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"ABSTRAKMaterial perovskite menjadi menarik untuk diteliti karena sifat fisis, relasi kompleks antar sifatnya, dan potensi dalam aplikasi elektronik. LaFeO3 adalah salah satu jenis material perovskite orthofferite yang menarik perhatian karena potensi aplikasinya material elektroda pada SOFCs dan sensor dan relasi kompleks antara sifat listrik dan magnetnya. Beberapa penelitian sebelumnya memperlihatkan bahwa doping pada LaFeO3 mempengaruhi sifat-sifatnya, khususnya sifat struktur dan listriknya seperti kestabilan struktur, kenaikan dielektrik konstan, penurunan loss dielektrik, kenaikan konduktivitas, dll. Pada penelitian ini, kita fokus pada pengaruh substitusi Mo pada Fe-site pada LaFeO3 terhadap sifat struktur, vibrasi, dan listrik. Proses sintesis material akan dilakukan dengan metode solgel-sintering menghasilkan nanopowder dan nanocrystal bulk . Sifat struktur dikarakterisasi dengan X-ray Diffraction XRD . Hamburan Raman dikarakterisasi dengan spektroskopi raman sebagai fungsi temperatur pada rentangan 300K ndash; 500K untuk menjelaskan tentang sifat struktur, paramter struktur, dan transisi magnetik. Energi gap diperoleh dari karakterisasi spektroskopi elipsometri. Sifat listrik konduktivitas dan dielektrik dikarakterisasi menggunakan RLC-Meter dan dianalisis menggunakan metode spektroskopi impedansi dan parallel plate method. Sifat termal dikarakterisasi menggunakan differential scanning calorimetry DSC untuk mengidentifikasi keberadaan transisi fasa yang dikonfirmasi oleh hasil karakterisasi raman.Keyword : Perovskite, LaFeO3, sifat fisika, transisi fasa.

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ABSTRACTPerovskite materials have been intensively studied and also attracting a great interests due to of their physical properties, complex correlation in properties, and potential electronics applications. LaFeO3 is one of orthoferrite perovskite material which paid attention in decades because its potential application and complex correlation between electrical and magnetic properties. Several researches shows that doping on LaFeO3 has led to physical properties, especially structural and electrical properties such as stable structure, higher dielectric constant, low dielectric loss, higher conductivity, etc. In this study, we focus on Mo substitution in Fe site of LaFeO3 and studing about structural, vibrational, and electrical properties as comparative study. The synthesize have been done by sol gel sintering method resulting nanoparticle powder and nanocrystalline bulk samples. The structural properties is checked by XRD. The vibrational properties is recorded by Raman scattering measurement as a function of temperature in the temperature range of 300K ndash 800K. The gap energy was obtain by ellipsometry spectroscopy. The electrical properties conductivity and dielectric were characterized by RLC Meter and analyzed by complex impedance spectroscopy and parallel plate method. Thermal properties was characterized by DSC to identify the phase transition and consistent with raman results. Keyword Perovskite, LaFeO3, physical properties, phase transition"

"This textbook, now in its third edition, provides a formative introduction to the structure of matter that will serve as a sound basis for students proceeding to more complex courses, thus bridging the gap between elementary physics and topics pertaining to research activities. The focus is deliberately limited to key concepts of atoms, molecules and solids, examining the basic structural aspects without paying detailed attention to the related properties. For many topics the aim has been to start from the beginning and to guide the reader to the threshold of advanced research. This edition includes four new chapters dealing with relevant phases of solid matter (magnetic, electric and superconductive) and the related phase transitions. The book is based on a mixture of theory and solved problems that are integrated into the formal presentation of the arguments. Readers will find it invaluable in enabling them to acquire basic knowledge in the wide and wonderful field of condensed matter and to understand how phenomenological properties originate from the microscopic, quantum features of nature."

"This handbook covers all areas of nonlocal continuum mechanics including theoretical aspects,computational procedures, and experimental advances. The multidisciplinary scope of articles that comprise this reference are written by internationally recognized experts in the field and stand as the most-up-to-date, established knowledge base on using nonlocal continuum mechanics to characterize material behavior for advanced composites and nano-materials, as well as for engineering scale structures. The handbook is at once a comprehensive reference for academic researchers and engineers in industry concerned with nonlocal continuum mechanics for materials and structures as well as a supplement for graduate courses on a range of topics."

"This handbook covers all areas of nonlocal continuum mechanics including theoretical aspects,computational procedures, and experimental advances. The multidisciplinary scope of articles that comprise this reference are written by internationally recognized experts in the field and stand as the most-up-to-date, established knowledge base on using nonlocal continuum mechanics to characterize material behavior for advanced composites and nano-materials, as well as for engineering scale structures. The handbook is at once a comprehensive reference for academic researchers and engineers in industry concerned with nonlocal continuum mechanics for materials and structures as well as a supplement for graduate courses on a range of topics."