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All Journal Jurnal Fisika Unand Jurnal Riset Kimia
Amir, Firmanul Qadri
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Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Struktur dan Sifat Dielektrik Senyawa Aurivillius CaBi3LaTi4O15 yang Disintesis dengan Teknik Hidrotermal Zulhadjri, Zulhadjri; Amir, Firmanul Qadri; Mahmud, Marsal; Septiani, Upita; Arief, Syukri
Jurnal Riset Kimia Vol 11, No 1 (2020): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i1.343

Abstract

Synthesis of four-layer Aurivillius CaBi3LaTi4O15 has been successfully carried out by hydrothermal technique using NaOH 4 M as mineralizer. The reaction was carried out at 220 °C for 72 h. Crystal structure, morphology, and dielectric properties were analyzed in this study. X-ray diffraction confirmed that the single-phase product was successfully obtained. The refinement result shows the product has orthorhombic crystal structure with space group A21am. The morphology analyzed using SEM shows plate-like grains are observed, which is characteristic of Aurivillius phase. Dielectric curves show peaks at 585 °C which indicate ferroelectric transition temperature.
Pengaruh Suhu Terhadap pH Larutan Penyangga Dalam Optimasi Kondisi Penyimpanan di Laboratorium: Studi Parameter Uji Akreditasi ISO 17025-2107 Novita, Marlia; Amir, Firmanul Qadri; Salmiati, Salmiati; Putri, Yulia Eka
Jurnal Fisika Unand ##issue.vol## 15 ##issue.no## 3 (2026)
Publisher : Universitas Andalas

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Abstract

Buffer solution have an essential role in ensuring pH measurement accuracy, particularly in laboratories implementing ISO 17025-2017 standards. Temperature fluctuation can cause pH changes that potentially reduce pH meter calibration accuracy and affect the quality of test results,. This study aims to analyze the effect of storage temperature on buffer pH stability and determine the optimal storage conditions,. An experimental design was employed with three storage temperature variations, namely cold (±13°C), room (±25°C), and high (±50°C), applied to pH 4, 7, and 10 buffer solutions,. Measurements were conducted every 24 hours for seven days using a digital pH meter. Data were statistically analyzed to identify significant changes and determine the optimal temperature. The results are expected to provide effective buffer storage recommendations, support chemical management in laboratories, and enhance testing reliability in accordance with ISO 17025:2017 standards.
Co-Authors Ida Ayu Putu Sri Widnyani Mahmud, Marsal Novita, Marlia Salmiati Salmiati, Salmiati Upita Septiani Yulia Eka Putri, Yulia Eka Zulhadjri Zulhadjri