[en] The composite of Agl₀.5(Al₂O₃)₀.5 has been prepared via solid state reaction, by mixing of Agl with β-Al₂O₃ powders. The mixture was compacted with diametre 1.5 cm and pressure 5 ton. The composite of Agl₀.5(Al₂O₃)₀.5 was irradiated with the value of 10 kGy, and 50 kGy, respectively. After irradiation, the crystal structure of Agl₀.5(β-Al₂O₃)₀.5 was measured by X-ray diffraction. The conductivity of Agl₀.5(β-Al₂O₃)₀.5 was measured by LCR-metre at the frequency between 0.1 Hz until 100 kHz, while the hardness value was used by Vickers. The result from X-ray diffraction show that the structure of Agl₀.5(Al₂O₃)₀.5 is correspond with phase of γ-Agl, with the parameter is 6.52 Angstrom. The conductivities value of Agl₀.5(β-Al₂O₃)₀.5 before irradiation is between 0.11 x 10^-5 S/cm to 0.13 x 10^-5 S/cm, and after irradiation is between 0.31 x 10^-6 S/cm to 0.61 x 10^-6 S/cm. (author)

[en] Materials of potassium iodide-Aluminum silicate ionic conductor have been prepared by powder metallurgy method. Potassium iodide (KI) powder with variation of 0.1; 0.3; 0.5 and 0.6 mole were mixed with aluminum silicate homogeneously and then compacted and heated at temperature 500^oC for 2 hours. Characterization of materials structure were done by X-ray diffraction, while ionic conductivity were measured by LCR-meter with frequency 10^-1 Hz to 10⁵ Hz from room temperature up to 200^oC. Result of measurement showed the materials of ionic conductor was a composite of solid ionic conductor consisting of KI and aluminum silicate structure. The highest ionic conductivity was in order of 10^-3 S/cm for material consisting of 0.6 mole KI, at room temperature. (author)

[en] Beginning in 1994, a total of 3 (three) workshops ('The Utilization of Research Reactors-Neutron Scattering') have been held yearly in Jakarta. Back in December 1994, a joint research collaboration on the subject of superionic conductors between PNRI and BATAN was proposed and approved by the steering committee. The two principal scientists were V.S. Calix (PNRI) and AK Jahja (BATAN). The general arrangement was that PNRI is responsible for the sample preparation and the preliminary studies on the samples' physical properties (e.g., x-ray studies, DSC thermal measurements and frequency -dependent resistivity studies), whereas BATAN is responsible for structural studies using HRPD neutron diffraction measurements. For the period of December 1994 - December 1995, the superionic samples were the single phase β'-alumina and the double phase β,β-alumina (K_1+xFe₁₁O₁₇). Neutron diffraction measurements were supposed to be taken at room- and elevated temperatures. For the period of November 1996 - November 1997, new compounds have been proposed, in this case it is the non-stoichiometric Cu-based Rubidium Copper Iodide Chloride compounds, again the distribution of responsibility/workload stays the same as previously agreed to by BATAN and PNRI. The full report and results of this cooperation is presented. Activities covered so far at both laboratories are outlined. Although the high temperature neutron scattering measurements have not been completed, a further cooperation involving the preparation and neutron scattering measurements of materials in thin-film and single crystalline morphology is proposed. (author)

[en] Measurement of ionic materials conductivity as a function of temperature can be done if a special furnace is available. In order to support the research, an experiment was carried out to obtain a specific material for the heating element holder which can be used at high temperature, widely available in the local market and easily processed by casting method. At this experiment some materials such as clay, gibsum compound, grey and white cement have been tested. The test result indicate that the best material to be used as an holder of nickel wire heating element is grey cement. Heating system controlled by TZ4M-14S temperature controller, have been tested from room temperature to 450^oC with ± 0.5^oC in accuracy and it can be used with maximum temperature of 700^oC. (author)

[en] Materials of LiBr silicate aluminum ionic conductor have been prepared by powder metallurgy method in which 0.5 mole of LiBr powder is mixed with about 0.5 mole silicate aluminum in liquid medium of aquadest. After mixing and homogenization, the samples are dried, compacted and heated at 600 °C for 1 hour. Characterization of materials structure was carried out by X-Ray diffraction, ionic conductivity was measured by LCR meter with frequency range of 10"-"1 to 10"5 Hz at room temperature. Results of measurement show the (LiBr)_0_._5(AlSiO)_0_._5 conductor has the structure of both LiBr and of silicate aluminum. (LiBr)_0_._5(AlSiO)_0_._5 has the highest ionic conductivity in the order of 10"-"3 S.cm"-"1 while the ionic conductivity of LiBr is found to be about 10"-"4 S.cm"-"1 and that of silicate aluminum is about 10"-"6 S.cm"-"1, all measured at room temperature. (author)

[en] BaFe₁₂O₁₉ magnetic materials with high coercivity has been successfully synthesized by chemical co-precipitation method. The purpose of this research is to obtain BaFe₁₂O₁₉ magnetic materials that have high magnetic properties with coprecipitation method, without modification and surfactant application. BaFe₁₂O₁₉ heksaferit precursors were obtained from the mixture of Fe(NO₃)₃.9H₂O and Ba(NO₃)₂.6H₂O solution with a mole ratio of Fe³⁺/Ba²⁺ was 7.4. Co-precipitation process of BaFe₁₂O₁₉ take place in the temperature of 50°C using 1M of NaOH, to reach a solution of pH = 12. The result showed that BaFe₁₂O₁₉ precursor formed heksaferit barium phase system, BaFe₁₂O₁₉, after sintering 900 and 1000°C. High intrinsic coercivity value, H_ci = 5.0 kOe, was obtained from BaFe₁₂O₁₉ precursors after sintering 900°C for 5 hours. The value of H_ci obtained from this research are much higher when compared with the H_ci value of commercial products that only 1.7 kOe. This high H_ci values are closely related to the crystallite size of very smooth BaFe₁₂O₁₉. This is supported by Transmission Electron Microscope (TEM) observations, which showed that produced BaFe₁₂O₁₉ has a particle size approximately 200 nm. From this research, it can be obtained high coercivity BaFe₁₂O₁₉ magnetic that can be applied as a energy generating component. (author)