,736.3 ± 0.4, and c = 699.4 ± 0.3 pm (Araki and Zoltai 1968); a = 960.4, b = 1,735.6, and c = 700.9 pm (Blanchard 1974)].
Systems Based on AlP
Published in Vasyl Tomashyk, Quaternary Alloys Based on III-V Semiconductors, 2018
Al3(PO4)2(OH)3·(4.5–5)H2O (mineral wavellite) crystallizes in the orthorhombic structure with the lattice parameters a = 962.1 ± 0.2, b = 1736.3 ± 0.4, and c = 699.4 ± 0.3 pm (Araki and Zoltai 1968). According to the data by Gordon (1950), the formula of this mineral is Al3(PO4)2(OH,F)3·5H2O.
Enrichment of primary macronutrients in biochar for sustainable agriculture: A review
Published in Critical Reviews in Environmental Science and Technology, 2022
Adnan Asad Karim, Manish Kumar, Ekta Singh, Aman Kumar, Sunil Kumar, Arati Ray, Nabin Kumar Dhal
Transformation of P in biochars derived from peanut husk, wheat and maize straw through slow pyrolysis (300–600 °C) was studied by Xu, Zhang, Shao, and Sun (2016). Water-soluble P forms are dominant in biochars produced at low temperature (up to 400 °C), which are transformed into more labile form (400 to 600 °C) and ultimately to stable form with increasing pyrolysis temperature (600 to 800 °C). During pyrolysis, above 200 °C organic P (ortho-monoester) fractions changed into inorganic forms (Ortho and Pyro-phosphate). Sodium pyro-phosphate (Na4P2O7) and monetite (CaHPO4) were major species present in biochars, whose proportions increased with pyrolysis temperature. The other stable minor forms of P in biochars as detected by Solid state 31P NMR are Crandallite (CaAl3(OH)5(PO4)2), Wavellite (Al3(OH)3(PO4)2·5H2O), Hydroxyapatite [Ca5(PO4)3OH], Sodium pyro-phosphates [Na2H2P2O7], Tri-sodium di-phosphate [Na3HP2O7], Senegalite [Al2(OH)3(PO4)·H2O], Variscite (AlPO4·2H2O), Di-calcium phosphate dihydrate (CaHPO4·2H2O).
A review of the geological settings, ages and economic potentials of carbonatites in the Democratic Republic of Congo
Published in Applied Earth Science, 2021
Georges M. Kasay, Anthony T. Bolarinwa, Olawale K. Aromolaran, Charles Nzolang, Vikandy S. Mambo
The petrography of the Lueshe massifs was described for the first time by De Bethune and Meyer (1956). Meyer and De Bethune (1958) later gave details of the compositions of the carbonatites, syenites and fenites. Other workers focused on the petrography, petrology and geology of the Lueshe Complex (Maravic and Morteani 1980; Maravic et al. 1989; Nasraoui 1996; Kramm et al. 1997). The rock types of Lueshe Complex are presented in Figure 2. They include syenite, carbonatite, fenite, mica schist, quartzite and pyroxenitic rocks. These rocks are covered by thick lateritic soils of between 30 and 150 m. The Busoro and Mutoro Hills are deeply weathered and covered with thick laterites rich in clay and sand minerals. Clay minerals are dominated by kaolinite and montmorillonite. Laterites are also enriched in crandallite, goethite, goyacite, wavellite, florencite, psilomelane and cryptomelane. - Syenites