Accepted Article This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/jace.15061 This article is protected by copyright. All rights reserved. MR ADITYA JAIN (Orcid ID : 0000-0003-2509-4608) DR. AMRISH PANWAR (Orcid ID : 0000-0001-5076-8593) Article type : Article Corresponding author mail id: panwaramar@gmail.com Enhanced structural, dielectric, ferroelectric and piezoelectric properties of (1-x)Ba 0.9 Sr 0.1 TiO 3 – (x)Ba 0.7 Ca 0.3 TiO 3 ceramics derived using mechano- chemical activation technique Aditya Jain a , Amrish K. Panwar *,a , Rakesh Saroha a , A. K. Jha b a Department of Applied Physics, Delhi Technological University (Formerly Delhi College of Engineering), Bawana Road, Delhi-110042, India. b Department of Applied Science, A.I.A.C.T.R. Geeta Colony, Delhi-110031, India. Abstract The effect of Ba 0.7 Ca 0.3 TiO 3 (BCT) substitution on the structural, dielectric, ferroelectric and piezoelectric properties of mechano-chemically synthesized lead-free (1-x)Ba 0.9 Sr 0.1 TiO 3 -(x)Ba 0.7 Ca 0.3 TiO 3 (x = 0.0, 0.10, 0.20, 0.35 and 0.50) ceramics have been investigated. X-ray diffraction patterns confirms the formation of tetragonal phase with P4mm space group. The results indicate a strong influence of BCT substitution on the structural and electrical properties of Ba 0.9 Sr 0.1 TiO 3 (BST) ceramic. BST-BCT ceramic for x = 0.35 have shown high dielectric constant ε m ~ 21800, high remnant polarization P r ~ 10.16 μC/cm 2 , large piezoelectric charge constant D 33 ~ 293 pC/N, large piezoelectric voltage constant g 33 ~ 5.80 mV.m/N and highest dielectric breakdown strength E bd ~ 224 kV/cm among the five synthesized samples. The correlation between structural, * Corresponding author: Amrish. K. Panwar, E-mail: panwaramar@gmail.com, Tel: +91-9891778307 (Mobile).